Solid speciation and availability of chromium in ultramafic soils from Niquelândia, Brazil |
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Authors: | J Garnier C Quantin ES Martins T Becquer |
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Institution: | aUMR 8148 IDES, UPSXI-CNRS, Bât. 504, 91405 Orsay Cedex, France;bEmbrapa Cerrados, BR 020, km 18, rodovia Brasília/Fortaleza, CP 08223 CEP 73301-970, Planaltina-DF, Brazil;cUMR 137 Biodiversité et Fonctionnement des Sols, IRD/Embrapa Cerrados, CP 7091, 71619-970, Brasilia-DF, Brazil |
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Abstract: | The sources and the potential availability of chromium were investigated in ultramafic soils from Niquelândia (Goïas State, Brazil), with chemical extractions associated to mineralogical studies, in order to evaluate its bioavailability and its potential impact on the soil biodiversity. Cr contents are particularly high in the studied soils and its partitioning among the solid phase varies with the position in the landscape and depth. Most of the Cr is associated to Fe-oxides but the amount of exchangeable Cr(VI) is high, particularly in one soil profile. Cr availability is higher than expected, and Cr-tolerant vegetation is probably growing on these soils. |
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Keywords: | Ultramafic soil Chromium Solid speciation Availability Brazil |
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