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Artykuły w czasopismach na temat "Éléments traces – Environnement"
Ferdinand, Yao Diby, Assale Fori Jean Paul, Alla Amani Jonas i Digbehi Zeli Bruno. "Caracterisasion Geochimique des Deblais du Substratum de la Baie du Banco, Abidjan, Basse Cote d‘Ivoire". European Scientific Journal, ESJ 19, nr 36 (31.12.2023): 124. http://dx.doi.org/10.19044/esj.2023.v19n36p124.
Pełny tekst źródłaFillières-Riveau, Gauthier, Jean-Marie Favreau, Vincent Barra i Guillaume Touya. "Génération de cartes tactiles photoréalistes pour personnes déficientes visuelles par apprentissage profond". Revue Internationale de Géomatique 30, nr 1-2 (styczeń 2020): 105–26. http://dx.doi.org/10.3166/rig.2020.00104.
Pełny tekst źródłaWien, Thomas. "« Les travaux pressants ». Calendrier agricole, assolement et productivité au Canada au XVIIIe siècle". Revue d'histoire de l'Amérique française 43, nr 4 (24.09.2008): 535–58. http://dx.doi.org/10.7202/304839ar.
Pełny tekst źródłaLEHMER, Oumaima, i Abderrazak El ABBADI. "Une expansion de l’économie vers l’environnement". International Journal of Financial Accountability, Economics, Management, and Auditing (IJFAEMA) 3, nr 5 (2.10.2021): 875–82. http://dx.doi.org/10.52502/ijfaema.v3i5.144.
Pełny tekst źródłaFigueroa Serrano, David. "El agua en la percepción mazahua: Ecofilosofía y narrativa de la naturaleza / Water in Mazahua perception: Ecophilosophy and narrative of nature". Revista Trace, nr 78 (31.07.2020): 154. http://dx.doi.org/10.22134/trace.78.2020.593.
Pełny tekst źródłaGOURLEZ, EMMA, Fabrice BÉLINE, Jean-Yves DOURMAD, Alessandra MONTEIRO i Francine DE QUELEN. "Rôle et impact environnemental du cuivre et du zinc en élevage porcin : de l’alimentation au retour au sol des effluents". INRAE Productions Animales 35, nr 2 (26.08.2022): 91–108. http://dx.doi.org/10.20870/productions-animales.2022.35.2.7073.
Pełny tekst źródłaHameau, Philippe. "Geste graphique et technicité". Anthropologie et Sociétés 36, nr 3 (19.02.2013): 57–75. http://dx.doi.org/10.7202/1014165ar.
Pełny tekst źródłaBodjona, Magnoudewa Bassai, Massama-Esso N'goumtete, Diheenane Diyakadola Bafai, Awedeou Kedjeba, Gado Tchangbedji i Biritandjoma Ezekias Batako. "Production artisanale de biochar à partir des tiges de cotonniers du Togo : Analyse de sa qualité pour sa valorisation en amendement organiques". International Journal of Biological and Chemical Sciences 17, nr 7 (22.02.2024): 2958–70. http://dx.doi.org/10.4314/ijbcs.v17i7.27.
Pełny tekst źródłaCoulibaly, AS, S. Monde, AY N'guessan i K. Aka. "Spéciation chimique des éléments traces métalliques dans un environnement lagunaire confiné: La baie de Bietry". International Journal of Biological and Chemical Sciences 5, nr 6 (1.06.2012). http://dx.doi.org/10.4314/ijbcs.v5i6.33.
Pełny tekst źródłaBertrand, Laurence, Catherine Chabot, Mélissa Di Sante, Angèle Bilodeau i Louise Potvin. "Les pratiques de l’action intersectorielle locale pour l’équité en santé : étude du cas Quartier nourricier de la Corporation de développement communautaire Centre-Sud à Montréal". Global Health Promotion, 7.12.2023. http://dx.doi.org/10.1177/17579759231211229.
Pełny tekst źródłaRozprawy doktorskie na temat "Éléments traces – Environnement"
Lévèque, Thibaut. "Biomonitoring environnemental et sanitaire des sols pollués par les éléments traces métalliques". Thesis, Toulouse, INPT, 2014. http://www.theses.fr/2014INPT0093/document.
