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1
Teng, Zheng, Joseph A. Smithson, Ping Zhou und John J. Sansalone. „Geospatial Distribution of Metal Elements in Transportation Land Use Surficial Soils“. Transportation Research Record: Journal of the Transportation Research Board 1797, Nr. 1 (Januar 2002): 11–22. http://dx.doi.org/10.3141/1797-02.
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Highway traffic generates heavy metals and particulate matter through various vehicular and tire-pavement abrasion mechanisms. These abraded materials are deposited, they accumulate, and they are transported by storm water. Soils subject to years of such loading can serve as a sink and a potential source for heavy metals. The results of geotechnical analyses, heavy metal distributions, drainage influences, and correlations to geotechnical indices for surficial (0 to 15 cm) glacial till samples recovered from two transects along a heavily traveled urban interstate highway were compared with a control site subjected to only urban atmospheric deposition. This investigation indicated, for this site, that heavy metal accretion in the surficial soils is a function of depth, surface drainage patterns, distance from the pavement edge, and soil indices. Particulate-bound heavy metal deposition and accretion or export were a function of surface flow conditions such as velocity, flow depth, and surface cover. Results indicated that heavy metal accretion rapidly decreases as a function of distance from the traveled roadway. Along the longitudinal transect, correlations between heavy metals and soil organic content were statistically significant, particularly for copper. Along the transverse transect, correlations between soil plasticity, organic content, and heavy metals were statistically significant. Although there is little control of traffic levels and past accretion, indices such as soil organic content and plasticity index, as well as pavement runoff surface drainage patterns, can provide information about whether highway soils might act as a sink or source of heavy metals and, consequently, if best management practices may be justified.
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Trethowan, Liam A., Benjamin Blonder, Endang Kintamani, Deden Girmansyah, Timothy M. A. Utteridge und Francis Q. Brearley. „Metal‐rich soils increase tropical tree stoichiometric distinctiveness“. Plant and Soil 461, Nr. 1-2 (31.01.2021): 579–89. http://dx.doi.org/10.1007/s11104-021-04839-7.
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Abstract Background and aims Ultramafic soils have high metal concentrations, offering a key opportunity to understand if such metals are strong predictors of leaf stoichiometry. This is particularly relevant for tropical forests where large knowledge gaps exist. Methods On the tropical island of Sulawesi, Indonesia, we sampled forests on sand, limestone, mafic and ultramafic soils that present a range of soil metal concentrations. We asked how variation in 12 soil elements (metals and macronutrients) influenced leaf stoichiometry and whether stoichiometric distinctiveness (the average difference between a species and all others in a multivariate space, the axes of which are the concentrations of each leaf element) is influenced by increasing soil metal concentrations. Results Positive correlations between corresponding elements in soils and leaves were only found for Ca and P. Noticeably, soil Cr had a negative effect upon leaf P. Whilst most species had low stoichiometric distinctiveness, some species had greater distinctiveness on stressful metal-rich ultramafic soils, generally caused by the accumulation of Al, Co, Cr or Ni. Conclusions Our observation of increased stoichiometric distinctiveness in tropical forests on ultramafic soils indicates greater niche differentiation, and contrasts with the assumption that stressful environments remove species with extreme phenotypes.
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Yudina, Elena Valerievna. „Methodological approaches to the assessment of heavy metal contamination in urban ecosystems soils“. Samara Journal of Science 6, Nr. 3 (01.09.2017): 56–63. http://dx.doi.org/10.17816/snv201763110.
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The paper presents the assessment of heavy metal pollution of Abakan soils, the main source of which is motor transport. The pollution assessment of the upper horizons soils located near four main highways of the city was conducted under established standards. The maximum concentration of elements was recorded in the area with very high traffic, which confirms the importance of the role of motor transport as the main source of pollutants. When calculating the total pollution index (Zc) all highways were in a dangerous category. A similar indicator calculated on the basis of the data content in the soil-forming rock, allowed us to determine the degree of pollution as moderately hazardous. Analysis of heavy metals content in soil profiles has allowed to establish in the upper soil horizons, a significant excess of gross and mobile forms of all elements at sites with very high and high degree of traffic load, which indicates intense аerogenic intake of pollutants. Determined the proportion of elements of anthropogenic origin and the fact of the uneven distribution of heavy metals in the soil profile and their concentration in different geochemical barriers. When determining causal relationships between heavy metal content and separate soil characteristics we have found a direct dependence on the following parameters: pH, humus, cation exchange capacity, carbon dioxide, carbonates, particle size distribution, and in some cases we can talk about complex influence of soil properties on the concentration of elements. Assessment of heavy metal contamination in urban ecosystems soils, using the data content of elements in soil-forming rock with the use of the profile approach is the most objective.
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Atiaga, Oliva, Jenny Ruales, Luís Miguel Nunes und Xosé Luis Otero. „Toxic Elements in Soil and Rice in Ecuador“. Agronomy 11, Nr. 8 (11.08.2021): 1594. http://dx.doi.org/10.3390/agronomy11081594.
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The concentration of trace toxic metals (Cr, Zn, As, Pb, Cd, Cu, and Ni) in soil and rice plants, including the stems, leaves, and grain, from the main rice-producing provinces in Ecuador, was determined. Additionally, the soils were analyzed to determine their properties, composition, total content, bioavailable fraction, and geochemical fractions of toxic elements. Approximately 30% of soil samples in the case of Cr and Cu and 10% of samples in the case of Ni exceeded the legal thresholds for Ecuador. Moreover, for Cr and Cu, approximately 4% and 13% of samples, respectively, exceeded the threshold value of 100 mg kg−1 proposed for these two elements in several international regulations. Concentrations of As, Pb, and Cd in the soils were below the threshold values established both by Ecuadorian laws and by other countries. The concentrations of metals in rice plants did not correlate linearly with the total metal concentrations in the soil, nor with their bioavailability. However, the bioconcentration factors for As, Cd, Cu, Ni, and Zn could be predicted from bioavailability by a power law with exponents ranging from −0.724 to −1.625, which is typical of accumulator plants, where trace metal homeostasis plays an important role.
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Makhinova, Aleksandra, Aleksey Makhinov und Viktoriya Kuptsova. „Migrational activity of elements and chemical soil pollution during deposit exploitation in Amur River region and Okhotsk Sea region“. E3S Web of Conferences 56 (2018): 04008. http://dx.doi.org/10.1051/e3sconf/20185604008.
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We studied mechanisms of geochemical soil systems formation. This work provides geochemical characteristics of soils under the influence of mining enterprises. It also shows the mechanisms of sewage water enrichment by heavy metals during sulphidic deposit exploitation and their interaction with soil substance. We also describe migrational activity of elements and the conditions of their concentration in the soil volume. It is shown that migrational activity of elements depends on both their chemical nature and the level of aggressive fractions of humus acids and background-forming elements (Fe and Mn) content. The level of heavy metal concentration in soils formed in the area of influence of deposits showed to be exceeded. We suggest new approach to complex evaluation of element reallocation mechanisms in soils.
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Marchi, Giuliano, Luiz Roberto Guimarães Guilherme und Andrew C. Chang. „Plant availability of trace elements in sewage sludge-treated soils: methodology¹“. Revista Brasileira de Ciência do Solo 35, Nr. 4 (August 2011): 1453–60. http://dx.doi.org/10.1590/s0100-06832011000400039.
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Synthetic root exudates were formulated based on the organic acid composition of root exudates derived from the rhizosphere of aseptically grown corn plants, pH of the rhizosphere, and the background chemical matrices of the soil solutions. The synthetic root exudates, which mimic the chemical conditions of the rhizosphere environment where soil-borne metals are dissolved and absorbed by plants, were used to extract metals from sewage-sludge treated soils 16 successive times. The concentrations of Zn, Cd, Ni, Cr, and Cu of the sludge-treated soil were 71.74, 0.21, 15.90, 58.12, and 37.44 mg kg-1, respectively. The composition of synthetic root exudates consisted of acetic, butyric, glutaric, lactic, maleic, propionic, pyruvic, succinic, tartaric, and valeric acids. The organic acid mixtures had concentrations of 0.05 and 0.1 mol L-1 -COOH. The trace elements removed by successive extractions may be considered representative for the availability of these metals to plants in these soils. The chemical speciation of the metals in the liquid phase was calculated; results showed that metals in sludge-treated soils were dissolved and formed soluble complexes with the different organic acid-based root exudates. The most reactive organic acid ligands were lactate, maleate, tartarate, and acetate. The inorganic ligands of chloride and sulfate played insignificant roles in metal dissolution. Except for Cd, free ions did not represent an important chemical species of the metals in the soil rhizosphere. As different metals formed soluble complexes with different ligands in the rhizosphere, no extractor, based on a single reagent would be able to recover all of the potentially plant-available metals from soils; the root exudate-derived organic acid mixtures tested in this study may be better suited to recover potentially plant-available metals from soils than the conventional extractors.
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Nyika, Joan Mwihaki, Ednah Kwamboka Onyari, Megersa Olumana Dinka und Shivani Bhardwaj Mishra. „Heavy Metal Pollution and Mobility in Soils within a Landfill Vicinity: A South African Case study“. Oriental Journal Of Chemistry 35, Nr. 4 (19.08.2019): 1286–96. http://dx.doi.org/10.13005/ojc/350406.
