Journal
ENVIRONMENTAL CHEMISTRY LETTERS
Volume 2, Issue 3, Pages 141-145Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10311-004-0085-4
Keywords
humic substances; chromium; redox; capillary zone electrophoresis; remediation
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The reduction of Cr(VI) by humic substances from leonardite and peat was investigated by capillary zone electrophoresis at various pHs. Both humic materials reduced Cr(VI) at pH 5.4, but not at basic pH. The capacity of leonardite humic substances to reduce Cr(VI) was lower than that of peat humic substances. Fe(III) accelerated the reduction of Cr(VI) by peat humic substances, but not by leonardite humic substances. Cr(VI) reduction mechanisms are proposed. The coal humic substances seem more suitable for remediation of Cr(VI)contaminated sites.
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