Academic literature on the topic 'Acide sulfate soils'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Acide sulfate soils.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Acide sulfate soils"

1

Hara, Junko, Yasuhide Sakamoto, and Yoshishige Kawabe. "Evaluation of Natural Degradation of Persistent Organic Chemicals in Acid Sulfate Soils Distributed in a Coastal Area." International Journal of Environmental Science and Development 7, no. 6 (2016): 441–44. http://dx.doi.org/10.7763/ijesd.2016.v7.816.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

KIMPE, C. R. DE, M. R. LAVERDIERE, and R. W. BARIL. "CARACTÉRISTIQUES DES SOLS SULFATÉS ACIDES DE LA SÉRIE DE L'ANSE EN MILIEU ESTUARIEN (QUÉBEC)." Canadian Journal of Soil Science 68, no. 3 (August 1, 1988): 577–92. http://dx.doi.org/10.4141/cjss88-056.

Full text
Abstract:
Acid sulfate soils were sampled according to the transect method in four bays along the south shore of the St. Lawrence river to determine their properties in their area of distribution. In each bay, six profiles of cultivated soils were sampled along a transect perpendicular to the river. One non-cultivated profile was also sampled at l'Isle-Verte. The lower limit of the B horizons, between 79 and 89 cm, suggested a homogeneous development of these soils across the area. Most profiles contained jarosite in the lower Bg and, sometimes, in the C horizons; this mineral was absent in the upper part of the profiles of soils that had been limed prior to cultivation. Total S content increased with depth, but only a few horizons had a content > 0.75% presumably because of sulfate leaching once the soils were drained. Organic C content in the de l'Anse soils decreased less rapidly with depth than in other gleysolic soils, because vegetation grew while sediments were being deposited. Key words: Acid sulfate soils, total S, recent marine sediments, jarosite
APA, Harvard, Vancouver, ISO, and other styles
3

Yau, C. C., V. N. L. Wong, and D. M. Kennedy. "Soil chemistry and acidification risk of acid sulfate soils on a temperate estuarine floodplain in southern Australia." Soil Research 54, no. 7 (2016): 787. http://dx.doi.org/10.1071/sr15174.

Full text
Abstract:
The distribution and geochemical characterisation of coastal acid sulfate soils (CASS) in Victoria in southern Australia is relatively poorly understood. This study investigated and characterised CASS and sulfidic material at four sites (wetland (WE), swamp scrub (SS), woodland (WO) and coastal tussock saltmarsh (CTS)) on the estuarine floodplain of the Anglesea River in southern Australia. Shell material and seawater buffered acidity generated and provided acid-neutralising capacity (up to 10.65% CaCO3-equivalent) at the sites located on the lower estuarine floodplain (WO and CTS). The SS site, located on the upper estuarine floodplain, can potentially acidify soil and water due to high positive net acidity (>200molH+t–1) and a limited acid-neutralising capacity. High titratable actual acidity in the SS and WO profiles (>270molH+t–1) were the result of high organic matter in peat-like layers that can potentially contribute organic acids in addition to acidity formed from oxidation of sulfidic sediments. The results of the present study suggest that the environments and chemistry of acid sulfate soils in southern Australia are distinct from those located in eastern Australia; this may be related to differences in estuarine processes that affect formation of acid sulfate soils, as well as the geomorphology and geology of the catchment.
APA, Harvard, Vancouver, ISO, and other styles
4

Nanba, K., and Gary M. King. "Response of Atmospheric Methane Consumption by Maine Forest Soils to Exogenous Aluminum Salts." Applied and Environmental Microbiology 66, no. 9 (September 1, 2000): 3674–79. http://dx.doi.org/10.1128/aem.66.9.3674-3679.2000.

Full text
Abstract:
ABSTRACT Atmospheric methane consumption by Maine forest soils was inhibited by additions of environmentally relevant levels of aluminum. Aluminum chloride was more inhibitory than nitrate or sulfate salts, but its effect was comparable to that of a chelated form of aluminum. Inhibition could be explained in part by the lower soil pH values which resulted from aluminum addition. However, significantly greater inhibition by aluminum than by mineral acids at equivalent soil pH values indicated that inhibition also resulted from direct effects of aluminum per se. The extent of inhibition by exogenous aluminum increased with increasing methane concentration for soils incubated in vitro. At methane concentrations of >10 ppm, inhibition could be observed when aluminum chloride was added at concentrations as low as 10 nmol g (fresh weight) of soil−1. These results suggest that widespread acidification of soils and aluminum mobilization due to acid precipitation may exacerbate inhibition of atmospheric methane consumption due to changes in other parameters and increase the contribution of methane to global warming.
APA, Harvard, Vancouver, ISO, and other styles
5

Inubushi, Kazuyuki, Kenzo Hori, Satoshi Matsumoto, and Hidenori Wada. "Anaerobic decomposition of organic carbon in paddy soil in relation to methane emission to the atmosphere." Water Science and Technology 36, no. 6-7 (September 1, 1997): 523–30. http://dx.doi.org/10.2166/wst.1997.0632.