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Heavy metal contamination in soils results from anthropogenic and lithologic factors and is a potential hazard to land and water resources. Sources of such pollution include landfills, domestic sewage, agricultural fertilisers and industries. In this work, soils from Roundhill landfill vicinity in South Africa were sampled and analyzed to determine the concentrations of particular heavy metals, namely As, Co, Cr, Cu, Fe, Mn, Ni, Pb, V and Zn. The main objectives of this work were to: quantify the concentration levels of heavy metals in the soil; determine the mobility of the heavy metals in the soil; and establish their origins and interrelationships. The soils were collected at various distances and depths from the landfill facility. The concentrations of heavy metals in the soil samples were analysed by ICP-MS and statistical analysis was carried out to establish their relationships and sources. From the analysis, some elements including Cr, Mn, Cu and Ni had measured concentrations beyond the threshold limits in most sampling sites irrespective of their distance and depth from the landfill vicinity. Conversely, some elements were observed to be immobile and had higher concentrations on the top soils closer to the landfill, such as As, Pb, Zn, Co and V. Iron (Fe) had high concentrations in all the sampling sites due to its natural occurrence in the parent rocks. In conclusion, the potential of soil quality deterioration due to heavy metal pollution in a landfill vicinity was observed. Furthermore, all heavy metals observed showed positive correlation to each other except for As and Co, indicating same origin.
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Hooda, P. S., und B. J. Alloway. „The effect of liming on heavy metal concentrations in wheat, carrots and spinach grown on previously sludge-applied soils“. Journal of Agricultural Science 127, Nr. 3 (November 1996): 289–94. http://dx.doi.org/10.1017/s0021859600078448.
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SUMMARYLiming is often recommended to minimize the plant uptake of potentially toxic elements from sludgeamended soils. In outdoor experiments conducted during 1989–91 in a rural location, near Brentwood (UK), wheat, carrots and spinach were grown on soils from a wide range of sites previously amended with heavy applications of sewage sludge. The objective of these studies was to examine the effect of liming on the accumulation of sludge-borne metals in the crop plants. The results showed that liming the soils to pH 7 prior to sowing significantly reduced metal concentrations in carrots and spinach, although the reduction appeared to be greater for Cd, Ni and Zn than for Cu and Pb. The wheat crop was grown on soils which had been limed 2 years previously, and the average pH of these soils was 6·5 compared to a pH value of 5·95 in the unlimed soils. This comparatively small pH difference between limed and unlimed soils (6·50–5·95) generally had little influence on metal contents in wheat.These results suggested that maintaining the soil at pH 7 is better than pH 6·5 for minimizing the accumulation of potentially toxic elements from soils which have received relatively high levels of sludge application over many years. The data for winter wheat suggested either that metal uptake into the grain was not sensitive to differences in soil pH or that a relatively small residual effect of past liming was not high enough to reduce metal uptake.
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Yang, Rong, Zeyu Du und Junqia Kong. „Decadal changes and ecological risk assessment of trace and heavy metal elements in soils of a desert oasis, Linze County, China“. Soil Research 57, Nr. 2 (2019): 178. http://dx.doi.org/10.1071/sr18245.
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This study assesses decadal changes (2005–2015) in the trace and heavy metal element contents of soils from four land use types at a desert oasis and also determines associated ecological and health risks. Concentrations of boron, molybdenum, manganese, zinc, copper, cadmium, lead, and mercury increased significantly over the decade. Farmland ecosystems had higher concentrations of soil trace and heavy metal elements than natural ecosystems, but intercropping with alfalfa tended to reduce concentrations. The environmental pollution assessment indicated that soils were moderately affected by human activities, particularly in farmland ecosystems. The potential degree of ecological risk from all elements was moderate, and in relation to land use this risk decreased in the following order: long-term cultivated farmland>newly reclaimed farmlands with monoculture>newly reclaimed farmlands with intercropping>natural desert grassland. Eight soil heavy metals posed potential non-carcinogenic risks, and dermal contact was the major exposure pathway; however, the carcinogenic risk level from soil was acceptable. These results suggest that agricultural activities increased the concentrations of certain soil trace and heavy metal elements and that adopting appropriate farmland management, such as intercropping with alfalfa, limited this increasing trend.
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Lu, SiHeng, Chang Pan, YuJuan Jin, Xiang Wang, Xinlai Wei und ZhiMin Yu. „EVALUATION OF HEAVY METALS AROUND THE MINING OF DECORATIVE STONE ORE IN SUSONG COUNTY LIAOHE RIVER“. Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 3 (15.06.2017): 192. http://dx.doi.org/10.17770/etr2017vol3.2620.
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In order to study the pollution of heavy metals around Liaohe Fender stone mine in Susong County, the soils at six points and the sediment at four points were selected. The effects of heavy metals Cu, Zn, Pb, Cd, Cr , Ni ,Hg and As were measured, the single factor index and the Nemero index method were used to evaluate the heavy metal elements in soil and sediment. The results showed that the values of heavy metal elements in the soil and sediment were less than 1 and the Pintegrated values were less than 0.85,the mine area was not polluted by heavy metals and belonged to the clean area within the grade Ⅰ.
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Qu, Guiwei, und Amarilis de Varennes. „Use of Hydrophilic Insoluble Polymers in the Restoration of Metal-Contaminated Soils“. Applied and Environmental Soil Science 2009 (2009): 1–8. http://dx.doi.org/10.1155/2009/790687.
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To develop cost-effective techniques that contribute to phytostabilization of severely metal-contaminated soils is a necessary task in environmental research. Hydrophilic insoluble polymers have been used for some time in diapers and other hygienic products and to increase the water-holding capacity of coarse-textured soils. These polymers contain groups, such as carboxyl groups, that are capable of forming bonds with metallic cations, thereby decreasing their bioavailability in soils. The use of polyacrylate polymers as soil amendments to restore metal-contaminated soils has been investigated in the Technical University of Lisbon since the late nineties. Plant growth and plant nutrients concentrations, extractable levels of metals in soil, and soil enzyme activities were used to monitor the improvement in soil quality following the application of these polymers. In contaminated soils, hydrophilic insoluble polymers can create microcosms that are rich in water and nutrients (counterions) but only contain small concentrations of toxic elements; the conditions of these microenvironments are favorable to roots and microorganisms. In this paper we described the most relevant information available about this topic.
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Chen, Song, Cancan Wu, Shenshen Hong und Qianqian Chen. „Assessment, Distribution and Regional Geochemical Baseline of Heavy Metals in Soils of Densely Populated Area: A Case Study“. International Journal of Environmental Research and Public Health 17, Nr. 7 (27.03.2020): 2269. http://dx.doi.org/10.3390/ijerph17072269.
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To understand the content, pollution, distribution and source and to establish a geochemical baseline of heavy metal elements in soil under the influence of high-density population, the concentrations of heavy metal elements Cr, Mn, Co, Ni, Cu, Zn, As, Cd, Hg, Pb and Fe were determined in 23 soil samples in Suzhou University, and geo-accumulation index, enrichment factor, principal component analysis, spatial analysis and regression analysis were completed. The results showed the following: The elements Cu and As were slightly polluted, while the other heavy metal elements were not. The elements Cd, Cu, Ni and As in soils were mainly caused by agricultural activities of chemical fertilizer, whereas the elements Zn and Hg were impacted by the chemicals and batteries. The heavy metal elements in the north were lower than in the south of the campus, as a whole. The enrichment of elements Cu, As and Cd was caused by the east–west river on the campus, and the enrichment of the elements Mn, Ni and Zn was induced by the reservoir. Biochemical experiments and vehicle parking influenced the spatial enrichment of Cr, Co and Pb, while domestic waste led to the spatial differentiation of Hg concentrations. The regression curve between heavy metal elements and Fe was established, and the background values of the heavy metals Cr, Mn, Co, Ni, Cu, Zn, As, Cd, Hg and Pb are 50.90, 489.37, 11.76, 37.74, 55.70, 58.22, 20.07, 0.09, 0.08 and 24.13 mg/kg, respectively.
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Kobza, J. „Soil and plant pollution by potentially toxic elements in Slovakia“. Plant, Soil and Environment 51, No. 6 (19.11.2011): 243–48. http://dx.doi.org/10.17221/3581-pse.
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The Problem of soil and plant pollution by heavy metals in Slovakia is evaluated in this study. The measured data on the main risk elements have been obtained from a soil-monitoring grid in Slovakia, which consists of 318 agricultural sites. Analytical procedures of Cd, Pb, Cr, Ni, Zn, Cu (extracted by 2 mol/l HNO<sub>3</sub> and by 0.05 mol/l EDTA) as well as the total content of the described elements including Hg have been used for soil samples. Also the plants collected at the same sampling sites were analysed for their Cd, Pb, Cr and Hg contents. On the basis of the obtained results it may be concluded that significant pollution was determined only on 0.4% of the total soil cover in Slovakia. The significant correlation was determined between the soil available heavy metal content (extracted by 0.05 mol/l EDTA) and plant content. Potentially toxic elements were accumulated in the plant biomass only on heavily polluted soils
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Antcibor, I., S. Zubrzycki, A. Eschenbach, L. Kutzbach, D. Bol'shiyanov und E. M. Pfeiffer. „Trace metal distribution in pristine permafrost-affected soils of the Lena River Delta and its Hinterland, Northern Siberia, Russia“. Biogeosciences Discussions 10, Nr. 2 (06.02.2013): 2205–44. http://dx.doi.org/10.5194/bgd-10-2205-2013.
