Distribution, transformation and bioavailability of trivalent and hexavalent chromium in contaminated soil |
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| Authors: | Fengxiang X. Han Yi Su B. B. Maruthi Sridhar David L. Monts |
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| Affiliation: | (1) Diagnostic Instrumentation and Analysis Laboratory (DIAL), Mississippi State University, 205 Research Blvd., 39759 Starkville, MS, USA;(2) Department of Plant and Soil Sciences, Mississippi State University, MS 39762, Mississippi State, USA;(3) Department of Physics and Astronomy, Mississippi State University, MS 39762, Mississippi State, USA |
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| Abstract: | The purpose of this study was to investigate solid-phase distribution, transformation, and bioavailability of Cr in Cr(III) and Cr(VI) contaminated soils. The effects of EDTA treatment on solid-phase distribution of Cr in soils were also examined. The results show that Cr in both initially Cr(III)- and Cr(VI)-contaminated soils was mainly present in the organic matter bound fraction. Chromium had similar solid-phase distribution and similar overall binding intensity in both Cr(III)- and Cr(VI)-contaminated soils after a growing season. Transformation between Cr(III) and Cr(VI) took place in both Cr(III)- and Cr(VI)-treated soils. Chromium in the Cr(III)-contaminated soils was mostly present as Cr(III), while Cr in Cr(VI)-treated soils was mainly transformed into Cr(III). About 2% of Cr in native non-treated soils was found as Cr(VI). EDTA treatment increased Cr in soluble and exchangeable fraction in Cr(III)-treated soils. In both Cr(III)- and Cr(VI)-contaminated soils, Cr in oxide bound and organic matter bound |
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| Keywords: | chromium distribution transformation bioavailability contaminated soil fractions was bioavailable to Indian mustard |
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