Reactions anodiques et cathodiques des composes de Cr(VI) en milieu de nitrates alcalins fondus |
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Authors: | JP Derivaz J Augustynski |
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Institution: | Laboratoire de Chimie et Electrochimie Appliquées, Université de Genève, Sciences 11, 30, quai ErnestAnsermet, CH1211 Genève 4 (Suisse) |
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Abstract: | The electrochemical behavior of chromate and dichromate, ions in molten NaNO3-KNO3 at 250°C has been studied by single-sweep voltammetry and cyclic voltammetry. The anodic dimerization of CrO42- ions has been shown to proceed in three steps, the reaction: CrO42-→CrO4ad?+e? being rate-determining. The cathodic reduction of Cr2O72- ions includes the coupled acid-base reactions; it forms solid chromium oxide Cr2O3 and the soluble chromate and chromite ions. |
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