Full text
Abstract:
Paddy fields are regarded as one of the most important sources of methane emission which is enhancing global warming. To estimate decomposition processes of organic carbon in paddy soil quantitatively, firstly, kinetics of anaerobic decomposition of soil organic carbon (C) were investigated in laboratory experiments with or without organic amendments at 5, 20, 30 and 40 °C for 84 days of incubation. Produced CH4, CO2 and accumulated fatty acids were measured periodically, and first-order kinetics models were applied to the amount of decomposed C. Two components' model fitted decomposition pattern for unamended soil, but not for glucose or alanine-amended soils. To compare the parameters included in the model with those of adjacent upland soil, paddy soil contained smaller but faster components of decomposable organic matter. Secondly, methane emission from paddy soil was examined in paddy soil microcosms to find the possible mitigation options for reduction of the emission. Ammonium sulfate and potassium sulfate (S) were applied to compare with ammonium chloride and potassium chloride (C). Additionally ferrous oxide (F) was also applied to half sets of each treatment to make totally four treatments. Methane emission rate was significantly reduced by addition of S, much more effective than addition of F. Gas formation in the soil corresponded with the amendments, and the ratio of produced CH4 to CO2 decreased by addition of S at peak time of methane emission.
APA, Harvard, Vancouver, ISO, and other styles
6

Reyes-Ortigoza, Amada Laura. "Características de la actividad enzimática y el humus en suelos de chinampa." REVISTA TERRA LATINOAMERICANA 37, no. 4 (October 7, 2019): 339. http://dx.doi.org/10.28940/terra.v37i4.487.

Full text
Abstract:
The chinampas are protected natural areas that have suffered degradation due to saline contamination and type of management. The objective was to study enzymatic activity and type of humus in chinampas with different salinity, land use and geographical location. Forty-five soil samples were studied, 15 at each site (Xochimilco, San Gregorio Atlapulco (SGA) and Tláhuac). Each site had a different use: five had pastures, five had agricultural crops and five were abandoned. pH, EC, saline ions, enzymatic activity (glucosidase, phosphatase, urease, sulfatase, catalase and dehydrogenase) and carbon in humic substances were evaluated. EC, PSI and pH classified the cultivated soils of SGA and Xochimilco as saline, but in Tláhuac the soils of abandoned and pasture chinampas were sodic saline. Geographic location and land use changed enzyme activity (except for urease and glucosidase) and characteristics of the humus [percentages of carbon of humic acids (HA) (humic acids), fulvic acids (FA), and humins]. There were statistical differences (Tukey P < 0.05). The cultivated soils had more urease, phosphatase and sulfatase activity, while in the pasturelands dehydrogenase and catalase were more active. Higher carbon content in AH was found in pastureland and chinampas of Tlahuac, while in SGA and abandoned chinampas carbon content was higher in FA.
APA, Harvard, Vancouver, ISO, and other styles
7

Marchi, Giuliano, Luiz Roberto Guimarães Guilherme, and Andrew C. Chang. "Plant availability of trace elements in sewage sludge-treated soils: methodology¹." Revista Brasileira de Ciência do Solo 35, no. 4 (August 2011): 1453–60. http://dx.doi.org/10.1590/s0100-06832011000400039.

Full text
Abstract:
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.
APA, Harvard, Vancouver, ISO, and other styles
8

Martinez, C. E., A. W. Kleinschmidt, and M. A. Tabatabai. "Sulfate adsorption by variable charge soils: Effect of low-molecular-weight organic acids." Biology and Fertility of Soils 26, no. 3 (February 20, 1998): 157–63. http://dx.doi.org/10.1007/s003740050361.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

COOTE, D. R., S. SHAH SINGH, and C. WANG. "A PROPOSED METHODOLOGY FOR ASSESSING THE RELATIVE IMPACT OF ACID RAIN AND NITROGEN FERTILIZERS ON ACIDITY OF AGRICULTURAL SOILS IN CANADA." Canadian Journal of Soil Science 69, no. 3 (August 1, 1989): 611–27. http://dx.doi.org/10.4141/cjss89-061.

Full text
Abstract:
Acid rain and N fertilizers both contribute to soil acidity, but no method has been available to compare their relative impacts. A simple model (SOLACID) is presented to assess quantitatively the acidifying effects of precipitation and N fertilizers on agricultural soils. Acid rain has been treated as a dilute solution of NH4NO3, (NH4)2SO4 and associated acids. Soil and plant pathways are considered for [Formula: see text], [Formula: see text]and [Formula: see text] by way of leaching, gaseous losses from microbial reduction, plant uptake and removal, and organic immobilization and mineralization. Leaching of [Formula: see text] was the factor to which the model was most sensitive. A relationship between base saturation and base cation leaching is described. Field data reported from 21 treatments at six experimental sites were used to test the model, which provided reliable estimates of final pH (r2 = 0.92**) and of changes in base saturation (r2 = 0.86**). Compared with previously published methods, the model provided the best estimates of lime requirements as computed from field measurements (r2 = 0.87**). Key words: Ammonia, sulfate, leaching, nitrification
APA, Harvard, Vancouver, ISO, and other styles
10

Evans, A., and T. J. Anderson. "Aliphatic Acids: Influence on Sulfate Mobility in a Forested Cecil Soil." Soil Science Society of America Journal 54, no. 4 (July 1990): 1136–39. http://dx.doi.org/10.2136/sssaj1990.03615995005400040036x.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic "Acide sulfate soils"

1

Yvanes-Giuliani, Yliane. "Aluminium geochemistry in coastal lowland acid sulfate soils (CLASS) : speciation, reactivity and mobility." Thesis, Aix-Marseille, 2014. http://www.theses.fr/2014AIXM4364.

