Simultaneous voltammetric determination of dopamine and ascorbic acid at an electrode modified with the gold-palladium binary system |
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Authors: | L G Shaidarova I A Chelnokova A V Gedmina G K Budnikov |
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Institution: | (1) Butlerov Institute of Chemistry, Kazan State University, ul. Kremlevskaya 18, Kazan, 420008, Tatarstan, Russia |
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Abstract: | 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 × 10?3 to 1 × 10?7) M for dopamine and from (5 × 10?3 to 1 × 10?6) M for ascorbic acid. |
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