Analytical Applications of Modified Lead Dioxide Electrodes.

概要

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Electrochemical activity and stability of pure lead dioxide(PbO2) and lead dioxide incorporated with metal ions (As5+, Bi3+, Cr3+, Fe3+ and Ni2+) were studied. Heterogeneous rate constants for oxidation of numerous inorganic and organic compounds at PbO2 were compared with those at mixed lead dioxide electrodes. Among the tested metal ions, it turns out that arsenic is one of the promising elements. The electrochemical stability of the mixed oxide electrode prepared in an optimum condition, i.e., As5+/Pb2+ in the deposition solution, was increased compared to that of PbO2. For the application of the electrode material to electroanalysis, detection of thiourea, for example, at PbO2, and As incorporated lead dioxide electrodes(As/PbO2) as working electrodes in a thin layer electrochemical cell for flow injection analysis(FIA) was investigated by a constant-potential amperometry. Sensitive detection of thiourea with a detection limit of 1.4x10-7M was achieved with PbO2 and As/PbO2 electrodes.
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