Polarographic studies of catalytic reduction of hydrogen in Cr(VI)?As(III) and Cr(III)—As(III) systems |
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Authors: | Mieczyslaw Korolczuk Jerzy Matysik |
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Institution: | Institute of Chemistry and Central Laboratory, Maria Curie-Sklodowska University, Lublin, Poland |
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Abstract: | In the presence of traces of Cr(VI) or Cr(III) ions in ammonia or borate buffers containing the As(III) ions a catalytic hydrogen wave arises in the dc polarogram. It was established that the complex Cr(H2AsO3)n+3?n is formed in the solution, and that its reduced form adsorbed at DME is of catalytic activity. The wave can be employed for the determination of low concentrations (2×10?8×10?7M) of Cr(VI) and Cr(III) ions. |
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