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Abstract. Soils are an important compartment of ecosystems and have the ability to immobilize chemicals preventing their movement to other environment compartments. Predicted climatic changes together with other anthropogenic influences on Arctic terrestrial environments may affect biogeochemical processes enhancing leaching and migration of trace elements in permafrost-affected soils. This is especially important since the Arctic ecosystems are considered to be very sensitive to climatic changes as well as to chemical contamination. This study characterizes background levels of trace metals in permafrost-affected soils of the Lena River Delta and its hinterland in northern Siberia (73.5° N–69.5° N) representing a remote region far from evident anthropogenic trace metal sources. Investigations on total element contents of iron (Fe), arsenic (As), manganese (Mn), zinc (Zn), nickel (Ni), copper (Cu), lead (Pb), cadmium (Cd), cobalt (Co) and mercury (Hg) in different soil types developed in different geological parent materials have been carried out. The highest concentrations of the majority of the measured elements were observed in soils belonging to ice-rich permafrost sediments formed during the Pleistocene (ice-complex) in the Lena River Delta region. Correlation analyses of trace metal concentrations and soil chemical and physical properties at a Holocene estuarine terrace and two modern floodplain levels in the southern-central Lena River Delta (Samoylov Island) showed that the main factors controlling the trace metal distribution in these soils are organic matter content, soil texture and contents of iron and manganese-oxides. Principal Component Analysis (PCA) revealed that soil oxides play a significant role in trace metal distribution in both top and bottom horizons. Occurrence of organic matter contributes to Cd binding in top soils and Cu binding in bottom horizons. Observed ranges of the background concentrations of the majority of trace elements were similar to background levels reported for other pristine arctic areas and did not exceed mean global background concentrations examined for the continental crust as well as for the world's soils.
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Fadigas, Francisco Souza, Nelson Moura Brasil do Amaral Sobrinho, Lucia Helena Cunha dos Anjos und Nelson Mazur. „Background levels of some trace elements in weathered soils from the Brazilian Northern region“. Scientia Agricola 67, Nr. 1 (Februar 2010): 53–59. http://dx.doi.org/10.1590/s0103-90162010000100008.
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Soils formed from the Barreiras Group sediments, located mainly along the coast of Brazil Northern and Northeastern regions, generally present low concentrations of iron oxides and total organic carbon, high quantities of quartz in the sand fraction, and kaolinitic clay mineralogy. The objective of the present study was to quantify the pseudo total concentrations of Cd, Co, Cu, Cr, Mn, Ni, Zn and Fe in Xhantic Udox and Xhantic Udult soils derived from these sediments. The reference sites were covered by native vegetation and located in the States of Pará and Amapá, Brazil. Multiple linear regression analysis was applied to determine correlations between soil parameters and the levels of these metals. The best correlation was obtained between Fe, Mn, clay, and silt contents, and Cd, Co, Cu, Zn, Cr, Ni. A correlation between pH and these metal levels was not found. Clay and sand contents showed a negative inverse correlation with the metal levels,of same magnitude but with a different sign; this was the reason for excluding one of the parameters in the regression model. In general, the contents of the elements were lower than those found in soils formed from other parent materials. The Mn content was included in the model of multiple linear regression for Cd and Co, due to its association with these last metals. Silt level showed to have a significant influence in the equations for Cr and Co, which is attributed to the presence of clay minerals and Fe and Mn oxides in ferruginous and clay aggregates of silt size. The equations obtained in this paper, are useful to predict, in general terms, the amounts of those heavy metals in an unknown soil sample, if the soil material were not contaminated or affected by land usage. Thus, they may be applied to evaluate soil contamination by the studied heavy metals.
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Navarro-Pedreño, Jose, María Almendro-Candel, Ignacio Gómez Lucas, Manuel Jordán Vidal, Jaume Bech Borras und Antonis Zorpas. „Trace Metal Content and Availability of Essential Metals in Agricultural Soils of Alicante (Spain)“. Sustainability 10, Nr. 12 (01.12.2018): 4534. http://dx.doi.org/10.3390/su10124534.
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This article analysed the presence of trace metals (essential elements and pollutants) and soil properties in rural abandoned soils of a Mediterranean region. The soil properties determined were texture, pH, equivalent calcium carbonate, soil organic matter, availability of micronutrients (Fe, Mn, Cu, and Zn), and acid microwave digestion extraction to measure the trace metals considered as main pollutants (Cu, Zn, Cd, Cr, Ni, and Pb). Descriptive statistics and correlations were used to determine the relations among these parameters. pH, soil organic carbon (SOC), and clay were the main properties that controlled the availability of essential metals. pH was the main factor related to these metals in these calcareous soils. However, SOC, which can be incremented by adding organic fertilizers for soil rehabilitation as a sustainable practice, played an important role. Mean values of the metal composition in soils (Cu, Zn, Cd, Cr, Ni, and Pb) obtained in this study were similar to values reported for other areas in the Mediterranean basin.
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Cornu, Jean-Yves, und Laurence Denaix. „Prediction of Zinc and Cadmium Phytoavailability Within a Contaminated Agricultural Site using DGT“. Environmental Chemistry 3, Nr. 1 (2006): 61. http://dx.doi.org/10.1071/en05050.
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Environmental Context.In some agricultural areas, soils are contaminated by trace elements. This contamination of cultivated soils may constitute a serious problem for human health through the accumulation of metals in the edible parts of crops. In order to assess the risk for human health associated with metal contamination of soil, we need to develop simple tools like Diffusive Gradients in Thin Films (DGT) for predicting crop metal accumulation. The present study focuses on an agricultural site contaminated with fallout from industrial dust and reveals that DGT could be a predictive tool of zinc accumulation in lettuce. Abstract.Risk assessment of metal contamination in cultivated soils needs to address metal phytoavailability. The technique of diffusive gradients in thin films (DGT) has been shown to be a promising tool to assess metal phytoavailability in a wide range of soils. The present study has examined the ability of the DGT method to predict metal phytoavailability within a contaminated agricultural site. Lettuce (Lactuva sativa cv Appia) was grown in nine metal-contaminated soils differing mainly by their pH. Metal concentrations (Zn, Cd) in plant shoots were compared with total soil metal concentrations and free ion metal concentrations in soil pore waters, and effective concentrations, CE, measured by DGT. Plant Zn concentrations were highly related to CE, suggesting DGT can be a sensitive tool able to assess Zn phytoavailability within mildly contaminated agricultural soils. Plant Cd concentrations were less closely related to CE, signifying that processes other than Cd re-supply from the solid phase may occur during soil–plant transfer of Cd.
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Campos, Paloma, Heike Knicker, Rafael López und José María De la Rosa. „Application of Biochar Produced from Crop Residues on Trace Elements Contaminated Soils: Effects on Soil Properties, Enzymatic Activities and Brassica rapa Growth“. Agronomy 11, Nr. 7 (11.07.2021): 1394. http://dx.doi.org/10.3390/agronomy11071394.
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Soil pollution by trace elements is a huge problem around the globe. In addition, heavy metal immobilization and primary productivity are two soil ecosystem services of contemporary importance to society. The goal of this study was to evaluate the effects of using olive pit and rice husk biochars as soil amendments for the immobilization of trace elements and on plant development growing in heavy metals-polluted soils under greenhouse conditions. The application of high doses (5% and 10%) of biochar significantly increased pH, water holding capacity and total C content of the soils. Dehydrogenase activity in the moderately acidic soil was greater than in the acidic soil due to the high concentration of metals and high acidity of the latter. The application of biochar reduced the β–glucosidase activity. Furthermore, the concentrations of CaCl2-extractable heavy metals significantly decreased in biochar amended pots, indicating metal immobilization, which was consistent with the increase in soil pH. Distribution of trace elements in the different fractions was modified after 65 days of incubation, independently of the treatment. The Cu and Zn contents in the oxidizable fraction were reduced with incubation, whereas Cd and Zn in the residual fraction increased. The reduction of bioavailable concentrations and increments in the residual or more stable fractions indicated less risk for the organisms in the environment. All biochars addition significantly increased the root-to-shoot ratio compared to the control soil. Particularly, 10% of amendment increased this ratio in the greatest extent. The application of 10% w/w of rice husk biochar produced at 500 °C was the most effective in restoring soil functionality and reducing the availability of heavy metals in the polluted soils.
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Fontes, Mauricio Paulo Ferreira, und Luís Reynaldo Ferracciú Alleoni. „Electrochemical attributes and availability of nutrients, toxic elements, and heavy metals in tropical soils“. Scientia Agricola 63, Nr. 6 (Dezember 2006): 589–608. http://dx.doi.org/10.1590/s0103-90162006000600014.
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Electrochemical properties of soils are very important for the understanding of the physico-chemical phenomena which affect soil fertility and the availability of nutrients for plants. This review highlights the electrochemical properties of tropical soils, the behavior and the availability of nutrients, toxic elements and heavy metals in the soil, especially for soils with predominant variable charge minerals. Availability of the elements is related to ionic exchange, solution speciation, and electrostatic and specific adsorptive soil properties. Empirical and surface complexation models are briefly described, and some results of their application in tropical soils are presented. A better understanding of the role of the double diffuse layer of charges and CEC on nutrient cation availability for highly weathered soils is required, as well as a solid comprehension of surface complexation models, in order to improve the knowledge regarding the behavior of anions in soils. More studies have to be conducted to generate results that enable the use of chemical speciation concepts and calculation of several constants used in surface complexation models, especially for highly weathered soils from the humid tropics. There has to be a continuing development and use of computer softwares that have already incorporated the concepts of chemical speciation and adsorption models in the study of nutrients, toxic elements and heavy metal availability in the soil-plant system.
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MÄNTYLAHTI, V., und P. LAAKSO. „Arsenic and heavy metal concentrations in agricultural soils in South Savo province“. Agricultural and Food Science 11, Nr. 4 (04.01.2002): 285–300. http://dx.doi.org/10.23986/afsci.5731.
