%0 Journal Article
%T Electrooxidation and Determination of Dopamine Using a Nafion£¿-Cobalt Hexacyanoferrate Film Modified Electrode
%A Suely S. L. Castro
%A Roger J. Mortimer
%A Marcelo F. De Oliveira
%A Nelson R. Stradiotto
%J Sensors
%D 2008
%I MDPI AG
%R 10.3390/s8031950
%X 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 ¡Á 105 cm3 mol-1 s-1 at a concentration of 5.0 ¡Á 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 ¡Á 10-5 to 5.0 ¡Á 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 ¡Á 10-6 mol L-1 and the relative standard deviation for five measurements of 2.5 ¡Á 10-4 mol L-1 dopamine was 0.58%.
%K Cobalt hexacyanoferrate
%K chemically modified electrode
%K dopamine
%K voltammetry
%K rotating disk electrode.
%U http://www.mdpi.com/1424-8220/8/3/1950