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Mineralogical and Physicochemical Methods To Differentiate Between Natural and Anthropogenic Sources of Chromium in Soils
This study evaluates pollution from a former tannery by examining soils containing high concentrations of chromium (between 138 and 720 mg/kg dry matter according to the sample). This study presents an original methodology for characterizing chromium according to its two possible origins in soils: natural or anthropogenic. Conducting both a mineralogical study and a physicochemical study made it possible to clearly understand these origins. Natural chromium is particularly linked to pyroxenes, a primary mineral of the Massif Central, France, and found in large quantities in the samples studied. Anthropogenic chromium is adsorbed by vermiculites on their interfoliary sites. These clays possess a high capacity of cationic exchange and can thus attract chromium easily. In all of the samples studied, the naturally chromiferous mineral contribution was high (97 to 519 mg/kg dry matter), whereas that of the clays was low (41 to 201 mg/kg dry matter), indicating a smaller proportion of chromium introduced by humans. Natural chromium values are approximately 70 to 80%, whereas those for anthropogenic chromium are approximately 20 to 30%. This approach makes it possible to set realistic objectives for the cleanup of chromium‐contaminated soils.
Mineralogical and Physicochemical Methods To Differentiate Between Natural and Anthropogenic Sources of Chromium in Soils
This study evaluates pollution from a former tannery by examining soils containing high concentrations of chromium (between 138 and 720 mg/kg dry matter according to the sample). This study presents an original methodology for characterizing chromium according to its two possible origins in soils: natural or anthropogenic. Conducting both a mineralogical study and a physicochemical study made it possible to clearly understand these origins. Natural chromium is particularly linked to pyroxenes, a primary mineral of the Massif Central, France, and found in large quantities in the samples studied. Anthropogenic chromium is adsorbed by vermiculites on their interfoliary sites. These clays possess a high capacity of cationic exchange and can thus attract chromium easily. In all of the samples studied, the naturally chromiferous mineral contribution was high (97 to 519 mg/kg dry matter), whereas that of the clays was low (41 to 201 mg/kg dry matter), indicating a smaller proportion of chromium introduced by humans. Natural chromium values are approximately 70 to 80%, whereas those for anthropogenic chromium are approximately 20 to 30%. This approach makes it possible to set realistic objectives for the cleanup of chromium‐contaminated soils.
Mineralogical and Physicochemical Methods To Differentiate Between Natural and Anthropogenic Sources of Chromium in Soils
Trupheme, V. (author) / Bousquet, S. (author) / Montrejaud‐Vignoles, M. (author) / Lacout, J.L. (author) / Fortune, J.P. (author) / Poujol, T. (author) / Cafferini, N. (author)
Water Environment Research ; 72 ; 516-522
2000-09-01
7 pages
Article (Journal)
Electronic Resource
English
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