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- W1986078190 abstract "The oxidation kinetics of Cr(III) to Cr(VI) on the surface of manganite (γ-MnOOH) have been investigated as a function of Cr(III) and manganite concentration, pH, ionic strength, and temperature. The reaction is first order with respect to the manganite adsorption density and also to Cr(III) concentration up to a critical adsorption density (0.2 μmol m−2). Above this concentration the reaction appears to be inhibited. The reaction is independent of pH and ionic strength. The rate law can be written as d[Cr(VI)]dt = k · ([Cr(III)0] − [Cr(VI)]) · {γ-MnOOH} where k is 1.08 × 10−2 ± 0.03 × 10−2 L m−2 s−1 and [Cr(III)0], [Cr(VI)], and {γ-MnOOH} are the concentrations of initial Cr(III), Cr(VI), and manganite in molL and m2L, respectively. Approximately three Mn(II) ions are released for every Cr(III) ion which is oxidised. In the presence of organic ligands the reaction proceeds more slowly." @default.
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- W1986078190 date "1991-10-01" @default.
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- W1986078190 title "The oxidation of chromium(III) to chromium(VI) on the surface of manganite (γ-MnOOH)" @default.
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- W1986078190 doi "https://doi.org/10.1016/0016-7037(91)90451-a" @default.
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