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Increasing concentrations of arsenic and heavy metals in agricultural soils are becoming a growing problem in industrialized countries. These harmful elements represent the basis of a range of problems in the food chain, and are a potential hazard for animal and human health. It is therefore important to gauge their absolute and relative concentrations in soils that are used for crop production. In this study the arsenic and heavy metal concentrations in 274 mineral soil samples and 38 organogenic soil samples taken from South Savo province in 2000 were determined using the aqua regia extraction technique. The soil samples were collected from 23 farms.The elements analyzed were arsenic, cadmium, chromium, copper, mercury, nickel, lead and zinc. The median concentrations in the mineral soils were:As 2.90 mg kg 1, Cd 0.084 mg kg 1, Cr 17.0 mg kg 1, Cu 13.0 mg kg 1, Hg 0.060 mg kg 1, Ni 5.4 mg kg 1, Pb 7.7 mg kg 1, Zn 36.5 mg kg 1. The corresponding values in the organogenic soils were:As 2.80 mg kg 1, Cd 0.265 mg kg 1, Cr 15.0 mg kg 1, Cu 29.0 mg kg 1, Hg 0.200 mg kg 1, Ni 5.9 mg kg 1, Pb 11.0 mg kg 1, Zn 25.5 mg kg 1. The results indicated that cadmium and mercury concentrations in the mineral and organogenic soils differed. Some of the arsenic, cadmium and mercury concentrations exceeded the normative values but did not exceed limit values. Most of the agricultural fields in South Savo province contained only small amounts of arsenic and heavy metals and could be classified as Clean Soil. A draft for the target values of arsenic and heavy metal concentrations in Clean Soil is presented.;
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Fedotov, Petr S., Olga B. Rogova, Rustam Kh Dzhenloda und Vasily K. Karandashev. „Metal–organic complexes as a major sink for rare earth elements in soils“. Environmental Chemistry 16, Nr. 5 (2019): 323. http://dx.doi.org/10.1071/en18275.
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Environmental contextThe role of rare earth elements in soil–plant systems remains unclear. We use continuous-flow extraction, designed to mimic natural conditions while minimising artefacts, to study in vitro chemical fractionation of rare earth elements in soil. The study reveals a predominant association of rare earth elements and metal-organic complexes independent of soil type and contamination, and thereby provides valuable insights into the behaviour of these elements in soil–plant systems. AbstractThe role of rare earth elements (REEs) in soil–plant systems has attracted increasing attention but still remains somewhat unclear. Along invivo studies on the uptake of REEs by plants, invitro chemical fractionation of REEs in soil according to their physicochemical mobility can offer additional insights into the behaviour of REEs. In the present work, the fractionation of REEs was studied with the example of background, aerially and hydrogenically contaminated soil samples using dynamic (continuous flow) extraction, which allows natural conditions to be mimicked and artefacts to be minimised. The eluents applied addressed exchangeable, specifically sorbed, bound to Mn oxides, bound to metal–organic complexes, and bound to amorphous and poorly ordered Fe/Al oxides fractions extractable by 0.05M Ca(NO3)2, 0.43M CH3COOH, 0.1M NH2OH·HCl, 0.1M K4P2O7 at pH 11, and 0.1M (NH4)2C2O4 at pH 3.2 respectively. The distribution of trace metals (such as Pb, Cu, Zn, Ni) between separated fractions varies with sample and is dependent on the type of contamination. However, for all samples, the recoveries of REEs by pyrophosphate are surprisingly high, up to 40–45% of their total concentrations in background and anthropogenically transformed floodplain soils. As compared to metal–organic complexes, the contents of REEs bound to Fe/Al oxides are fairly low, no more than 12%. REEs in other fractions may be taken into consideration only for aerially contaminated soil. Such a predominant association of REEs and metal–organic complexes (i.e. humic and fulvic compounds) independent of the type of soil has not been reported before.
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McLaughlin, M. J., R. E. Hamon, R. G. McLaren, T. W. Speir und S. L. Rogers. „Review: A bioavailability-based rationale for controlling metal and metalloid contamination of agricultural land in Australia and New Zealand“. Soil Research 38, Nr. 6 (2000): 1037. http://dx.doi.org/10.1071/sr99128.
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Metal pollution of agricultural land in Australia and New Zealand is less severe than that documented in many European countries, due to the lower density of urban developments and a lower level of industrialisation. However, Australia and New Zealand are highly dependent on plant production systems based on plant-microbial symbioses (e.g. Rhizobium, mycorrhizae) and other natural biogeochemical processes for maintaining nutrient status in soils that are generally low in nutrients and, in Australia, also low in organic matter. Data linking metal concentrations in soil to agricultural and ecological effects are sparse for Australia and New Zealand, and regulatory frameworks and guidelines to control metal contamination of soils rely heavily on data generated in countries of the northern hemisphere. Adoption of benchmark concentrations for metal contaminants from these countries has led to inappropriate levels being chosen for several elements. These problems could be avoided and metal contamination of soils could be more effectively controlled if instead of relying on total concentrations of metals in soil and soil amendments, regulations and guidelines considered the biologically active fractions. This review considers the advantages and disadvantages of a bioavailability-based approach to the control of metal contamination of soils and suggests improvements needed to avoid both over- and under-protective measures.
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Yang, Si Lin, Li Qiong Tang und De Qun Zhou. „Concentration and Distribution of Fe, Al, Mn and Cr in Soils“. Advanced Materials Research 864-867 (Dezember 2013): 1654–57. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.1654.
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The concentration and distribution of metal (Fe, Al, Mn and Cr) elements in agricultural and non-agricultural soils were investigated in upstream of the Pearl River, China. The result showed that total Fe, Al and Cr concentrations in agricultural soils were higher than those in non-agricultural soils, while total Mn concentrations in agricultural soils were lower than those in non-agricultural soils, indicating that agricultural input, such as water irrigation, fertilizer and pesticide application, may have led to the accumulation of Fe, Al and Cr in agricultural soils. Total concentrations of the metal elements in agricultural and non-agricultural soils were compared with the background values of Yunnan soil, the result showed Fe, Al, Mn and Cr were lower in both agricultural and non-agricultural soils in the study area.
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Liu, Y. Y., M. Ukita, T. Imai und T. Higuchi. „Recycling mineral nutrients to farmland via compost application“. Water Science and Technology 53, Nr. 2 (01.01.2006): 111–18. http://dx.doi.org/10.2166/wst.2006.044.
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Increased cultivation of farmland has resulted in nutrient deficiency and consequently fertility degradation of soils. This research examined the application of composted wastes in terms of the feasibility and effectiveness of recycling plant essential minerals. Minerals in composts (derived from sewage sludge, livestock excrement, and municipal solid wastes, respectively) and in amended soils were observed. Ca/Mg ratios in amended soils and the effect of compost applications (mineral nutrients and heavy metals) on plant uptake were also studied. Results showed that composts, especially those made from sewage sludge and livestock excrement, were richer in mineral nutrients but also contained more heavy metals than untreated soil. The increase in some elements and plant-growth-essential Ca/Mg ratios were found in amended farmlands, implying that compost applications have made up for the nutrient deficiency and have adjusted chemical conditions of the soil. The soil contamination from heavy metals was noticeable. However, some results showed that the large existence of mineral nutrients and heavy metals in soils has caused no significant increase in the plant uptake of elements. The controlled composting process and farmland uses are believed necessary for reducing the heavy metal accumulation in agricultural plants.
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Yang, Si Lin, und De Qun Zhou. „Concentration and Distribution of Metal Elements in Soils near a Upstream of the Pearl River, China“. Advanced Materials Research 864-867 (Dezember 2013): 2582–86. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.2582.
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The concentration and distribution of metal (Mg, K, Ca and Na) elements in agricultural and non-agricultural soils were investigated in upstream of the Pearl River, China. The result showed that total Mg, K, Ca and Na concentrations in agricultural soils were higher than those in non-agricultural soils, indicating that agricultural input, such as water irrigation, fertilizer and pesticide application, may have led to the accumulation of Mg, K, Ca and Na in agricultural soils. Total concentrations of the metal elements in agricultural and non-agricultural soils were compared with the background values of Yunnan soil, the result showed Mg, K and Na were lower in both agricultural and non-agricultural soils in the study area, while Ca was relatively higher, which were possibly due to Karsts geographic environment in the study area.
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Ma, Yamin, und Andrew W. Rate. „Metals adsorbed to charcoal are not identifiable by sequential extraction“. Environmental Chemistry 4, Nr. 1 (2007): 26. http://dx.doi.org/10.1071/en06051.
