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Article dans une revue

Chromium and nickel mobilization from a contaminated soil using chelants

Abstract : The mobilization of chromium and nickel from an industrial soil was investigated using two biodegradable chelants (citric acid and histidine), compared with a persistent one (ethylenediaminetetraacetic acid). Successive metal mobilizations were carried out in batch experiments. The main reactions involved were estimated by modelling the system with MINEQL+. For a single mobilization, citric acid was the most effective for Cr mobilization and EDTA for Ni. Their effectiveness could be explained by their ability to solubilize the mineral matrix and by the competition for the surfaces sites to desorb Cr(VI). Before and after the mobilizations, the distribution of metals was determined by a sequential extraction procedure. Only slight modifications were observed due to the low percentage of solubilized metal. A concentration of 0.05 mol.L-1 (citric acid and EDTA) allows a good compromise between metal mobilization and preservation of the soil mineral integrity
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Soumis le : lundi 7 novembre 2011 - 17:26:49
Dernière modification le : vendredi 23 octobre 2020 - 16:44:10
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Liliane Jean, François Bordas, Jean-Claude Bollinger. Chromium and nickel mobilization from a contaminated soil using chelants. Environmental Pollution, Elsevier, 2007, 147 (3), pp.729-736. ⟨hal-00638978⟩

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