1 research outputs found
Electrooxidation and determination of dopamine using a Nafion®-cobalt hexacyanoferrate film modified electrode
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%