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Environmental context. Charcoal is widespread in soils and may be a major component of soil organic matter. Trace metal ions in soils are predominantly associated with solid phase materials, including charcoal, and the identity of the solid phase and the mechanisms of association influence the geochemical behaviour of metals. Metals associated with soil mineral phases are estimated using techniques such as selective sequential extraction, and the sorption reactions of metal ions are well understood. Much less is known about the associations of trace metals with natural charcoal, and metals associated with charcoal in soils are likely to be misidentified in sequential extraction procedures. Abstract. Given that up to 50% of the soil carbon store can consist of charcoal, it is possible that trace elements can become immobilised through their interaction with natural charcoal. Hence, natural charcoal may be a significant sink that has yet to be accounted for in trace element biogeochemical cycles. Testing this hypothesis becomes problematic considering the typically small size (<53 µm) of charcoal particles that occur naturally in Australian soils, making isolation and analysis of natural soil charcoal difficult. Therefore, in this study, we test the robustness of a typical sequential extraction technique by applying it to naturally occurring charcoal that had been spiked with five different concentrations of metal ions (Al3+, Cr3+, Cu2+, Ni2+, Zn2+, Cd2+, Ag+, Pb2+). The method was then applied to contrasting soils mixed with this spiked charcoal. The sequential extraction scheme consisted of the following five extractions the in order: (1) sodium acetate (targeting the adsorbed-exchangeable-carbonate fraction), (2) sodium pyrophosphate (organic fraction), (3) ammonium oxalate (amorphous iron/manganese oxides), (4) hydroxylamine hydrochloride (crystalline iron/manganese oxides) and (5) residual (aqua regia digest). The majority of metals added to the charcoal were extracted in the fractions targeting both the amorphous and crystalline iron and manganese oxides, at low additions of metal ions. At higher additions of metals, the metals were mostly extracted from charcoal in the adsorbed-exchangeable-carbonate fraction. When the spiked charcoal was added to soils, a trend similar to the charcoal-only experiment was observed in the sequential extraction data. Higher concentrations of metals (compared with the control) were extracted for the charcoal-amended soils, in the same fractions as in the charcoal-only extractions. Since the concentration of metals extracted in the various extractants changed with increasing metal loads on charcoal, sequential extractions cannot be used to identify the contribution of metals from the charcoal pool. Therefore, a potentially large pool of trace elements could be misrepresented when sequential extraction techniques are applied, particularly for soils in which there is a large concentration of charcoal. Hence, there is still a large gap in knowledge with regard to the significance of charcoal in ‘real’ soils, particularly with respect to the role of charcoal as a trace element sink.
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Tang, Mei Zhen, Min Yuan, Jian Li Ma, Jun Feng Chen und Hai Li Fu. „Studies on Soil Enzymatic Activities in Areas around Coal Mine“. Advanced Materials Research 518-523 (Mai 2012): 1986–93. http://dx.doi.org/10.4028/www.scientific.net/amr.518-523.1986.
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Soil enzymatic activities such as urease and invertase, were determined in areas polluted by Nesslers reagent colorimentric method and Mo-Phosphate colorimentric method in Yu Long coal mine, Shandong Province. The index of heavy metal pollution and the relationship between the activities of soil enzymes were analyzed. The results showed that the contents of heavy metals in contaminated soils were higher than those in unpolluted soils and the enzyme activities were decreased significantly with increasing contamination. The results of multivariate regression model test indicated that the elements of soil heavy metals have different influence on the soil enzymatic activities. It is feasible to use this index as a primary biochemical parameter to evaluate compound heavy metals pollution.
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Sheppard, S. C. (Steve). „Assessment of long-term fate of metals in soils: Inferences from analogues“. Canadian Journal of Soil Science 85, Nr. 1 (01.02.2005): 1–18. http://dx.doi.org/10.4141/s04-014.
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The assessment of the health and environmental impacts of metal contamination in soils is complicated, and in different ways than is the assessment of many other contaminants. One of the foremost problems is that the metals are often relatively immobile, so that it is necessary to verify predictions of mobility and impact far into the future. One approach is to seek analogue information: information from studies that may not have set out to measure attributes related to metal behaviour, but that none the less provide useful insights. One example would be the information on the mobility of natural clays and pedogenic metals such as iron and aluminum in soils. It is well accepted that clay particles will move downward in soils; what is less commonly inferred is that any contaminants associated with the clays will also move downward. For mobility of some metals, this may be a dominant process. Similarly, bioturbation has proven to markedly outpace leaching for many metals. This paper considers analogues related to cesium from bomb-fallout and Chernobyl, other natural radionuclide inputs to the soil, soil pedogenesis, pollen and non-metal industrialage inputs, ancient metal works, and soil fertility management. Related to biological transfers and toxicity, it considers analogy among elements an d among biota, and analogy to ecotoxicology of metals to freshwater biota. Where possible, limiting values for parameters of assessment models have been derived. Key words: Terrestrial, leaching, mobility, ecotoxicity, assessment
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Dong, Hongmei, Jingbo Zhao und Mengping Xie. „Heavy Metal Concentrations in Orchard Soils with Different Cultivation Durations and Their Potential Ecological Risks in Shaanxi Province, Northwest China“. Sustainability 13, Nr. 9 (23.04.2021): 4741. http://dx.doi.org/10.3390/su13094741.
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The heavy metal pollution of soils, resulting from long-term fertilizing activity, is becoming serious in many countries, endangering ecological safety and human health. This study employed inductively coupled plasma-mass spectrometry (ICP-MS) to investigate concentrations of eight heavy metal elements (Cd, Hg, As, Pb, Cr, Cu, Ni, and Zn) in five apple orchard soil profiles after different cultivation durations, one modern intercropping farmland soil profile, and one natural soil profile from Baishui County, in Shaanxi Province, Northwest China. The potential risk associated with the presence of heavy metals in the soils was assessed by the single-factor pollution index (Pi), Nemerow comprehensive index (NCI), and potential ecological risk index (RI). Results showed that the average concentrations of Cr, Ni, As, Pb, and Hg in the farmland soil were higher than those in the apple orchard soils. The average concentrations of Ni, Cu, As, and Hg in the apple orchard soils reached the highest after 25 years of cultivation. The results imply that concentrations of heavy metals will increase with increasing cultivation time. The farmland soil had the highest NCIs, while the NCIs of the apple orchard soils also increased with cultivation time. Compared with the quality standards of pollution-free orchards and green food production areas, all Pis and NCIs were less than 1 and 0.7, respectively, indicating that the soils were in healthy condition. The RI results also suggest that the soils have a low ecological risk (RI < 150). Although the potential ecological risk is currently low, predicting and reducing heavy metal input should be considered.
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Gonçalves, Deyvison Andrey Medrado, Gilson Sergio Bastos de Matos, Antonio Rodrigues Fernandes, Katiane Raquel Mendes Barros, Danielle do Socorro Nunes Campinas und Cristine Bastos do Amarante. „Adsorption of cadmium and copper in representative soils of Eastern Amazonia, Brazil“. Semina: Ciências Agrárias 37, Nr. 5 (26.10.2016): 3005. http://dx.doi.org/10.5433/1679-0359.2016v37n5p3005.
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Studies of heavy metals adsorption in soil play a key role in predicting environmental susceptibility to contamination by toxic elements. The objective of this study was to evaluate cadmium (Cd) and copper (Cu) adsorption in surface and subsurface soil. Samples of six soils: Xanthic Hapludox (XH1 and XH2), Typic Hapludox (TH), Typic Rhodudalf (TR), Typic Fluvaquent (TF), and Amazonian dark earths (ADE) from Eastern Amazonian, Brazil. The soils were selected for chemical, physical and mineralogical characterization and to determine the adsorption by Langmuir and Freundlich isotherms. All soils characterized as kaolinitic, and among them, XH1 and XH2 showed the lowest fertility. The Langmuir and Freundlich isotherms revealed a higher Cu (H curve) than Cd (L curve) adsorption. Parameters of Langmuir and Freundlich isotherms indicate that soils TR, TF and ADE has the greatest capacity and affinity for metal adsorption. Correlation between the curve adsorption parameters and the soil attributes indicates that the pH, CEC, OM and MnO variables had the best influence on metal retention. The Langmuir and Freundlich isotherms satisfactorily described Cu and Cd soil adsorption, where TR, TF and ADE has a lower vulnerability to metal input to the environment. Besides the pH, CEC and OM the MnO had a significant effect on Cu and Cd adsorption in Amazon soils.
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Sueoka, Y., M. Sakakibara, S. Sano und K. Sera. „Heavy metal accumulation and the practical application of lichens as bioindicators for heavy metal pollution in surface soil“. International Journal of PIXE 26, Nr. 03n04 (Januar 2016): 85–91. http://dx.doi.org/10.1142/s0129083517500024.
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Levels of trace element pollution in surface soil have been estimated using soil analyses and leaching tests. These methods may reveal different results due to the effect of soil properties on the elemental availability. Therefore, this study advocates an alternative method for monitoring and assessment of trace element pollution in surface soil using terricolous fruticose lichens. Lichens and their substrata were analyzed using particle induced X-ray emission (PIXE), inductively coupled plasma-mass spectrometry (ICP-MS) and XRF to clarify the relationships between Cu, Zn, As and Pb concentrations in lichens and soils, including their absorption properties. Concentrations of these elements in the lichens were positively correlated with those in the soils regardless of lichen species, location, habitat, or conditions of soils. The analyzed lichens had neither competitive nor antagonistic properties in their elemental absorption, which made them good bioindicators of trace element pollution in surface soil. The distribution maps of average Cu, Zn, As and Pb concentrations at each sampling region was detected at almost all of the Cu, Zn and As pollution of the soils. Therefore, lichens could be used in practical applications to monitor Cu, Zn and As pollution in surface soils.
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Yelikbayev, B. K., Marcela C. Pagano und G. A. Jamalova. „HYPERACCUMULATOR PLANTS FOR PHYTOREMEDIATION OF SOIL CONTAMINATED WITH HEAVY METALS“. BULLETIN 5, Nr. 387 (15.10.2020): 34–40. http://dx.doi.org/10.32014/2020.2518-1467.140.
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Environmental pollution, including pollution of urban soils by heavy metals causes serious environmental concern around the world. Heavy metals accumulate relatively quickly in soil but their removal rate is very slow. Hyperaccumulator plants help cleanse the environment from heavy metals. Phytoremediation is cleansing of soils contaminated with heavy metals, using plants that accumulate significant amounts of metals. An important environmental problem in large industrial cities is pollution by toxic compounds, including heavy metals. Due to the potential toxicity and high resistance of metals, soils contaminated with these elements are an environmental problem that requires effective and affordable solution. In soils heavy metals are in varying degrees of accessibility to plants. Water-soluble forms of heavy metals, as a rule, are presented in the form of various salts and organic complex compounds. Phytoremediation of urban soils from heavy metals is an important environmental challenge. Among the wild species, a special group of heavy metal hyperaccumulator plants is highlighted. Some of the land plants that can accumulate abnormally high levels of potentially toxic trace elements are known as “hyperaccumulators” and their number includes about 500 taxa. Phytoremediation is much more environmentally friendly and cheaper than other techniques, so recently it has received widespread use in various countries.
