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Electrooxidation and determination of dopamine using a Nafion®-cobalt hexacyanoferrate film modified electrode

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posted on 2009-08-03, 15:44 authored by Suely S.L. Castro, Roger J. Mortimer, Marcelo F de Oliveira, Nelson R. Stradiotto
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%.

History

School

  • Science

Department

  • Chemistry

Citation

CASTRO, S.S.L. ... et al, 2008. Electrooxidation and determination of dopamine using a Nafion®-cobalt hexacyanoferrate film modified electrode. Sensors, 8, pp. 1950-1959

Publisher

© MDPI

Version

  • VoR (Version of Record)

Publication date

2008

Notes

This article was published in the journal, Sensors [© MDPI] and the definitive version is available at: www.mdpi.org/sensors

ISSN

1424-8220

Language

  • en