Reduction of hexavalent chromium at solid electrodes in acidic media: reaction mechanism and analytical applications |
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Authors: | Welch Christine M Nekrassova Olga Compton Richard G |
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Institution: | Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK |
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Abstract: | The electrochemical detection of hexavalent chromium species was investigated. It was found that Cr(VI) can undergo chemically irreversible reduction in acidic solutions at gold, glassy carbon and boron-doped diamond electrodes. The process was found to be diffusionally controlled at all three electrodes studied. The response obtained at a gold electrode towards the reduction of chromium(VI) produced an electrochemically reversible wave in contrast to those recorded at glassy carbon and boron-doped diamond electrodes. The analytical response of the hexavalent species was studied at gold electrodes in the presence of common environmental interferences: Ni2+, Cu2+, Fe3+, Cr3+ and Triton X-100 (surfactant), with an LoD of 4.3 μM obtained in the presence of 5 mM Cr(III). |
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Keywords: | Chromium Boron-doped diamond electrode Gold electrode Environmental samples |
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