Pełny tekst źródłaIn a context where environmental health concerns are globally increasing. Improve understanding of the mechanisms and bioavailability (eco) toxicity of persistent metals pollutants is a priority, especially because of their observed omnipresence in ecosystems in relation to their compartmentation and speciation. The earthworm is used to assess soil quality; moreover this soil organism through its bioturbation activities affects biogeochemical cycles. Ecotoxicity tests under controlled circumstances on earthworms have been conducted with different soils and worms’ species. Then an impact study on earthworms’ communities was conducted on a polluted site showing a concentration gradient. The influence of earthworms’ bioturbation on phytoavailability of pollutants was studied through experiments in mesocosms and Rhizotest. Finally, in vitro measures of pollutants bioavailability were performed on polluted soils and plants in different contexts: brownfields, gardens, sports field. The objective is to study the link between bioavailability for humans, soil characteristics, context of pollution and toxicity. Two complementary approaches have been developed: scientific research related to the mechanisms and development of tools, practical procedures which could be used by managers and risk assessors. Ecotoxicity of metals and metalloid (denoted ETM) on earthworms is not simply governed by their total concentrations, but strongly depends on the physico-chemical characteristics of soils. Furthermore, analysis of earthworm communities from a contaminated site can evaluate the quality of soil since seen an impact on the abundance, diversity and rate of juvenile worms. In addition, earthworms’ bioturbation significantly increases the bioavailability of ETM for vegetable plants such as lettuce. Finally, the human bioaccessibility of ETM is governed by many factors, in particular the context of pollution. The bioaccessible fraction of ETM is directly responsible for their cytotoxicity on intestinal cells. These results were complemented by mechanistic studies (IR, EXAFS, XANES, μ-XRF)
Alleman, Laurent. "Apport des isotopes stables du plomb au suivi des traces métalliques en Méditerranée et en Atlantique du Nord". Aix-Marseille 3, 1997. http://www.theses.fr/1997AIX30026.
Pełny tekst źródłaCoclet, Clément. "Impacts de la contamination multiple en éléments traces métalliques sur les communautés microbiennes dans un environnement côtier fortement anthropisé : la rade de Toulon". Electronic Thesis or Diss., Toulon, 2019. http://www.theses.fr/2019TOUL0010.
Pełny tekst źródłaToulon Bay is a highly anthropized coastal ecosystem that present multiple trace metal contamination gradients, and was considered as a model system. The coupling of field campaigns and laboratory experiments were used to study the impact of trace metal contamination on bath planktonic and biofilm microbial communities. Chemical analyses, flux cytometry, and metabarcoding were used to study several characteristics of communities, as abundance and taxonomie diversity in response to trace metal contamination in the Toulon Bay. Then, bath ultraphytoplankton and bacterioplankton showed strong spatial patterns along the trace metal contamination gradients. Laboratory experiments showed that trace metals played an important raie on bath abundance and diversity patterns of ultraplanktonic communities, by bath potential direct (toxicity) and indirect (phytoplankton-bacterioplankton interactions). Conversely to planktonic communities, trace metal contamination had limited impact on microbial biofilm community. ln contrast, microbial biofilm community seemed to be influenced by surrounding sediments, and by potential colonizer taxa from benthic compartment resuspended du ring sediment resuspension events. ln conclusion, trace metals seemed to have impacts on all the microbial communities of Toulon Bay, with variations of influence depending on the compartment
Abdul, Rida Abdul Motalibe Mohammad. "Biosurveillance de la contamination du sol : apport de l'étude des lombriciens à l'évaluation des risques liés aus éléments traces". Montpellier 2, 1992. http://www.theses.fr/1992MON20124.
Pełny tekst źródłaSchneider, Arnaud. "Comportement et mobilité des éléments traces métalliques dans des sols environnant une usine de seconde fusion du plomb. Approches expérimentales et modélisation". Electronic Thesis or Diss., Reims, 2016. http://www.theses.fr/2016REIMS043.
