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Square-Wave Voltammetric Determination of Uric Acid by Catalytic Oxidation at a Perfluorosulfonated Ionomer/Ruthenium Oxide Pyrochlore Chemically Modified Electrode

A Nafion/ruthenium oxide pyrochlore (Pb 2 Ru 2-x Pb x O 7-y ) chemically modified electrode (CME) for the determination of uric acid by Osteryoung square-wave voltammetry (OSWV) is described. Compared to the glassy carbon electrode, the CME exhibits a 150 mV shit of the oxidation potential of uric acid in the cathodic direction and a marked enhancement of the current response. The best instrumental settings for OSWV are 50 Hz modulation frequency, 20 mV modulation amplitude, and 2 mV step height. Linear calibration curves are obtained over the 7.5×10 -5 -5×10 -7 M range in pH 1 buffer solution. The detection limit (3) is 1.1×10 -7 M. Ascorbic acid in less than 10-fold excess does not interfere. The practical analytical utility is illustrated by selective measurements of uric acid in human urine and serum without any preliminary treatmen