Journal
JOURNAL OF ANALYTICAL CHEMISTRY
Volume 64, Issue 1, Pages 36-43Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S1061934809010080
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Funding
- Russian Foundation for Basic Research [08-03-00749]
- Russian Federation Ministry of Education and Science [REC-007]
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The catalytic activities of gold, palladium, and rhodium particles and their binary systems electrodeposited on the surface of a glassy-carbon electrode in the oxidation of dopamine and ascorbic acid are compared. As compared to individual noble metals, the Au-Pd binary system exhibits a higher catalytic activity that manifests itself in a multiple increase in the oxidation current of the mediator and in a decrease in the oxidation potential of the substrate. It is found that dopamine and ascorbic acid can be simultaneously determined by voltammetry at an electrode modified with the Au-Pd binary system. The catalytic currents of substrate oxidation are linear functions of the concentrations in the ranges from (1 x 10(-3) to 1 x 10(-7)) M for dopamine and from (5 x 10(-3) to 1 x 10(-6)) M for ascorbic acid.
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