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Etude de l'effet de facteurs environnementaux sur les processus biogéochimiques de mobilisation du Pb, Zn, Cd, As et Hg dans les sols : modélisation empirique de la mobilité et phytodisponibilité des ETM

Abstract : Pollution induced by trace elements in soils is a major environmental problem because, compared to atmospheric and water pollution, the soil environment is much less resilient. Few studies have been conducted on the effect of environmental factors on trace elements mobility. The different empirical models expressing trace elements solubility and distribution coefficient in soils don?t take into account the effect of these factors. The thesis study the effect of global-change-sensitive factors on Cd, Pb, Zn, As and Hg mobility in soils, using a 24-1 fractional factorial design. Eleven soil samples representative of the 3 industrial and agricultural studied sites of the Meuse and Ebro basins have been studied in the framework of the European AQUATERRA project. As behaviour is not significatively linked to intrinsic nature of soil samples but to the temperature increase and to an anaerobic condition. These factors stimulate microbial activities involved in As solubilisation processes such as microbial dissolutive reduction of Fe oxyhydroxydes and As(V) reduction. The strong influence of microbial activity allow to model As mobility as a function of environmental factors for the whole 11 soil samples. On the contrary, Cd, Pb and above all Zn behaviour, are correlated very significatively to the nature of soil samples like soil pH. Finally, Cd, Pb, Zn and As phytoavailability have been assessed thanks to a compartment system and modelled empirically which aims to better estimate of soil-plant transfer processes.
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Antoine Joubert. Etude de l'effet de facteurs environnementaux sur les processus biogéochimiques de mobilisation du Pb, Zn, Cd, As et Hg dans les sols : modélisation empirique de la mobilité et phytodisponibilité des ETM. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2008. Français. ⟨NNT : 2008NAN10019⟩. ⟨tel-01748369⟩

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