Pełny tekst źródłaThe soil contamination by trace elements (TE) is a major environmental issue which mainly lies in their potential transfers from soils to surface and ground waters and/or to food chain.The main objective of this study was to understand the behaviour of TE in impacted soils located in the vicinity of a lead-acid battery recycling plant (Ardennes, France). In a 17 ha surrounding area, the spatial distribution of TE was performed using portable X-ray fluorescence. It indicated that the soils were mainly contaminated by Pb and, to a lesser degree, by Cd, Cu, Ni, Sb, Sn and Zn. A geostatistical approach enabled to discriminate the natural or anthropogenic sources of most of these TE.Based on the TE mapping, the soil type and the land cover, the behaviour of the TE was studied along six soil profiles. The calculated partition coefficients highlighted a high mobility of the TE which is related to the acidic soil conditions (pH 4-5). Regardless of the studied soil profile, Cd exhibited the highest mobility, followed by Zn, Ni, Pb and Cu. A combined experimental (soil-column Donnan membrane technique) and modelling approach helped to specify that Cd, Ni and Zn occurred as free ions, Pb mainly occurred as free ion and associated to fulvic acids and Cu was mainly associated to fulvic acids in the soil solutions. The distribution of Pb among the soil components of upper soil horizons was also determined using chemical methods (sequential extraction), physical methods (SEM-EDS, Raman microspectroscopy) and modelling. Lead was mainly associated with soil organic matter and to a lesser extent with manganese oxides. None of the Pb-bearing phases potentially emitted by the recycling plant were identified, suggesting a remobilization of Pb in the studied soils after smelter particles deposition. This work emphasizes the importance of studying the soil and its solution to better understand the behaviour of TE, to assess the environmental risks and to suggest remediation strategies
Layglon, Nicolas. "Comportement des éléments traces métalliques lors de la remise en suspension de sédiments contaminés en zone côtière". Electronic Thesis or Diss., Toulon, 2020. http://www.theses.fr/2020TOUL0009.
Pełny tekst źródłaTrace metal elements entering marine environment accumulate in the sediments. In harbor areas, sediment can be resuspended in the water column following natural (swells, storms ...) and/or anthropic events (maritime traffic, dredging activity). In particular, the Mediterranean Sea represents a significant maritime trade route, generating frequent resuspension events of anthropic origin, while being slightly subjected to the influence of natural tidal phenomena. In this context, the objectives of this thesis consisted in evaluating the potential of trace elements during re-suspension events in order to provide knowledge that would help to better predict and thus better manage the associated risk. The kinetics of trace metal elements, studied in laboratory experiments, were specified in light of the variability of harbor contexts. During the first 5 days of suspension, trace elements transfers appeared mainly determined by abiotic processes. The understanding of these processes partially explained the field observations performed during an impact study of a dredging operation
Foulon, Julie. "Impact du phytomanagement de sites pollués par les éléments traces métalliques sur les micro-organismes du sol". Thesis, Besançon, 2016. http://www.theses.fr/2016BESA2090.
Pełny tekst źródłaAnthropogenic activities can cause dramatic changes in ecosystem structures and their ecological services. Phytomanagement based on the use of woody species can contribute to soil and microbial diversity restoration, while allowing the production of biomass of interest. As part of PROLIPHYT (2013-2018, ADEME), BIOFILTREE (2010-2014, ANR) and PHYTOPOP (2007-2011, ANR) projects, managed by the Chrono-environment laboratory, phytomanagement plots were installed on trace elements (TE) polluted sites to determine the growth potential of woody species and the recovery methods of biomass produced. In my PhD project, different approaches have been implemented to identify and characterize microorganisms subservient to implanted woody plants, with the aim of producing microbial resources to improve the recovery and growth of trees on polluted soil. The first approach was to study microbial communities in association with woody species by innovative high throughput sequencing approach associated with the physical and chemical analysis of soils. This method was developed and tested on three experimental sites contaminated by TE. It revealed changes in the structure and composition of microbial communities due to the nature of the vegetation cover and the soil characteristics (Zappelini et al., 2015; Foulon et al., 2016a; b). The second approach was to isolate and characterize mycorrhizal fungi and endophytes associated with poplars (Berthelot et al., 2016; Lacercat-Didier et al., 2016). These fungi are known to promote the growth of the plants they colonize but also to increase their TE tolerance. Several sampling campaigns of roots and sporocarps on different polluted sites have allowed the isolation of fungal strains tolerant to TE (like Serendipita vermifera) and enhancing growth (Phialophora sp. and Leptodontidium sp.). In a third approach, the mechanisms involved in TE resistance were studied i) in Paxillus involutus for Hg (Foulon et al. In prep) ii) by functional metatranscriptomics for Zn and Cd (Lehembre et al., 2013). In conclusion, this work allowed to i) improve our understanding of the impact of a woody cover on the structure and composition of microbial communities, and on the understanding of the physiological mechanisms involved ii) to constitute a collection of fungal strains that will be of great interest for future phytomanagement projects
Suaire, Rémi. "Dynamique de transfert des fondants routiers dans un bassin de rétention des eaux de ruissellement routières : vers une solution d’assainissement par phytoremédiation". Electronic Thesis or Diss., Université de Lorraine, 2015. http://www.theses.fr/2015LORR0116.
