Hexavalent chromium is a known carcinogen. The EPA has a drinking water standard of 0.1 milligrams per liter (mg/l) or 100 parts per billion (ppb) for total chromium. Interestingly, chromium(III) is part of glucose tolerance factor (GTF) and Cr(III)-picolinate is a dietary supplement. The source of chromium(VI) drinking water is mainly from industrial use (chrome plating and leather tanning), and due to the complex geochemistry involving rocks containing chromite and solid manganese dioxide (MnO2. nH2O; Birnessite, a common manganese mineral). The express purpose of our study is to screen several renewable organic substrates that could potentially reduce hexavalent chromium to Cr(III) individually or in co-oxidation reactions with ethanol. This list includes oxalic, lactic, citric, malic, tartaric, gallic and tannic acids. We will report half-lives (t1/2) of first-order reactions under pseudo first-order conditions and discuss the transition state for the ter-molecular complex involving Cr(VI), ethanol and oxalic acid.

Co-oxidation model for the reductive detoxification of hexavalent chromium in ground water: Kinetic screening of renewable substrates for reduction of hexavalent chromium in co-oxidation reactions of ethanol

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