Full text
Abstract:
Ce projet de thèse vise à étudier les processus géochimiques de l'aluminium dans les sols acides à sulfates. Les résultats obtenus avec le dispositif de dialyse de Donnan montrent que l'aluminium dans la solution du sol est presque exclusivement (> 98%) présent sous forme de complexes de charge négative, vraisemblablement des organo-complexes d'aluminium. Les concentrations d'aluminium isotopiquement échangeables (valeurs-E) et les concentrations obtenues par extractions chimiques révèlent qu'une solution de 1 M KCl sous-estime systématiquement les valeurs E. Une méthode d'extraction séquentielle a révélé qu'une quantité importante de minéraux primaires (initialement présents dans les sols) a déjà été dissoute, comme en témoignent les concentrations élevées d'aluminium présentes en tant que minéraux secondaires d'aluminium. Ces études permettent de mieux comprendre la géochimie de l'aluminium dans les sols CLASS et de pouvoir intégrer ces connaissances dans la gestion des sols
The aim of this thesis was to further understanding on Al geochemistry in coastal lowland acid sulfate soils (CLASS). It was observed that Al was present almost solely (> 98%) as negatively charged complexes in CLASS pore-waters, presumably with natural organic matter. Isotopically exchangeable concentrations (E-values) of Al and extraction solutions used to estimate the exchangeable pool showed that 1 M KCl always underestimated isotopically exchangeable Al concentrations in these soils and that 0.2 M CuCl2 improved agreement between both methodologies but sometimes overestimated corresponding E values. A sequential extraction procedure showed that substantial amounts of Al have already been dissolved from primary aluminosilicates initially present in the soils and remain in the soils mostly as reactive secondary Al minerals. The outcomes of this thesis significantly further our understanding of Al geochemistry in CLASS environments and how this knowledge can be incorporated into land management practices
APA, Harvard, Vancouver, ISO, and other styles
2

Karczewska, Hanna. "The effects of acid leaching on some physico-chemical properties of Quebec soil /." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=64017.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Morgan, Marcus John. "Optimal prediction of coastal acid sulphate soil severity using geographic information systems." Access electronically, 2006. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20070208.153133/index.html.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Mustafa, Akhmad Biological Earth &amp Environmental Sciences Faculty of Science UNSW. "Improving acid sulfate soils for brackish water aquaculture ponds in South Sulawesi, Indonesia." Awarded by:University of New South Wales. Biological, Earth & Environmental Sciences, 2007. http://handle.unsw.edu.au/1959.4/40619.

Full text
Abstract:
Brackish water aquaculture is one of the largest coastal industries in Indonesia. This farming system involves the construction of ponds m coastal sediments. Many ponds in Indonesia have been abandoned due to past development of ponds in acid 8ulfate soils (ASS); these soils produce sulfuric acid through the oxidation of pyrite du ring and after the sediments have been excavated. The soils also contain elevated concentrations of metal such as iron and aluminium which are harmful to farmed fish and shrimp. Acidification of pond soil causes recurrent fish and shrimp mortalities, poor growth rate in fish and shrimp, soft shell syndrome in shrimp and low plankton densities, Pond maintenance costs in ASS are also significantly higher than non-ASS ponds. There are over 6.7 million ha of ASS In Indonesia of which 35% has been developed for brackish water aquaculture. This study developed and trialled methods of soil remediation to restore abandoned ASS-affected ponds. The main objective was to develop methods at remediation that were scientifically sound but also practical and inexpensive for farmers. The research involved characterising, in detail, the chemical and physical properties of ponds soil followed by laboratory-based experiments to improve soil properties. The results of laboratory trials were the basis for large-scale field experiments to test soil remediation strategies. The study showed that pond bottoms could be improved by forced oxidation, flooding and water exchange followed by Iiming and fertilising. Up to 500% increases in productivity were achieved by this method and soils conditions Improved significantly. A further twofold productivity increase was achieved by an integrated liming method in which lime is added to rebuilt or new dykes in layers. A juvenile shrimp production system was developed for ponds that were too severely degraded or costly to remediate. The research developed methods of preventing metal toxicity in Juvenile shrimp. The study showed that aquaculture ponds built in ASS could be remediated and returned to viable production systems. Importantly, the study has developed a more detailed understanding of chemical properties In ASS-affected ponds.
APA, Harvard, Vancouver, ISO, and other styles
5

Reynolds, Jason Kurt Faculty of Science UNSW. "Hydrogel determined metal bioaccessibility in acid sulfate-affected landscapes." Awarded by:University of New South Wales, 2008. http://handle.unsw.edu.au/1959.4/41436.

