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Updated: Jul 19, 2026

Deployment and Retrieval of Mineral Samplers
Published on: January 20, 2026
Chromium and nickel mobilization from a contaminated soil using chelants
Liliane Jean1, François Bordas, Jean-Claude Bollinger
1Laboratoire des Sciences de l'Eau et de l'Environnement, Université de Limoges, 123 avenue Albert Thomas, Limoges, France.
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 modeling 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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