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Potential transformations of chromium in natural waters

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A study has been conducted on the transformation of Cr(III) and Cr(VI) in simulated natural water conditions. It has been found that these forms are readily interconvertible under natural water conditions. The results of this study indicate that Cr(VI) is reduced by Fe(II), dissolved sulfides, and certain organic compounds with sulfhydryl groups, while Cr(III) is oxidized by a large excess of MnO2 and at a slow rate by Oz under conditions approximating those in natural waters. Based on the results of these studies, water quality standards for Cr should be based on total Cr rather than on Cr(VI), as has been frequently done in the past.

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Schroeder, D.C., Lee, G.F. Potential transformations of chromium in natural waters. Water Air Soil Pollut 4, 355–365 (1975). https://doi.org/10.1007/BF00280721

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  • Sulfide
  • Chromium
  • Water Quality
  • Organic Compound
  • MnO2