Full text
Abstract:
Exposure of sulfidic sediments to atmospheric conditions can under various environmental and anthropogenic influences. The oxidation of sulfides results in the production of acidity, dissolution of aluminosilicates and pedogenci development. This process has acid sulfate landscapes throughout the world identified as major emitters of elevated concentrations of chemical metals. This emission of acidity and metals alters the bioaccessibility and subsequently has a deleterious impact on the surrounding biologic environment. Despite this, the examination of the biologic impact in these landscapes has received only minimal attention. Passive and dynamic hydrogel techniques were used to measure the bioaccessibility of metals in sediments and waters. The technique involved the construction of a restricted pore-size thin-film hydrogel that allowed for the diffusion of the bioaccessible fraction, composed of the free-ion and easily dissociable metal-complexes. The dynamic hydrogel technique contained a resin sink, which allowed for a time-integrated flux concentration to be calculated. The dynamic hydrogel technique was trialled and found to correlate with the pygmy mussel (Xenostrobus securis) aluminium uptake for short exposure periods (24 hours).The dynamic hydrogel metal concentration was also found to correlate to indpendantly measured pore water and simultaneously extracted metal (SEM) concentrations. The hydrogel techniqe was further applied to investigate the sediment-water interface in drained and non-drained acid suflate landscapes. The studied Australian and Finnish acid sulfate landscapes showed contrasting relationships between the acid volatile sulfides (AVS) and SEM fractions. In the Australian sediments, a conversion of AVS-S to FeS2-S occurs with depth driven by a polysulfide pathway, whilst the Finnish sediments displayed a persistence of AVS-S with depth with limited conversion to FeS2-S. Distinct variations exist at the sediment-water interface of the two contrasting landscapes, with AVS-S to FeS2-S ratios of 2.5 for the Australian and 0.2 in the Finnish sediments. The sediment geochemistry regulated metal mobility. A two-dimensional passive and dynamic hydrogel approach illustrated microniches and supply zones of aluminium iron, manganese and zinc at varying depths near the sediment-water interface. The measurement of bioaccessibility using an in situ technique in acid sulfate landscapes is a first for both Australia and Finland, and this research provides an important avenue for future water and sediment quality monitoring.
APA, Harvard, Vancouver, ISO, and other styles
6

Bryson, Autumn Leah. "Sulfate sorption of acidified forest soils in the Otter Creek Wilderness area." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4900.

Full text
Abstract:
Thesis (M.S.)--West Virginia University, 2006.
Title from document title page. Document formatted into pages; contains vi, 36 p. : ill. (some col.), col. maps. Includes abstract. Includes bibliographical references (p. 31-36).
APA, Harvard, Vancouver, ISO, and other styles
7

Belkacem, Saïd. "Étude de la restauration des sols acides soumis à de forts apports acides : effet des formes et doses d'amendements sur le fonctionnement d'un sol acide forestier." Nancy 1, 1993. http://www.theses.fr/1993NAN10282.

Full text
Abstract:
La restauration des sols forestiers acides et leur dynamique sont abordées par l'étude des effets des formes et quantités d'amendements apportés, en interaction avec la qualité de l'humus. Le caco#3, caco#3+mgo et caso#4 sont apportés en surface avec des doses de 0, 0. 56, 2. 8 et 5. 6 t/ha équivalent cao et les principaux résultats sont: le sol: la valeur du ph du sol est augmentée de 4 unités ph dans les couches de surface (a#1) et d'une unité ph en moyenne en profondeur (b) avec les amendements carbonates. La restauration a été rapide (moins de 7 mois) dans les premiers centimètres du sol avec une migration également de particules de carbonates (>40% du ca) de la litière vers la couche a#1#1 (-3 cm). La saturation n'est pas modifiée dans les couches inferieures du (b) (16 a 21 cm), sauf pour la forme sulfate où elle a augmente de 50% par rapport au témoin. Les mécanismes d'échanges de l'aluminium par le calcium expliquent ces changements sur les surfaces d'échange; la solution du sol: par rapport au témoin, la composition des eaux a été modifiée rapidement (2 mois) par le sulfate avec un enrichissement du flux d'aluminium et de calcium. L'effet des carbonates sur la solution, sous (b) (-21 cm), a été moins rapide (7 mois). Les analyses des eaux montrent une modification de la dynamique de l'azote. Dans le traitement carbonate le mécanisme reste le même et l'anion dominant est le nitrate. Dans le traitement caso#4, l'anion vecteur est le sulfate, 52% de l'azote d'azote est transporté hors du profil sous forme d'ammonium
APA, Harvard, Vancouver, ISO, and other styles
8

Gunnarsson, Niklas. "Mineralogical speciation of sulfur in acid sulfate soils from Luleå, Sweden." Thesis, Luleå tekniska universitet, Geovetenskap och miljöteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-71759.

Full text
Abstract:
Marine sulfide – bearing sediments that oxidize when in contact with oxygen and leach outelements in high concentrations to small watercourses have been a problem for many years allover the world especially around the Bothnian Bay. The purpose of this study was to furtherinvestigate the sulfur mineralogy present in acid sulfate soils in the area of Luleå, Sweden. Asecondary aim was to see if elements leach out and accumulate in an acid sulfate soil closer tothe recipient. Samples were taken in two profiles (one oxidized and one waterlogged) fromfour sites (sites A-D) and were analyzed for whole rock geochemistry. Two sites were furtherinvestigated for mineralogy in polished samples with an optical microscope, Ramanspectroscopy and SEM-EDS. Each profile consisted of three layers: oxidation zone, transitionzone and reduced zone. The oxidation zone above the groundwater table was light grey withbrown iron hydroxide staining. Parts that lied under the water table were dark grey-black within general strong odor (“rotten eggs”) due to its sulfur content. It was usually straightforwardto distinguish and separate the layers from each other directly in the field, however in somecases pH was needed for confirmation.A general feature of investigated polished samples is the presence of abundant framboidalpyrites that are common in reduced marine sediments. The transition zone was formed in suboxicconditions and this feature is reflected by the mineralogy. Many morphologies of theframboidal pyrite were observed in this layer and signs of both dissolution and formationoccur. In the sample from site C one could observe elemental sulfur in form of large (up to 50μm) euhedral crystals. In the samples with pH<4, no sulfides occur as they have been replacedby jarosite (site B). Site C lacks these sulfur-bearing hydroxides which is thought to be due toa sulfur concentration of <0.2 %. Sulfur shows extensive leaching at most sites but at site B andD1, it accumulates in the transition zone. Elements like cobalt (Co), nickel (Ni) and zinc (Zn)are leached out or are accumulated further down in the profile. Elements that could have beentransported and have accumulated in the waterlogged profiles are Co, Ni, Zn and chromium(Cr) and in some profiles also copper (Cu) and vanadium (V).
Coastal watercourses in Bottenviken: Method development and ecological restoration- A cross-border Swedish-Finnish cooperation project
APA, Harvard, Vancouver, ISO, and other styles
9

