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| - XANES Spectroscopy Studies ofCr(VI) Reduction by Thiols inOrganosulfur Compounds and HumicSubstances
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| - The reduction of Cr(VI) by the thiol-containing compoundscysteine and glutathione and by reduced sulfur in humicsubstances was monitored with sulfur and chromium X-rayabsorption near-edge structure (XANES) spectroscopy inchromium-contaminated soils. Reaction of humic acids withCr(VI) resulted in a reduction of the peak area of thiolsand an increase in the peak area of disulfides in the sulfurXANES spectra. Analysis of the sulfur XANES spectra invarious systems indicates that the reduction of Cr(VI) byhumic substances involves a thiol/disulfide redox coupleanalogous to that of the Cr(VI) reduction by the simple thiol-containing compounds cysteine and glutathione. Afraction of the hexavalent chromium present in industrially-contaminated soils was not reducible by thiols. Reductionof Cr(VI) to Cr(III) in soils by thiols has little effect onthe pH of the system in contrast to the pH decrease resultingfrom reduction by Fe(II).
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