Pełny tekst źródłaDuring winter, deicing salts are spread on roads in order to preserve road safety for users. Under the influence of different parameters, these compounds are partly transferred to the environment, the rest of it being collected by the road runoff retention systems. However, road runoff retention ponds have not been designed for deicing salt treatment; they only play a role in the regulation of fluxes before their rejection into the environment. Furthermore, NaCl has a harmful impact on the environment, because of its toxicity to certain aquatic organisms and because it contributes to the increase of trace metal (TM) mobility, which are toxic as well. This shows the need for a specific treatment for these compounds. The objective of this research is to bring better understanding of deicing salt dynamics in a retention pond, but also to investigate the potential use of phytoremediation as a treatment solution for road runoff. A model retention pond was selected; it is located along a highway in Chenevières (Lorraine region, France). The first part of the work focused on the monitoring and the characterization of NaCl transfers in this pond. Water was weekly sampled for 3 years at the pond input and output and NaCl and TM concentrations were measured. Meteorological conditions and salt spreading data were monitored to appraise the salt fraction actually collected by the pond. Results showed that only 25 to 50 % of the spread salt is effectively collected. Moreover, results on NaCl dynamics proved that the pond only plays a role on transient storage and salt dilution before rejection into the environment. Moreover, measurements and analyses of sampled basin sediments and roadside soils were performed to assess speciation and TM mobility in this particular context. In this case, no significant effect of NaCl was recorded except for zinc (Zn); but major ions were mobilized. When it comes to treatments, conventional desalination technologies are too expensive and inappropriate in this context. Then, potentialities of phytodesalination were explored. Three halophyte plants were selected on the basis of specific criteria, allowing their use in road runoff context: Armeria maritima, Atriplex halimus and Atriplex hortensis L. Germination and growth experiments were run in various salinity conditions and in the presence/absence of Zn, in order to assess their tolerance to salt and Zn, as well as their accumulation abilities. These plants showed a high tolerance for NaCl in salinities in the range of those encountered in road runoff existing treatment systems at Chenevières. The three species accumulated significant amounts of NaCl and zinc in their aerial parts. The use of halophytes for phytodesalination of road runoff is a promising technique to address the issue of environmental impact of deicing salts
Cuvier, Alicia. "Accumulation de l'uranium, de ses descendants et des éléments traces métalliques dans les sols des zones humides autour des anciennes mines d'uranium". Thesis, Toulouse, INPT, 2015. http://www.theses.fr/2015INPT0104/document.