Banasiak, Laura Joan. "The role of a subsurface lime-fly ash barrier in the mitigation of acid sulphate soils." Access electronically, 2004. http://www.library.uow.edu.au/adt-NWU/public/adt-NWU20050706.121221/index.html.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Nguyen, Nga. "Multivariate analysis and GIS in generating vulnerability map of acid sulfate soils." Thesis, KTH, Mark- och vattenteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170472.

Full text
Abstract:
The study employed multi-variate methods to generate vulnerability maps for acid sulfate soils (AS) in the Norrbotten county of Sweden. In this study, the relationships between the reclassified datasets and each biogeochemical element was carefully evaluated with ANOVA Kruskal Wallis and PLS analysis. The sta-tistical results of ANOVA Kruskall-Wallis provided us a useful knowledge of the relationships of the preliminary vulnerability ranks in the classified datasets ver-sus the amount of each biogeochemical element. Then, the statistical knowledge and expert knowledge were used to generate the final vulnerability ranks of AS soils in the classified datasets which were the input independent variables in PLS analyses. The results of Kruskal-Wallis one way ANOVA and PLS analyses showed a strong correlation of the higher levels total Cu2+, Ni2+ and S to the higher vulnerability ranks in the classified datasets. Hence, total Cu2+, Ni2+ and S were chosen as the dependent variables for further PLS analyses. In particular, the Variable Importance in the Projection (VIP) value of each classified dataset was standardized to generate its weight. Vulnerability map of AS soil was a result of a lineal combination of the standardized values in the classified dataset and its weight. Seven weight sets were formed from either uni-variate or multi-variate PLS analyses. Accuracy tests were done by testing the classification of measured pH values of 74 soil profiles with different vulnerability maps and evaluating the areas that were not the AS soil within the groups of medium to high AS soil probability in the land-cover and soil-type datasets. In comparison to the other weight sets, the weight set of multi-variate PLS analysis of the matrix of total Ni2+& S or total Cu2+& S had the robust predictive performance. Sensitivity anal-ysis was done in the weight set of total Ni2+& S, and the results of sensitivity analyses showed that the availability of ditches, and the change in the terrain sur-faces, the altitude level, and the slope had a high influence to the vulnerability map of AS soils. The study showed that using multivariate analysis was a very good approach methodology for predicting the probability of acid sulfate soil.
APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Acide sulfate soils"

1

Acid sulfate soils in Malaysia. Serdang: Universiti Putera Malaysia Press, 2006.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Võ, Quang Minh, Thị Gương Võ, and Mỹ Hoa Nguyễn. Một số kết quả nghiên cứu về sử dụng và quản lý đất phèn ở Đồng bằng Sông Cửu Long. TP. [i.e. Thành phố] Hồ Chí Minh: Nhà xuất bản Nông nghiệp, 2010.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Nichnadowicz, Vincent F. Mitigation of acid-producing soils: Final report. [Trenton, NJ]: The Dept., 2003.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Jacobs, James A., Jay H. Lehr, and Stephen M. Testa, eds. Acid Mine Drainage, Rock Drainage, and Acid Sulfate Soils. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118749197.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Colley, Raymond. Constraints imposed by acid sulfate soils on the Gambia's bridge-barrage scheme. Ann Arbor, Mich: Great Lakes and Marine Waters Center, University of Michigan, 1985.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Boivin, Pascal. Caractérisation physique des sols sulfatés acides de la vallée de Katouré, Basse Casmance, Sénégal : étude de la variabilité spatiale et relation avec les caractériques pédologiques. Paris: Editions de l'ORSTOM, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Krasilʹnikov, P. V. Sulʹfatnokislye pochvy vostochnoĭ Fennoskandii (na vneberegovykh otlozhenii͡a︡kh). Petrozavodsk: Rossiĭskai͡a︡ akademii͡a︡ nauk, Karelʹskiĭ nauch. t͡s︡entr in-t biologii, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Dent, David. Quick quantitative assessment of the acid sulphate hazard. Glen Osmond, S. Aust: CSIRO Division of Soils, 1996.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Simposium, Nasional Pendayagunaan Tanah Masam (2003 Bandar Lampung Indonesia and Lampung Timur Indonesia). Prosiding. Bogor: Pusat Penelitian dan Pengembangan Tanah dan Agroklimat, Badan Penelitian dan Pengembangan Pertanian, Departemen Pertanian, 2004.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Ohmann, L. F. Properties of soils and tree wood tissue across a Lake States sulfate deposition gradient. St. Paul, Minn: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Acide sulfate soils"