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Ryzhenko, Nataliija O., S. V. Kavetsky und Volodymyr M. Kavetsky. „HEAVY METALS (Cd, Pb, Zn, and Cu) UPTAKE BY SPRING BARLEY IN POLLUTED SOILS“. Polish Journal of Soil Science 48, Nr. 1 (09.02.2016): 111. http://dx.doi.org/10.17951/pjss.2015.48.1.111.
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<p>Accumulation of Cd, Pb, Zn, Cu (HM) by spring barley (Hordeum vulgare L.) from sod podzolic sandy loam and chernozem soils, impacted by heavy metals pollution in the soils, is studied in the article. The aim of study has been to determine spring barley bioaccumulation capacity impacted by the HM pollution with the high level of Cd, Pb, Zn, Cu concentration in soils. The HM concentration diapason caused biomass reduction – the scope of toxic tolerance was obtained. The range of contaminants concentration in soil, which caused the plant biomass reduction, from the beginning to plants death – the scope of toxic tolerance, is the index of a species reaction on selected xenobiotic. It shows: “threshold” concentration of a contaminant that caused a plant biomass inhibition; toxic process development and the correlation between contaminants concentration in soil and/or plant and the plants inhibition; the concentration that caused the plant death. Spring barley accumulation indexes of the studied metals were calculated. Relevant scopes of the plant-uptake index for each metal were calculated. Dynamics of the toxic process development of spring barley as impacted by the pollution in the break-down by studied metals were observed on two different soils. Toxic process dynamic evaluation gives the possibility to simulate concentration of the trace metal in plants, concentration of available forms of these elements in soils, and also contamination level (content of metals) that caused plants height and plant weight reduction by 10%, 50% and 90%.</p><p> </p><p>Celem pracy było określenie wpływu zanieczyszczenia gleb piaszczysto-gliniastych bielicowych i czarnoziemów przez matale ciężkie (Cd, Pb, Zn, Cu) na biakumulację tych pierwiastków w jęczmieniu jarym (Hordeum vulgare L.). Podwyższone stężenie metali ciężkich spowodowało spadek plonu biomasy (od 10 do 90%). Stwierdzono, że im wyższe stężenie pierwiastków w glebie tym reakcja negatywna roślin była większa, aż do zamierania roślin. Wyliczono wskaźniki akumulacji dla każdego z pierwiastków metali. Ocena dynamiki procesu zanieczyszczenia gleb przez metale ciężkie (na podstawie wskaźników akumulacji) daje możliwość stymulowania stężenia tych pierwiastków w glebie. </p>
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Tomakov, Vladimir, und Maxim Tomakov. „Features of Heavy Metal Contamination of Agricultural Soils in the Kursk Region of Russia and Economic Assessment of Restoration“. SHS Web of Conferences 110 (2021): 01022. http://dx.doi.org/10.1051/shsconf/202111001022.
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Kursk region of Russia has unique fertile soils. Heavy metals are among the factors that pollute the soil. The article is devoted to the study of the spatial distribution of heavy metals in soils. The relevance of the study is that the value of the soil is determined by its value for obtaining environmentally friendly agricultural products. Data on the content of heavy metals in the soil can prevent intensive cultivation of crops. The task of the work is to identify heavy metals that predominate in the soils of various landscapes of the Kursk region. The assessment of soil contamination with chemical elements was carried out in the course of geo-ecological studies of black earth soils in the Kursk region of Russia. The selected soil samples were examined by semi-quantitative spectral analysis. The results obtained were subjected to statistical processing. It was found that cobalt is the main pollutant in the vast majority of sampling points. In other zones, molybdenum, lead, zinc, and chromium predominate in approximately equal amounts. Soils in the surveyed area belong to the permissible category of contamination with chemical elements. Soil remediation should be applied in local areas.
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Baugé, S. M. Y., L. M. Lavkulich und H. E. Schreier. „Phosphorus and trace metals in serpentine-affected soils of the Sumas Basin, British Columbia“. Canadian Journal of Soil Science 93, Nr. 3 (August 2013): 359–67. http://dx.doi.org/10.4141/cjss2012-138.
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Baugé, S. M. Y., Lavkulich, L. M. and Schreier, H. E. 2013. Phosphorus and trace metals in serpentine-affected soils of the Sumas Basin, British Columbia. Can. J. Soil Sci. 93: 359–367. Soils of the Sumas watershed in the Lower Fraser Valley of British Columbia have contrasting P, Mg and trace elements contents arising from two major sources, periodic deposition of serpentine-rich sediments and intensive agricultural activities. Four study sites were examined for soil P by several extractants commonly used for P availability assessments. The results were compared with aqua regia to determine best estimates of extractable P. In addition, these extractants were evaluated as indices of associated trace metal amounts. Aqua regia, acid ammonium oxalate and 1 M HCl extracted similar amounts of P and trace metals. Acid ammonium oxalate was found to be closely related to the estimates of total P and recoverable elements, followed by 1 M HCl. There was clear separation of the sites by both P values and trace elements associated with serpentine (Cr and Ni) and those from agricultural activities (Cu and Zn). Results suggest that a single extraction, 1 M HCl, can be an effective measure of both available P and trace elements in serpentinitic soils.
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Carson, Allan W., P. Michael Rutherford und Philip J. Burton. „Desulphurized tailings serve as a useful soil supplement for mine reclamation“. Canadian Journal of Soil Science 94, Nr. 4 (August 2014): 529–41. http://dx.doi.org/10.4141/cjss2013-116.
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Carson, A. W., Rutherford, P. M. and Burton, P. J. 2014. Desulphurized tailings serve as a useful soil supplement for mine reclamation. Can. J. Soil Sci. 94: 529–541. Soil is often in limited supply for use in mine reclamation activities; it may be necessary to build soils (Anthroposols) using locally available substrates. Eight test plots were established at Huckleberry Mine, Houston, BC, to investigate soil properties and evaluate the performance and metal uptake of plants established on stockpiled soils that were or were not supplemented with non-acid generating sand (NAGS) and fertilizer. Concentrations of total and extractable trace elements (including base metals) were lower in NAGS-supplemented soils than in non-supplemented soils. Supplementing soils with NAGS reduced cation exchange capacity and exchangeable base cations, yet plant performance was not significantly lower than that observed in non-supplemented soils. When combined with a fertilizer application, plant performance on NAGS-supplemented soils significantly increased. For heavy metals analyzed in plant tissues, only molybdenum (Mo) concentrations exceeded the National Research Council’s (NRC) recommended maxima for beef cattle. The copper (Cu):Mo ratio for all treatments was above a suggested adverse-health threshold value for ruminant feeds (with lesser values leading to adverse health effects). The use of NAGS (combined with fertilizer) as a supplement to stockpiled mine soil can increase the quantity of growth media for reclamation and is not expected to have any adverse effects on plant growth or the metal content in above-ground vegetation.
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BOUMAZA, Bilal, und Tatyana Vladimirovna CHEKUSHINA. „Assessment of metallic trace elements contamination in a mining area of the processing of Djebel Onk phosphate ore (Algeria)“. NEWS of the Ural State Mining University 1 (15.03.2021): 7–16. http://dx.doi.org/10.21440/2307-2091-2021-1-7-16.
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Research relevance. Phosphate mining activities are one of the main sources of contamination by heavy metals since they harmfully affect the soil and lead to the degradation of the ecosphere. Research aim. This study aims at characterizing and evaluating the metallic contamination of soils in the vicinity of the Djebel Onk mine in the town of Bir El Ater (Wilaya of Tébessa) in eastern Algeria, and particularly focusing on estimating the spatial variability of this contamination and the extent of the contaminated area. Methodology. The physicochemical characteristic (pH) was determined by pH-meter, whereas AAS was used for the determination of heavy metals (Pb, Cu, Zn, Cd) in the examined soil Research results. The results reveal that soils that are close to the mine site studied and even those that are far away are heavily contaminated with heavy metals — lead (Pb), zinc (Zn), copper (Cu) and cadmium (Cd); the results also point out to a high variability of concentrations not only between sampling sites but also within the same mine site. The analysed soil pollution index is generally high even for soils sampled downstream more than 30 km from the mine site, whereas it is extremely high on the surface of the tailings slopes, underlining the fact that tailings are considered perennial sources of heavy metal contamination in their current state. Conclusion. The unhealthy area affected by metal pollution from mining sites in the Djebel Onk is very large as a result of the dispersion, by wind and water transport, of residual pollutants from the mine wastes abandoned on site. Remediation measures must be put into place to immobilize the pollutants and limit their spread to the environment Keywords: Soil contamination, Algeria, heavy metals, phosphate mine, pollution index.
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McLaren, R. G., A. Black und L. M. Clucas. „Changes in Cu, Ni, and Zn availability following simulated conversion of biosolids-amended forest soils back to agricultural use“. Soil Research 48, Nr. 3 (2010): 286. http://dx.doi.org/10.1071/sr09138.
