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- Electrooxidation and determination of dopamine using a Nafion (R)-cobalt hexacyanoferrate film modified electrode
- Universidade Estadual Paulista (UNESP)
- Universidade do Estado do Rio Grande do Norte (UERN)
- Univ Loughborough
- Universidade de São Paulo (USP)
- 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 x 105 cm(3) mol(-1) s(-1) at a concentration of 5.0 x 10(-5) mol L-1. When a Nafion (R) 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 x 10(-5) to 5.0 x 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 x 10(-6) mol L-1 and the relative standard deviation for five measurements of 2.5 x 10(-4) mol L-1 dopamine was 0.58%.
- Sensors. Basel: Molecular Diversity Preservation Int, v. 8, n. 3, p. 1950-1959, 2008.
- Molecular Diversity Preservation Int
- cobalt hexacyanoferrate
- chemically modified electrode
- rotating disk electrode
- Acesso aberto
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