1

Jacobs, James A. "Acid Sulfate Soils." In Acid Mine Drainage, Rock Drainage, and Acid Sulfate Soils, 191–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118749197.ch16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

van Mensvoort, M. E. F., and D. L. Dent. "Acid Sulfate Soils." In Methods for Assessment of Soil Degradation, 301–35. Boca Raton: CRC Press, 2020. http://dx.doi.org/10.1201/9781003068716-16.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Osman, Khan Towhid. "Acid Soils and Acid Sulfate Soils." In Management of Soil Problems, 299–332. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75527-4_11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Fanning, D. S., and S. N. Burch. "Coastal Acid Sulfate Soils." In Agronomy Monographs, 921–37. Madison, WI, USA: American Society of Agronomy, Crop Science Society of America, Soil Science Society of America, 2015. http://dx.doi.org/10.2134/agronmonogr41.c36.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Fanning, D. S., M. C. Rabenhorst, and J. M. Bigham. "Colors of Acid Sulfate Soils." In Soil Color, 91–108. Madison, WI, USA: Soil Science Society of America, 2015. http://dx.doi.org/10.2136/sssaspecpub31.c6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Jacobs, James A., and Stephen M. Testa. "Acid Drainage and Sulfide Oxidation: Introduction." In Acid Mine Drainage, Rock Drainage, and Acid Sulfate Soils, 1–8. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118749197.ch1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Jacobs, James A. "Overview of Soil and Groundwater Sampling Methods for Acid Drainage Studies." In Acid Mine Drainage, Rock Drainage, and Acid Sulfate Soils, 119–22. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118749197.ch10.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Downing, Bruce W. "Acid Drainage Sampling Design and Sample Preparation." In Acid Mine Drainage, Rock Drainage, and Acid Sulfate Soils, 123–30. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118749197.ch11.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Neuman, Dennis R., Stuart R. Jennings, and James A. Jacobs. "Acid Drainage and Aquatic Resources." In Acid Mine Drainage, Rock Drainage, and Acid Sulfate Soils, 131–37. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118749197.ch12.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Neuman, Dennis R., Peter J. Brown, and Stuart R. Jennings. "Metals Associated with Acid Rock Drainage and Their Effect on Fish Health and Ecosystems." In Acid Mine Drainage, Rock Drainage, and Acid Sulfate Soils, 139–69. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118749197.ch13.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Acide sulfate soils"

1

Sadao Nagasaka, Eiichi Kohno, Wesley W Wallender, Dong-Jin Kang, Shingo Ueda, Shigeo Ishikawa, and Pisoot Vijarnsorn. "Improvement of Leaching Methods for Acid Sulfate Soil." In 2009 Reno, Nevada, June 21 - June 24, 2009. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2009. http://dx.doi.org/10.13031/2013.27425.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kopackova, Veronika. "Mapping Acid Mine Drainage (AMD) and Acid Sulfate Soils Using Sentinel-2 Data." In IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2019. http://dx.doi.org/10.1109/igarss.2019.8900505.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Pathirage, Udeshini, and Buddhima Indraratna. "A Permeable Reactive Barrier Installed in Acid Sulfate Soil Terrain." In Geo-Chicago 2016. Reston, VA: American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784480144.031.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Han, Fengxiang, Safwan Shiyab, Yi Su, David L. Monts, Charles A. Waggoner, and Frank B. Matta. "Bioavailability and Stability of Mercury Sulfide in Armuchee (USA) Soil." In The 11th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2007. http://dx.doi.org/10.1115/icem2007-7122.

Full text
Abstract:
Because of the adverse effects of elemental mercury and mercury compounds upon human health, the U.S. Department of Energy (DOE) is engaged in an on-going effort to monitor and remediate mercury-contaminated DOE sites. In order to more cost effectively implement those extensive remediation efforts, it is necessary to obtain an improved understanding of the role that mercury and mercury compounds play in the ecosystem. We have conducted pilot scale experiments to study the bioavailability of mercury sulfide in an Armuchee (eastern US) soil. The effects of plants and incubation time on chemical stability and bioavailability of HgS under simulated conditions of the ecosystem have been examined, as has the dynamics of the dissolution of mercury sulfide by various extractants. The results show that mercury sulfide in contaminated Armuchee soil was still to some extent bioavailable to plants. After planting, soil mercury sulfide is more easily dissolved by both 4 M and 12 M nitric acid than pure mercury sulfide reagent. Dissolution kinetics of soil mercury sulfide and pure chemical reagent by nitric acid are different. Mercury release by EDTA from HgS-contaminated soil increased with time of reaction and soil mercury level. Chelating chemicals increase the solubility and bioavailability of mercury in HgS-contaminated soil.
APA, Harvard, Vancouver, ISO, and other styles
5

Shi, Xianzhong, Mehrooz Aspandiar, and Ian C. Lau. "Assessment of acid sulfate soil using hyperspectral data in South Yunderup, Western Australia." In IGARSS 2013 - 2013 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2013. http://dx.doi.org/10.1109/igarss.2013.6723790.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

