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Influence of reducing conditions on metallic elements released from various contaminated soil samples

Abstract : he redox conditions of soil may have significant consequences for the mobility of metallic elements (ME), but unlike pH, very few studies have investigated this parameter. A procedure was established to study the solubilization of ME from soil samples in various reducing conditions using a batch method and sodium ascorbate solutions. The change in redox potential from +410 to +10 mV was studied from four contaminated soil samples (designated A−D) of different origins and compositions. The results showed that ME mobilization greatly increased with decreasing redox potential within a limited and very sensitive range. Depending on the soil sample studied, various sensitive ranges of potentials were obtained (A, 220−345 mV; B, 280−365 mV; C, 260−360 mV; and D, 240−380 mV), and the induced percentages of ME mobilization varied (i.e., maximal values for Zn: A, 45%; B, 59%; C, 53%; and D, 58%). The results could be explained by the combined effect of potential and pH decrease on ME-carrying phases; in particular, Fe and Mn (oxy)hydroxides.
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https://hal-unilim.archives-ouvertes.fr/hal-00652755
Contributeur : Françoise Merigaud <>
Soumis le : vendredi 16 décembre 2011 - 11:00:38
Dernière modification le : lundi 24 septembre 2018 - 09:42:24

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Priscilla Pareuil, Sonia Pénilla, N. Özkan, François Bordas, Jean-Claude Bollinger. Influence of reducing conditions on metallic elements released from various contaminated soil samples. Journal of industrial microbiology, Springer-Verlag, 2008, 42 (20), pp.7615-7621. ⟨10.1021/es800953d⟩. ⟨hal-00652755⟩

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