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In this study we examined the bioavailability and chemistry of Cu, Ni, and Zn in metal-spiked, biosolids-amended forest (Pinus radiata) soils that had undergone a simulated conversion back to agricultural use. Mixing of the biosolids-treated forest litter into the underlying mineral soil resulted in high concentrations of each metal in easily extractable and soil solution forms. There was also very little change in these concentrations during a subsequent 2-year incubation period of the samples. Chemical speciation of the soil solutions using WHAM 6 showed that Cu was dominated by organic complexes, whereas most Ni and Zn was present as Ni2+ and Zn2+, with generally <5% of these elements present as organic complexes. Addition of lime to the soils substantially decreased both readily extractable and soil solution metal concentrations. However, even in their unlimed state, although plant metal concentrations were increased by the original biosolids treatments, there were no adverse effects due to the metals on plant growth as determined in a wheat germination and seedling growth test. In this study, the DGT technique showed considerable promise for assessing metal availability to plants. However, the study suggests that conversion of biosolids-treated forest soils back for agricultural use is unlikely to result in any substantial problems related to the metal loadings built up in the forest litter layer.
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Zhang, Bimin, Zhixuan Han, Xueqiu Wang, Hanliang Liu, Hui Wu und Hui Feng. „Metal-Bearing Nanoparticles Observed in Soils and Fault Gouges over the Shenjiayao Gold Deposit and Their Significance“. Minerals 9, Nr. 7 (05.07.2019): 414. http://dx.doi.org/10.3390/min9070414.
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Mineral deposits concealed by thick cover sequences present special problems for geochemical exploration. A variety of penetrating geochemical methods have been developed in the last few decades to explore for buried deposits. The theoretical basis of the mechanism by which metals migrate upward from buried deposits through the cover to the surface is still not fully understood. One hypothesis is that metal particles or metal elements could be carried onto bubbles or micro-flow of geogas and migrate upward to the surface. After years of study, nano-scale metal-bearing particles have been widely observed in geogas samples from different kinds of concealed deposits. However, the occurrence of these metal-bearing particles carried by geogases in near-surface media, such as soil, has not been studied in detail. In this study, metal-bearing nanoparticles were observed in samples from soils and fault gouges over the Shenjiayao gold deposit. The results indicate that (1) the ore-forming elements in soils can only come from deep-seated ore bodies and they occur in nanoparticles in the study area; (2) there is an obvious relationship between metal nanoparticles in fault gouges and soils; (3) the metallic nanoparticles in fault gouges represent a transitional phase along the whole vertical migration process. In addition, the observation results show that the metal-bearing nanoparticles tend to be adsorbed on the surface of clay minerals, which provide theoretical support for using fine fraction soils as sampling media to carry out geochemical exploration in sediment-covered terrains. Based on the results and discussion, a simple migration model was built in this paper.
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Biró, B., A. Füzy und K. Posta. „Long-term effect of heavy metal loads on the mycorrhizal colonization and metal uptake of barley“. Agrokémia és Talajtan 59, Nr. 1 (01.06.2010): 175–84. http://dx.doi.org/10.1556/agrokem.59.2010.1.21.
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A pot experiment was designed to study the colonization of indigenous arbuscular mycorrhizal fungi (AMF) on barley ( Hordeum vulgare L.) host plant. Soils of the pots were collected from a long-term field microelement loading experiment on calcareous chernozem soil twelve years after 13 heavy metals (Al, As, Ba, Cd, Cr, Cu, Hg, Mo, Ni, Pb, Se, Sr and Zn) were applied once in four doses (0, 30, 90 and 270 mg element·kg -1 d.w.). The biomass production and element accumulation of the host plant, the various colonization values of the arbuscular mycorrhiza fungi (AMF) – such as colonization intensity (M %), arbusculum richness (A %) in the root system and the sporulation intensity (g -1 dry soil) in the rhizosphere – were measured. When considering the twelve-year adaptation process of the AM fungal populations at the various metal loads, a relatively balanced inside mycorrhiza colonization was found, suggesting the potentials for the selection of tolerant fungi in metal contaminated soils. The balanced infection intensity (M %) of the AM fungi and their common strategies with the host plant have resulted a nonsignificant shoot and root biomass production of barley in general. Mycorrhiza sporulation in the root system proved to be much variable and indicated the toxicity of metals and metal rates. Cd, Pb and Sr elements significantly reduced spore numbers, while a value of 34 spores·g -1 soil was counted in the case of Ni in comparison to the control’s 22 spores·g -1 soil value. Stress-defending strategies of the fungal–plant symbiosis, such as the increased arbusculum richness (A %) could be established for the Hg and Pb rates. In the case of Cd an increased root biomass production became a tool for stress alleviation and reduced the metal allocation towards the shoots. Mycorrhiza fungi are part of the common plant–microbe interactions and appropriate defending mechanisms in metal contaminated soils.
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Liu, Lirong, Dinggui Luo, Guangchao Yao, Xuexia Huang, Lezhang Wei, Yu Liu, Qihang Wu, Xiaotao Mai, Guowei Liu und Tangfu Xiao. „Comparative Activation Process of Pb, Cd and Tl Using Chelating Agents from Contaminated Red Soils“. International Journal of Environmental Research and Public Health 17, Nr. 2 (13.01.2020): 497. http://dx.doi.org/10.3390/ijerph17020497.
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Adding chelating agents is a critical technique of heavy metal activation for enhancing phytoextraction through the formation of soluble metal complexes which will be more readily available for extraction. The preliminary, dynamic, equilibrium activation experiments and speciation analysis of Pb, Cd and Tl in contaminated red soils were used to select six chelates with relatively good activation performance from nine chelates, and the effects of dosage and pH on the heavy metals activation were studied systematically. Results showed that the activation of Pb, Cd and Tl by chelates reached equilibrium within 2 h, and the activation process showed three stages. Under neutral conditions, chelates had better activation performance on Pb- and Cd-contaminated soils. Except for S,S-ethylenediamine disuccinic acid (S,S-EDDS) and citric acid (CA), the maximum equilibrium activation effect (MEAE) of ethylenediaminetetraacetic acid (EDTA), N,N-bis (carboxymethyl) glutamic acid (GLDA), diethylenetriaminepentaacetic acid (DTPA) and aminotriacetic acid (NTA) was over 81%. The MEAE of Tl-contaminated soil was less than 15%. The decreasing order of the dosage of chelating agents corresponding to MEAE for three types of contaminated soils was Pb-, Cd- and Tl-contaminated soil, relating to the forms of heavy metals, the stability constants of metal–chelates and the activation of non-target elements Fe in red soil. Under acidic conditions, the activation efficiencies of chelates decreased to differing degrees in Pb- and Cd-contaminated soils, whereas the activation efficiencies of chelating agents in Tl-contaminated soils were slightly enhanced.
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Yuan, Xuyin, Yimin Wang, Doudou Tang, Xiaohui Zhang, Lei Zhang und Haiyan Zhang. „Distribution and Phytoavailability of Potentially Toxic Metals in Different Fe/Mg Mine Tailings“. International Journal of Environmental Research and Public Health 15, Nr. 11 (06.11.2018): 2475. http://dx.doi.org/10.3390/ijerph15112475.
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The environmental risk of potentially toxic metals in tailing soils is of universal concern. We conducted a 3-month pot experiment to research the distribution and variations of potentially toxic metals (PTMs), and the translocation and accumulation capability of these metals (Cr, Ni, Mn, Cu, Zu) in natural plants for three Fe/Mg tailing soils (serpentine-type, olivine-type and magnetite-type) with growth of a grass plant-Imperata cylindrica. We used comparative analysis, regression analysis and correlation analysis to process relevant experimental data. Results showed the rhizosphere tailing soils decreased from 3.70% to 16.8%, compared to the bulk soils, after growth of Imperata cylindrica, and the acid soluble fraction of Mn, Cu and Zn increased significantly. Cu and Zn were more bioavailable than other PTMs, especially for serpentine-type tailing soils. Linear regression analysis indicated that non-residual fractions showed different effects on metal concentrations of Imperata cylindrica. The non-residual metal fractions of serpentine-type and olivine-type tailing soils showed better correlations with metal concentrations in grass plants than those of magnetite-type tailing soils. We found that the chemical compositions of tailing soils showed remarkable effects on Ni and Mn compared with other elements, especially Mg and Al. Overall, the grass plant can alter the metal distribution, enhance metal bioavailability and promote land use of Fe/Mg tailing soils.
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Dąbkowska-Naskręt, Halina, Szymon Różański und Agata Bartkowiak. „Forms and mobility of trace elements in soils of park areas from the city of Bydgoszcz, north Poland“. Soil Science Annual 67, Nr. 2 (01.06.2016): 73–78. http://dx.doi.org/10.1515/ssa-2016-0010.
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AbstractIncreasing human activity affects urban ecosystem, including soils. The objective of the study were examine the content of lead, cadmium, copper, zinc, and manganese in soils of city parks and green areas from Bydgoszcz agglomeration, north Poland, estimate their forms and mobility, characterize distribution within soil profile, and estimate their origin – anthropogenic or natural. Three green areas from the older part of the city were selected for the study. Multistep sequential extraction method was conducted for the separation of seven metal fractions. It is concluded that soil studied were contaminated mainly by zinc and lead. These metals exist mainly in relatively non mobile forms i.e. associated with amorphous and crystalline iron oxides and with soil organic matter. The distribution within soil depth varied due to the elution process and variation of mixed soil material and additives.
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Andrusyshyna, I. M., I. O. Holub, V. F. ,. Demchenko und O. G. Lampeka. „Comparative assessment of heavy metal content in soils of different urban agglomerations: methodological approaches to environmental monitoring“. Environment & Health, Nr. 4 (97) (Dezember 2020): 71–79. http://dx.doi.org/10.32402/dovkil2020.04.071.
