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ETUDE DE LA REACTIVITE ET DU TRANSFERT DU TRIBUTYLETAIN ET DU MERCURE DANS LES ENVIRONNEMENTS AQUATIQUES

Abstract : Aquatic ecosystems are particularly affected by tributyltin (TBT) and mercury (Hg) chronic contamination. These micropollutants are ubiquitous and persistent and occurred at trace level, likely to drastically impair aquatic environments. TBT and Hg biogeochemical cycles are driven by transformation and transfer mechanisms between the different environmental compartments. These natural processes have been studied in details by using novel analytical methods and environmental design to improve the risk assessment. The first part of this work focus on the mechanistic study of TBT and Hg reactivity and transfer in reconstituted aquatic ecosystems. These experiments involve both state-of-the-art analytical speciation techniques, partly based on quantification by isotopic dilution and experimental tools simulating the environmental conditions. Kinetics of TBT and Hg distribution (adsorption, bioaccumulation, biodegradation, clearance) have been simultaneously characterized in al compartments of the microcosms presenting a simple biological organization. In a second step, volatilization kinetics of TBT at real interfaces have been studied to assess the potential remobilization and elimination pathways of butyltin compounds. Finally, in a third part, stable isotopic tracers of Hg have been employed to discriminate and quantify the coupled methylation and demethylation kinetics in estuarine sediments, by forcing different environmental factors (oxygenation, microbial activity).
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https://tel.archives-ouvertes.fr/tel-00010071
Contributor : Emmanuel Tessier <>
Submitted on : Wednesday, September 14, 2005 - 11:35:28 AM
Last modification on : Friday, January 15, 2021 - 9:22:05 AM
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E. Tessier. ETUDE DE LA REACTIVITE ET DU TRANSFERT DU TRIBUTYLETAIN ET DU MERCURE DANS LES ENVIRONNEMENTS AQUATIQUES. Autre. Université de Pau et des Pays de l'Adour, 2004. Français. ⟨tel-00010071⟩

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