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<dc:title xml:lang="en">Transport and degradation of pesticides in wetland systems : a downscaling approach</dc:title>
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<dc:subject xml:lang="fr">Zones humides</dc:subject>
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<dc:subject xml:lang="fr">Molécules chirales</dc:subject>
<dc:subject xml:lang="fr">Produits de dégradation</dc:subject>
<dc:subject xml:lang="fr">Conditions d’oxydo-réduction</dc:subject>
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<dc:subject xml:lang="fr">Analyses chirales</dc:subject>
<dc:subject xml:lang="fr">Analyses isotopiques</dc:subject>
<dc:subject xml:lang="en">Wetland systems</dc:subject>
<dc:subject xml:lang="en">Emerging pesticides</dc:subject>
<dc:subject xml:lang="en">Chiral molecules</dc:subject>
<dc:subject xml:lang="en">Degradation products</dc:subject>
<dc:subject xml:lang="en">Redox conditions</dc:subject>
<dc:subject xml:lang="en">Hydrological conditions</dc:subject>
<dc:subject xml:lang="en">Enantiomeric analyses</dc:subject>
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<tef:elementdEntree autoriteExterne="02807307X" autoriteSource="Sudoc">Zones humides</tef:elementdEntree>
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<tef:elementdEntree autoriteExterne="027226085" autoriteSource="Sudoc">Mécanique des fluides</tef:elementdEntree>
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<dcterms:abstract xml:lang="fr">La compréhension des mécanismes de transport et de dégradation des pesticides émergents est primordiale pour prédire leur devenir dans l’environnement. Les zones humides peuvent intercepter des eaux de ruissellement ou des souterraines contaminées par les pesticides et les traiter par le biais de processus de rétention et de dégradation, encore peu connus. Dans une approche multi-échelles, trois zones humides recevant des eaux polluées par les pesticides ont été utilisées comme des « laboratoires naturels » pour étudier le devenir de pesticides couramment utilisés. Cette thèse souligne l’influence des conditions hydrologiques et redox sur la distribution des pesticides au sein des différents compartiments des zones humides ainsi que sur leur potentiel de dégradation. Alors que les études à grande échelle fournissent des informations intégratives sur la dissipation et la rétention des pesticides en lien avec le développement de la végétation, les études à petite échelle utilisant des techniques innovantes telles que les analyses isotopiques et énantiomériques permettent l’exploration des processus moléculaires de dégradation des pesticides.</dcterms:abstract>
<dcterms:abstract xml:lang="en">A mechanistic understanding of transport and degradation processes of modern agricultural pesticides, including chiral pesticides, is critical for predicting their fate in the environment. In agricultural landscapes, wetlands can intercept pesticide-contaminated runoff or groundwater and improve water quality through various retention and degradation processes, which remain unknown. In a downscaling approach, three different wetlands receiving agricultural runoff were used as ‘natural laboratories’ to investigate the fate of widely used pesticides. Overall, our results showed that dynamics of hydrological and redox conditions largely influenced pesticide sorption mechanisms and their distribution over time within wetland compartments, thereby controlling degradation processes. While large-scale studies provide integrative information on pesticide dissipation and distribution patterns with respect to wetland functioning, small-scale investigations using novel methods such as isotope and enantiomer analyses characterize underlying molecular processes governing pesticide degradation.</dcterms:abstract>
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