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The catalysis of manganese(II) (Mn 2+ ) on chromium(VI) (Cr 6+ ) reduction by citrate was studied through batch experiments with the concentration of citrate greatly in excess of Cr 6+ at 25°C and in pH ranges of 4.0 to 5.0. Results showed that at pH 4.5 within 22 h direct reduction of Cr 6+ by citrate was not observed, but for the same time when Mn 2+ (50 to...
The kinetics of Cr(VI) reduction by sulfide in soil suspensions with various pHs, soil compositions, and Fe(II) concentrations was examined using batch anaerobic experimental systems at constant temperature. The results showed that the reaction rate of Cr(VI) reduction was in the order of red soil < yellow-brown soil < chernozem and was proportional to the concentration of HCl-extractable iron...
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