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

Author(s): Suely S. L. Castro | Roger J. Mortimer | Marcelo F. de Oliveira | Nelson R. Stradiotto

Journal: Sensors
ISSN 1424-8220

Volume: 8;
Issue: 3;
Start page: 1950;
Date: 2008;
Original page

Keywords: Cobalt hexacyanoferrate | chemically modified electrode | dopamine | voltammetry | rotating disk 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%.

Tango Rapperswil
Tango Rapperswil

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