J. Phys. IV France 107 (2003) 735
Biogeochemical cycle and speciation of As and Cr in an acid mine environment : The case of Carnoulès Creek, FranceI. Le Hécho1, C. Pecheyran1, S. Charles1, M. Monperrus1, M.-P. Pavageau1, C. Casiot2, M. Potin-Gautier1, M. Leblanc2, 2 and O.F.X. Donard1
1 Laboratoire de Chimie Analytique Brio-inorganique et Environnement, UMR 5034 du CNRS, Hélioparc Pau-Pyrénées, 2 avenue du Président Angot, 64053 Pau cedex 9, France
2 Laboratoire Hydrosciences, UMR 5569, Université de Montpellier 2, Case 57, place E. Bataillon, 34095 Montpellier cedex 05, France
The aim of the work was to understand the biogeochemical cycles of two pollutants of interest found in the Carnoulès Creek : arsenic and chromium. The data for dissolved chromium speciation showed that this element is rather homogeneously distributed along the seepage water with 70-80% of Cr (VI); in particles collected from the same samples. chromium is totally present under the trivalent form. These results are consistent with the fact that hexavalent chromium is much more mobile fhan Cr (III).
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