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The electrocatalysis of dopamine has been studied using a cobalt hexacyanoferrate film (CoHCFe)-modified glassy carbon electrode. Using a rotating disk CoHCFe-modified electrode, the reaction rate constant for dopamine was found to be 3.5 × 105 cm³ mol -1 s -1 at a concentration of 5.0 × 10 -5 mol L -1 . When a Nafion ® film is applied to the CoHCFe-modified electrode surface a high selectivity for the determination of dopamine over ascorbic acid was obtained. The analytical curve for dopamine presented linear dependence over the concentration range from 1.2 × 10 -5 to 5.0 × 10 -4 mol L -1 with a slope of 23.5 mA mol -1 L and a linear correlation coefficient of 0.999. The detection limit of this method was 8.9 × 10-6 mol L -1 and the relative standard deviation for five measurements of 2.5 × 10-4 mol L -1 dopamine was 0.58%.

Electrooxidation and Determination of Dopamine Using a Nafion®-Cobalt Hexacyanoferrate Film Modified Electrode