Pełny tekst źródłaUranium mining and uranium ore processing increase the environmental activity of U and Th decay products and trace elements, in particular in case of releases to the adjacent rivers. Contaminants accumulate then preferentially in sedimentation areas (such as ponds or lakes) or in wetlands (peatlands, marshes or riverbanks) located downstream to the mine. Wetlands – generally located at the head of watershed – are particularly sensitive to environmental changes and anthropogenic pressure. This poses a risk of release of contaminants from these accumulation areas. The objective of the present study is to propose an easily reproducible methodology – in particular for the orphan mining sites – to identify and characterize accumulation areas. This study also aims to improve our understanding of the mechanisms of accumulation and release, in these areas. This study was performed around the former mining site of Bertholène (France). Standing and mobile in situ gamma spectrometry is used to accurately locate the accumulation areas. Soils, sediments, vegetation, water and peat are also sampled upstream and downstream of the mine, in order to (a) characterize the activities and the disequilibria of the U-Th decay chains and the associated trace elements according to the scale of observation, (b) understand the mechanisms of accumulation and release and (c) identify the potential sources using geochemical proxies and isotopic analyses. The results obtained show that radionuclides are mainly accumulated in a flooding area located downstream the mine. Strong U-238 activities (> 20000 Bq.kg-1) and strong Ra-226/U-238 and Th-230/Ra-226 activity ratios are recorded, involving preferential inputs of U-238 and Th-230 during flooding events. Trace element contamination is low, except for Mn, Ba and S. Such contaminations are potentially explained by the geochemical composition of the uranium ore and by the past and current processes of ore and water mine. Sequential extractions highlight the importance of the acido-soluble and the amorphous oxides in the trapping of contaminants. Thus, pH or Eh potential changes could induce major releases of uranium to the environment. The large differences in Pb isotope composition between natural soils and uranium ores, as well the activity ratios of the U-238 and decay chain products, make these indicators helpful to identify the soils and the sediments impacted by uranium mining
Iqbal, Muhammad. "Impact de l'occupation des sols agricoles contaminés sur la disponibilité des éléments trace : Mise en évidence du role des matières organiques dans le cas de cultures annuelles et cultures pérennes à vocation énergétique". Electronic Thesis or Diss., Paris, AgroParisTech, 2012. http://www.theses.fr/2012AGPT0020.
Pełny tekst źródłaThe changes in land use of contaminated agricultural soils are susceptible to modify their trace metal availabilities by changing the quality and quantity of soil organic matter. But the role of soil organic matter in the determinism of trace metal availabilities in contaminated soils is not well known. The objective of the present study was to assess the role of soil organic matter in determinism of trace metal availabilities and their dynamics in contaminated soils varying in their texture and nature of pollution. A strategy of studying Cu, Pb, Zn and Cd availabilities of two sites with different texture and origin of pollution was adopted and the role of organic matter was assessed through; 1) sampling the soils of two parcels at each site with two different land uses i.e. under annual crop and under perennial energy crop miscanthus, 2) changing the soil organic matter of these soils through in vitro soil incubations. A combined approach of chemical metal extractions and metal localization study in different soil size fractions was used. The results of the trace metal availabilities of the soil under miscanthus compared to annual crop soil showed that the influence of changes in organic matter through land use was different at both sites. In the silty clayed soil, the availability of Cu and Pb which are the metals known to be preferentially bound to organic matter was decreased with an increase in their localization in soil finer fractions. In the site with organic matter rich sandy soils the availability of metals which are known to be bound to soil mineral phases i.e. Zn and Cd was changed without a change in their localization. The results of laboratory incubation experiments revealed that the mineralization of soil organic matter affects the trace metal availability in two ways. Cu and Zn availabilities are changed in all soils whatever the texture while Pb and Cd availabilities changed only in sandy soils. This difference of the change of metal availabilities in both cases of organic matter variations i.e. between the soil samples under different land use and in the samples of laboratory incubations can be explained by the fact that the changes in organic matter were not similar in both cases. Our work on the metal enriched particulate organic matter (POM) fractions, the most labile organic matter fractions showed that POM act as source and sink of the metals in our conditions and POM associated copper is bioavailable in liquid medium but its bioavailability is less than the metal added as salt solution. These results, increasing the understanding of the role of soil organic matter in the determinism of trace metal availability in different textured soils, are discussed
Części książek na temat "Éléments traces – Environnement"
Lamy, Isabelle, Thibault Sterckeman, Anne Jaffrezic, Anne Jaffrezic, Folkert Van Oort, Denis Baize, Rémi Chaussod, Laurence Denaix i Sophie Cornu. "Chapitre 24. Présence et impact des éléments en traces dans les sols". W Sols et environnement, 574–96. Dunod, 2011. http://dx.doi.org/10.3917/dunod.girar.2011.01.0574.
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