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Title: Electrooxidation and determination of dopamine using a Nafion®-cobalt hexacyanoferrate film modified electrode
Authors: Castro, Suely S.L.
Mortimer, Roger J.
de Oliveira, Marcelo F
Stradiotto, Nelson R.
Keywords: Cobalt hexacyanoferrate
Chemically modified electrode
Dopamine
Voltammetry
Rotating disk electrode
Issue Date: 2008
Publisher: © MDPI
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
Abstract: 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%.
Description: This article was published in the journal, Sensors [© MDPI] and the definitive version is available at: www.mdpi.org/sensors
Version: Published
DOI: 10.3390/s8031950
URI: https://dspace.lboro.ac.uk/2134/5083
ISSN: 1424-8220
Appears in Collections:Published Articles (Chemistry)

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