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Interactions dans un système césium, strontium/matière organique naturelle/argiles des sols

Abstract : This study is part of the DEMETERRES project, which aims to develop new methods and technologies in the field of decontamination and remediation of contaminated soils and effluents after a nuclear accident. The objective of this PhD is to obtain a better knowledge of 137Cs and 90Sr interactions onto agricultural soils and to better predict the chemical state of these elements in soils after a nuclear accident. A database in the multi-sites ion exchanger formalism has been built, reflecting the adsorption behaviours of Cs+ and Sr2+ onto illite and smectite (two major clay minerals) with regards to major environmental cations: i.e. H+, Na+, and Ca2+. It was used to predict the adsorption of Cs+ and Sr2+ onto French agricultural soil samples (Pusignan, Etoile-sur-Rhône and Herqueville). Good simulations of the adsorption of Cs+ and Sr2+ onto Pusignan and Etoile-sur-Rhône are obtained. In the case of Herqueville, the removal of NOM does not improve the agreement between experimental results and simulations, but the removal of exchangeable aluminum allows a better representation of the adsorption results of Sr2+ onto Herqueville, but not for Cs+. This work allows efficiently simulating the adsorption of Cs and Sr onto soils and support decontamination and remediation strategies after a nuclear accident
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Submitted on : Friday, March 29, 2019 - 12:28:07 PM
Last modification on : Tuesday, September 1, 2020 - 3:07:26 AM
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  • HAL Id : tel-02083966, version 1



Brice Siroux. Interactions dans un système césium, strontium/matière organique naturelle/argiles des sols. Géochimie. Université Sorbonne Paris Cité, 2017. Français. ⟨NNT : 2017USPCC177⟩. ⟨tel-02083966⟩



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