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 s at a concentration of 5.0 × 10 mol L. 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 to 5.0 × 10 mol L with a slope of 23.5 mA mol L and a linear correlation coefficient of 0.999. The detection limit of this method was 8.9 × 10-6 mol L and the relative standard deviation for five measurements of 2.5 × 10-4 mol L dopamine was 0.58%.
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| http://dx.doi.org/10.3390/s8031950 | DOI Listing |
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