"Potential of controlled drainage and sub-irrigation to manipulate groundwater table for mitigating acid loadings in Finnish acid sulfate soils." In 2016 10th International Drainage Symposium. American Society of Agricultural and Biological Engineers, 2016. http://dx.doi.org/10.13031/ids.20162521555.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Jumar, Riza Adrianoor Saputra, Muhammad Imam Nugraha, and Ahmad Ghazali. "The effect of composted oyster mushroom baglog waste on rice growth and productivity in acid sulfate soils." In THE 5th INTERNATIONAL CONFERENCE ON AGRICULTURE AND LIFE SCIENCE 2021 (ICALS 2021): “Accelerating Transformation in Industrial Agriculture Through Sciences Implementation”. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0116297.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Vasquez, P., J. Urich, A. Rodriguez, V. Gonzalez, J. Marcano, C. Lopez, and P. Colombo. "Edafic and Successional Changes Generated by Drill Wastes Application in Acid-sulfate Soils at the Upper Orinoco Delta." In SPE International Conference on Health, Safety, and Environment in Oil and Gas Exploration and Production. Society of Petroleum Engineers, 1998. http://dx.doi.org/10.2118/48922-ms.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Banasiak, Laura, Punyama Pathirage, and Buddhima Indraratna. "Modeling of Chemical Armoring in a Permeable Reactive Barrier (PRB) in Acid Sulfate Soil (ASS) Terrain." In International Conference on Ground Improvement & Ground Control. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-3560-9_05-0501.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Taufieq, Nur Anny Suryaningsih, Sahibin Abdul Rahim, and Habibah Jamil. "Effectiveness of the bran media and bacteria inoculum treatments in increasing pH and reducing sulfur-total of acid sulfate soils." In THE 2013 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2013 Postgraduate Colloquium. AIP Publishing LLC, 2013. http://dx.doi.org/10.1063/1.4858728.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Acide sulfate soils"

1

Berkowitz, Jacob, and Christine VanZomeren. Approaches to identify and monitor for potential acid sulfate soils in an ecological restoration context. Engineer Research and Development Center (U.S.), February 2022. http://dx.doi.org/10.21079/11681/43349.

Full text
Abstract:
Potential acid sulfate soils include materials with the capacity to generate acidity under certain environmental conditions. As such, these soils can pose challenges to ecological restoration projects occurring in wetlands and nearshore environments. To provide guidance for ecosystem restoration practitioners, the following technical note describes acid sulfate soil formation and distribution and then describes techniques for identifying and monitoring acid sulfate soil conditions prior to and following implementation of restoration activities. Finally, this technical note outlines a number of tools and recently published resources to help avoid unintended consequences of acid sulfate soil disturbance and achieve ecological restoration objectives.
APA, Harvard, Vancouver, ISO, and other styles
2

Shenker, Moshe, Paul R. Bloom, Abraham Shaviv, Adina Paytan, Barbara J. Cade-Menun, Yona Chen, and Jorge Tarchitzky. Fate of Phosphorus Originated from Treated Wastewater and Biosolids in Soils: Speciation, Transport, and Accumulation. United States Department of Agriculture, June 2011. http://dx.doi.org/10.32747/2011.7697103.bard.