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Objective: We studied the regional characteristics of soil pollution with heavy metals and other chemical elements, presented their comparative ecological and hygienic assessment. Materials and methods: We detected the content of 12 elements in the soils of urban agglomerations of the city of Kyiv (park, residential and transport zones), Donetsk oblast (Mariupol, Pisky etc.) and in the vicinity of the city of Halych (Ivano-Frankivsk oblast) with the help of the method of optical emission spectrometry. We studied the gross content of heavy metals in soils, determined their mobile forms, calculated the concentration coefficients and the indicator of the total soil cover pollution of urban agglomerations, established characteristic relationships between metals and their technogenic geochemical associations. Results and discussion: Among the analyzed chemical elements in soils of urban areas, the high content of Al, Mn and Crattracts a special attention. In the number of cases, it was higher than the MAC and the background level. The characteristic technogenic geochemical associations of heavy metals for studied territories were established: Cu > Cr > Pb > Zn > Ni > Mn. The mobility of heavy metals in technologically polluted soils increases in comparison with the background levels. Conclusion: A comparative assessment of soil pollution in the surveyed regions of Kyiv, Ivano-Frankivsk and Donetsk showed that they are under complex environmental pressure because of anthropogenic and technogenic environmental pollution with heavy metals.
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Maisonnave, V., M. Montréjaud-Vignoles, C. Bonnin und J. C. Revel. „Impact on crops, plants and soils of metal trace elements transfer and flux, after spreading of fertilizers and biosolids“. Water Science and Technology 46, Nr. 10 (01.11.2002): 217–24. http://dx.doi.org/10.2166/wst.2002.0335.
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In France, the yearly production of sludge from wastewater treatment plants is 900,000 metric tons dry matter and 60% of this is reused for land application. Today, the sustainability of this pathway is open to question. Among the different arguments cited are the levels of metal trace elements and the risks of accumulation in soils. With the ultimate aim of agronomic sludge recycling, the transfer of metal trace elements has been studied using vegetation containers planted with rye-grass under controlled conditions of temperature and humidity. Samples of a domestic sludge, an industrial sludge and a fertilizer have been mixed with the soil. By monitoring the growth of the rye-grass, we have been able to observe that the addition of sludge increases production of plant matter. It appears that the roots absorb higher quantities of metal trace elements and form a barrier to their transfer to the above ground parts of the rye-grass. For the group of metal trace elements studied, no significant differences have been observed between the rye-grass grown on soil alone and that on soils amended with fertilizer or urban sludge. For the majority of the vegetation containers studied, there has been no significant modification in the soil metal distribution over time, as a result of the addition of urban sludge, and no significant difference between fertilizers and sludges.
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Karak, Tanmoy, Uttam Kumar Singh und D. K. Das. „Role of Various Extractants in Removing Group-IIB Elements of Soils Incubated with EDTA“. Scientific World JOURNAL 4 (2004): 1038–45. http://dx.doi.org/10.1100/tsw.2004.209.
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This paper presents the results of an experimental investigation undertaken to evaluate different extractant solutions viz. HCl, Mg(NO3)2, and DTPA with the range of concentration from 0.001 to 0.1Nafter incubation with group-IIB metals (Zn, Cd, and Hg) and EDTA to understand the capability to remove Zn, Cd, and Hg from soils. Two noncontaminated soils, one acidic (GHL) and the other alkaline (KAP), in reaction were taken from an agricultural field of West Bengal, India for this investigation. Experiments were conducted on these two soils spiked with ZnII, CdII, and HgIIin concentrations of 612, 321, and 215 mg/kg for soil GHL and 778, 298, and 157 mg/kg for soil KAP, respectively, which simulate typical electroplating waste contamination. The removal of Zn, Cd, and Hg in soil GHL within the range of HCl concentrations was 8.216.5, 12.219.1, and 4.36.9 whereas these were 6.57.6, 8.514.1, and 3.25.2 in soil KAP. The removal of Zn, Cd, and Hg in soil GHL within the range of Mg(NO3)2concentrations were 12.228.5, 19.124.6, and 18.219.1 whereas these were 9.112.1, 8.312.1, and 10.648.1 in soil KAP. For DTPA extractant, the percent removal of metal was found to be significantly higher than the other two extractants, which corroborates that DTPA is a better extractant for soil cleaning.
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Ferronato, Chiara, Gilmo Vianello, Mauro De Feudis und Livia Vittori Antisari. „Technosols Development in an Abandoned Mining Area and Environmental Risk Assessment“. Applied Sciences 11, Nr. 15 (29.07.2021): 6982. http://dx.doi.org/10.3390/app11156982.
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The study of Technosols development, spatial distribution and physicochemical characteristics is becoming more and more important in the Anthropocene Era. The aim of the present study was to assess soil features and potential heavy metal release risk of soils developed on different mine tailing types after the waste disposal derived from mining activity in Central Italy. Soils were analyzed for their morphological, physical and chemical properties, and a chemical sequential extraction of heavy metals was performed. The investigated soils were classified as Technosols toxic having in some layer within 50 cm of the soil surface inorganic materials with high concentrations of toxic elements. Our findings showed that the bioavailability of potentially toxic element concentrations in the soil changed according to the origin of the mine tailing. However, because of the acidic pH, there is a serious risk of metals leaching which was reduced where the soil organic matter content was higher.
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Liu, Man, und Guilin Han. „Distribution of soil nutrients and erodibility factor under different soil types in an erosion region of Southeast China“. PeerJ 9 (16.06.2021): e11630. http://dx.doi.org/10.7717/peerj.11630.
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Background Soil erosion can affect the distribution of soil nutrients, which restricts soil productivity. However, it is still a challenge to understand the response of soil nutrients to erosion under different soil types. Methods The distribution of soil nutrients, including soil organic carbon (SOC), soil organic nitrogen (SON), and soil major elements (expressed as Al2O3, CaO, Fe2O3, K2O, Na2O, MgO, TiO2, and SiO2), were analyzed in the profiles from yellow soils, red soils, and lateritic red soils in an erosion region of Southeast China. Soil erodibility K factor calculated on the Erosion Productivity Impact Calculator (EPIC) model was used to indicate erosion risk of surface soils (0∼30 cm depth). The relationships between these soil properties were explored by Spearman’s rank correlation analysis, further to determine the factors that affected the distribution of SOC, SON, and soil major elements under different soil types. Results The K factors in the red soils were significantly lower than those in the yellow soils and significantly higher than those in the lateritic red soils. The SON concentrations in the deep layer of the yellow soils were twice larger than those in the red soils and lateritic red soils, while the SOC concentrations between them were not significantly different. The concentrations of most major elements, except Al2O3 and SiO2, in the yellow soils, were significantly larger than those in the red soils and lateritic red soils. Moreover, the concentrations of major metal elements positively correlated with silt proportions and SiO2 concentrations positively correlated with sand proportions at the 0∼80 cm depth in the yellow soils. Soil major elements depended on both soil evolution and soil erosion in the surface layer of yellow soils. In the yellow soils below the 80 cm depth, soil pH positively correlated with K2O, Na2O, and CaO concentrations, while negatively correlated with Fe2O3 concentrations, which was controlled by the processes of soil evolution. The concentrations of soil major elements did not significantly correlate with soil pH or particle distribution in the red soils and lateritic red soils, likely associated with intricate factors. Conclusions These results suggest that soil nutrients and soil erodibility K factor in the yellow soils were higher than those in the lateritic red soils and red soils. The distribution of soil nutrients is controlled by soil erosion and soil evolution in the erosion region of Southeast China.
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Huang, Wen-Lii, Wei-Hsiang Chang, Shu-Fen Cheng, Huai-Yuan Li und Hsiu-Ling Chen. „Potential Risk of Consuming Vegetables Planted in Soil with Copper and Cadmium and the Influence on Vegetable Antioxidant Activity“. Applied Sciences 11, Nr. 9 (22.04.2021): 3761. http://dx.doi.org/10.3390/app11093761.
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Once in soil and water, metals can enter the food chain, and the consumption of contaminated crops can pose a serious risk to human health. This study used pot experiments to evaluate the accumulation of metal elements and their influence on levels of antioxidants in vegetables. The current study clearly demonstrates that metals accumulated in the five vegetables that were planted in the contaminated soils, especially so for water spinach. Cd accumulation of all of the vegetables planted in the contaminated soils was greater Cu. The low accumulation rate that was seen in sweet potato leaf, potato, and tomato indicated their suitability for planting in suspected contaminated soil, such as at farms nearby metal industries, in replacement of high accumulators, such as leafy vegetables. The non-carcinogenic HI of Cd exposure from water spinach and sweet potato were >1, whereas those for Cu were <1. This study suggests that residents may experience health risks due to vegetable consumption, and that children are vulnerable to the adverse effects of heavy metal ingestion.
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Wang, Deng Feng, Hong Juan Wu, Jie Chen, Shi Xing Jiao und Xue Min Dai. „Assessment of Heavy Metal Pollution of Urban Roadside Soil with Set Pair Analysis and Geoaccumulation Index“. Advanced Materials Research 113-116 (Juni 2010): 960–64. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.960.
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The assessment of pollution levels of heavy metals soil contamination is significant to the health of human kind. Two methods, Set Pair Analysis (SPA) and Geoaccumulation Index (Igeo), are applied to assess the urban roadside soil heavy metals pollution levels and compare the assessment results with Fuzzy Comprehensive Analysis (FCA). The assessment results of SPA are inconsistent with the FCA. The ranks of roadside soil heavy metals, assessed by Igeo, indicate that the result of FCA is determined by most contaminated heavy metal, the SPA is determined by the contents distribution of all elements. The mean and standard deviation of heavy metal content in research soils are applied to establish an assessment standard and this method is also applicable if there is lower differentiation rate or no uniform standards.