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Can chromite weathering be a source of Cr in soils?

Published online by Cambridge University Press:  05 July 2018

J. Garnier ,
C. Quantin ,
E. Guimarães  and
T. Becquer
J. Garnier
Affiliation:
UMR 8148 IDES, UPS11-CNRS, Bât. 504, 91405 Orsay Cedex, France UNB, IG/GMP-ICC Centro, Campus Universitario Darcy Ribeiro, 70919-970, Brasilia-DF, Brazil
C. Quantin
Affiliation:
UMR 8148 IDES, UPS11-CNRS, Bât. 504, 91405 Orsay Cedex, France IRD UMR LISAH, Sup Agro, Bât.12, 34060 Montpellier Cedex 2, France
E. Guimarães
Affiliation:
UNB, IG/GMP-ICC Centro, Campus Universitario Darcy Ribeiro, 70919-970, Brasilia-DF, Brazil
T. Becquer
Affiliation:
IRD, UMR 137 BioSol, Univ. Paris VI and XII, Embrapa Cerrados, CP 7091, 71619-970, Brasilia-DF, Brazil
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Abstract

At Niquelândia, Cr extracted from the soil (5,000–9,300 mg.kg-1) is likely the result of the Cr-bearing Fe-oxides compared to the Cr-spinels, showing that low Cr-containing minerals present in the dunite (enstatite, olivine and clay minerals) have been completely dissolved. The chromites, accumulated inside soil profiles, have undergone chemical weathering, leading to a Cr enrichment during soil genesis. Traces of dissolution inside the soil chromites suggest that they can be slowly weathered. In this case chromites could represent a diffuse source of available Cr(III) within the soil profiles.

Type
Research Article
Information
Mineralogical Magazine , Volume 72 , Issue 1 , February 2008 , pp. 49 - 53
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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