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Etude théorique et expérimentale du comportement biogéochimique de l'Américium-241 en conditions rhizosphériques simplifiées : application dans un sol agricole calcaire

Abstract : Our research investigated the relevant biogeochemical processes controlling 241Am migration in the rhizosphere of agricultural soils. Lixiviation tests were performed on columns packed with calcareous soil artificially contaminated with Am, with various solutions containing citrate and/or glucose to simulate root exudates. Results show contrasted Am releases : minute for a solution in equilibrium with the soil or containing 10-4 M concentrations in exudates, small for important glucose supply, they were 300 to 10000 greater with citrate at >10-2 M with or without glucose, by complexing Am released in solution after the dissolution of carrier phases. Significant Am colloidal transport was also systematically observed. The complexity and inter-connectivity of the processes are pointed out and modelling directions are discussed on the basis of a specific thermodynamical database.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2004_0058_PERRIER.pdf
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https://hal.univ-lorraine.fr/tel-01746778
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Submitted on : Thursday, March 29, 2018 - 10:44:41 AM
Last modification on : Monday, August 31, 2020 - 10:33:03 AM

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  • HAL Id : tel-01746778, version 1

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Thomas Perrier. Etude théorique et expérimentale du comportement biogéochimique de l'Américium-241 en conditions rhizosphériques simplifiées : application dans un sol agricole calcaire. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2004. Français. ⟨NNT : 2004NAN10058⟩. ⟨tel-01746778⟩

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