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Chromium(III) Oxidation By .delta.-manganese Oxide (MnO2). 1. Characterization

S. Fendorf, R. Zasoski
Published 1992 · Chemistry

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The oxidation of Cr(III) by a common naturally occurring form of manganese oxide, δ-MnO 2 , was characterized over a range of Cr(III) concentrations and pH values. Cr(III) oxidation was limited as pH and Cr(III) concentrations increased. Reaction products, Mn(II) and Cr(VI), did not limit Cr(III) oxidation. Initial Cr(III) oxidation rates were very rapid at pH=5, but were subsequently followed by a dramatic rate decline. Thermodynamic calculations using solution species indicated the reaction should proceed under conditions where the reaction had terminated



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