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- W2079355105 abstract "The Cr(VI)/Cr(III) reduction reaction has been studied at a gold rotating disk electrode in add medium containing chloride ions. In the absence of chloride ions, no reduction was observed, suggesting that insoluble Cr(III) products are present at the electrode, blocking its surface. For [CP−]/[CrO3] < 1 the reduction reaction corresponds to a CE mechanism where the chloride ions play an important role in the process. For [Cl−]/[CrO3] > 1, the chemical step is sufficiently rapid and the reaction corresponds to a multistep charge transfer mechanism. The Levich equation for diffusion control is obeyed for [Cl−]/[CrO3] ranging from 103 to 1, independently of changes in the ionic force, viscosity and pH of the solutions. A value of 1.20 × 10−5 cm2 s−1 for the mean diffusion coefficient of Cr(VI) was obtained in 0.23 M HCl medium." @default.
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- W2079355105 date "1990-05-01" @default.
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- W2079355105 title "The effect of chloride ions on the electrochemical reduction of Cr(VI) to Cr(III) at a rotating disk electrode" @default.
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- W2079355105 doi "https://doi.org/10.1016/0022-0728(90)87070-z" @default.
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