Full text
Abstract:
Beneficial use of reclaimed wastewater (RW) and biosolids (BS) in soils is accompanied by large input of sewage-originated P. Prolonged application may result in P accumulation up to levelsBeneficial use of reclaimed wastewater (RW) and biosolids (BS) in soils is accompanied by large input of sewage-originated P. Prolonged application may result in P accumulation up to levels that impair plant nutrition, increase P loss, and promote eutrophication in downstream waters. This study aims to shed light on the RW- and BS-P forms in soils and to follow the processes that determine P reactivity, solubility, availability, and loss in RW and BS treated soils. The Technion group used sequential P extraction combined with measuring stable oxygen isotopic composition in phosphate (δ18OP) and with 31P-NMR studies to probe P speciation and transformations in soils irrigated with RW or fresh water (FW). The application of the δ18OP method to probe inorganic P (Pi) speciation and transformations in soils was developed through collaboration between the Technion and the UCSC groups. The method was used to trace Pi in water-, NaHCO3-, NaOH-, and HCl- P fractions in a calcareous clay soil (Acre, Israel) irrigated with RW or FW. The δ18OP signature changes during a month of incubation indicated biogeochemical processes. The water soluble Pi (WSPi) was affected by enzymatic activity yielding isotopic equilibrium with the water molecules in the soil solution. Further it interacted rapidly with the NaHCO3-Pi. The more stable Pi pools also exhibited isotopic alterations in the first two weeks after P application, likely related to microbial activity. Isotopic depletion which could result from organic P (PO) mineralization was followed by enrichment which may result from biologic discrimination in the uptake. Similar transformations were observed in both soils although transformations related to biological activity were more pronounced in the soil treated with RW. Specific P compounds were identified by the Technion group, using solution-state 31P-NMR in wastewater and in soil P extracts from Acre soils irrigated by RW and FW. Few identified PO compounds (e.g., D-glucose-6-phosphate) indicated coupled transformations of P and C in the wastewater. The RW soil retained higher P content, mainly in the labile fractions, but lower labile PO, than the FW soil; this and the fact that P species in the various soil extracts of the RW soil appear independent of P species in the RW are attributed to enhanced biological activity and P recycling in the RW soil. Consistent with that, both soils retained very similar P species in the soil pools. The HUJ group tested P stabilization to maximize the environmental safe application rates and the agronomic beneficial use of BS. Sequential P extraction indicated that the most reactive BS-P forms: WSP, membrane-P, and NaHCO3-P, were effectively stabilized by ferrous sulfate (FeSul), calcium oxide (CaO), or aluminum sulfate (alum). After applying the stabilized BS, or fresh BS (FBS), FBS compost (BSC), or P fertilizer (KH2PO4) to an alluvial soil, P availability was probed during 100 days of incubation. A plant-based bioassay indicated that P availability followed the order KH2PO4 >> alum-BS > BSC ≥ FBS > CaO-BS >> FeSul-BS. The WSPi concentration in soil increased following FBS or BSC application, and P mineralization further increased it during incubation. In contrast, the chemically stabilized BS reduced WSPi concentrations relative to the untreated soil. It was concluded that the chemically stabilized BS effectively controlled WSPi in the soil while still supplying P to support plant growth. Using the sequential extraction procedure the persistence of P availability in BS treated soils was shown to be of a long-term nature. 15 years after the last BS application to MN soils that were annually amended for 20 years by heavy rates of BS, about 25% of the added BS-P was found in the labile fractions. The UMN group further probed soil-P speciation in these soils by bulk and micro X-ray absorption near edge structure (XANES). This newly developed method was shown to be a powerful tool for P speciation in soils. In a control soil (no BS added), 54% of the total P was PO and it was mostly identified as phytic acid; 15% was identified as brushite and 26% as strengite. A corn crop BS amended soil included mostly P-Fe-peat complex, variscite and Al-P-peat complex but no Ca-P while in a BS-grass soil octacalcium phosphate was identified and o-phosphorylethanolamine or phytic acid was shown to dominate the PO fraction that impair plant nutrition, increase P loss, and promote eutrophication in downstream waters. This study aims to shed light on the RW- and BS-P forms in soils and to follow the processes that determine P reactivity, solubility, availability, and loss in RW and BS treated soils. The Technion group used sequential P extraction combined with measuring stable oxygen isotopic composition in phosphate (δ18OP) and with 31P-NMR studies to probe P speciation and transformations in soils irrigated with RW or fresh water (FW). The application of the δ18OP method to probe inorganic P (Pi) speciation and transformations in soils was developed through collaboration between the Technion and the UCSC groups. The method was used to trace Pi in water-, NaHCO3-, NaOH-, and HCl- P fractions in a calcareous clay soil (Acre, Israel) irrigated with RW or FW. The δ18OP signature changes during a month of incubation indicated biogeochemical processes. The water soluble Pi (WSPi) was affected by enzymatic activity yielding isotopic equilibrium with the water molecules in the soil solution. Further it interacted rapidly with the NaHCO3-Pi. The more stable Pi pools also exhibited isotopic alterations in the first two weeks after P application, likely related to microbial activity. Isotopic depletion which could result from organic P (PO) mineralization was followed by enrichment which may result from biologic discrimination in the uptake. Similar transformations were observed in both soils although transformations related to biological activity were more pronounced in the soil treated with RW. Specific P compounds were identified by the Technion group, using solution-state 31P-NMR in wastewater and in soil P extracts from Acre soils irrigated by RW and FW. Few identified PO compounds (e.g., D-glucose-6-phosphate) indicated coupled transformations of P and C in the wastewater. The RW soil retained higher P content, mainly in the labile fractions, but lower labile PO, than the FW soil; this and the fact that P species in the various soil extracts of the RW soil appear independent of P species in the RW are attributed to enhanced biological activity and P recycling in the RW soil. Consistent with that, both soils retained very similar P species in the soil pools. The HUJ group tested P stabilization to maximize the environmental safe application rates and the agronomic beneficial use of BS. Sequential P extraction indicated that the most reactive BS-P forms: WSP, membrane-P, and NaHCO3-P, were effectively stabilized by ferrous sulfate (FeSul), calcium oxide (CaO), or aluminum sulfate (alum). After applying the stabilized BS, or fresh BS (FBS), FBS compost (BSC), or P fertilizer (KH2PO4) to an alluvial soil, P availability was probed during 100 days of incubation. A plant-based bioassay indicated that P availability followed the order KH2PO4 >> alum-BS > BSC ≥ FBS > CaO-BS >> FeSul-BS. The WSPi concentration in soil increased following FBS or BSC application, and P mineralization further increased it during incubation. In contrast, the chemically stabilized BS reduced WSPi concentrations relative to the untreated soil. It was concluded that the chemically stabilized BS effectively controlled WSPi in the soil while still supplying P to support plant growth. Using the sequential extraction procedure the persistence of P availability in BS treated soils was shown to be of a long-term nature. 15 years after the last BS application to MN soils that were annually amended for 20 years by heavy rates of BS, about 25% of the added BS-P was found in the labile fractions. The UMN group further probed soil-P speciation in these soils by bulk and micro X-ray absorption near edge structure (XANES). This newly developed method was shown to be a powerful tool for P speciation in soils. In a control soil (no BS added), 54% of the total P was PO and it was mostly identified as phytic acid; 15% was identified as brushite and 26% as strengite. A corn crop BS amended soil included mostly P-Fe-peat complex, variscite and Al-P-peat complex but no Ca-P while in a BS-grass soil octacalcium phosphate was identified and o-phosphorylethanolamine or phytic acid was shown to dominate the PO fraction.
APA, Harvard, Vancouver, ISO, and other styles
3

VanZomeren, Christine, Jacob Berkowitz, Candice Piercy, and Jeffrey King. Acid sulfate soils in coastal environments : a review of basic concepts and implications for restoration. Engineer Research and Development Center (U.S.), September 2020. http://dx.doi.org/10.21079/11681/38240.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova, and Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

Full text
Abstract:
The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography