期刊
ANALYTICA CHIMICA ACTA
卷 596, 期 1, 页码 92-98出版社
ELSEVIER
DOI: 10.1016/j.aca.2007.05.064
关键词
poly(3,4-ethylenedioxythiophene-co-(5-amino-2-naphthalenesulfonic acid)); linear sweep voltammetry; dopamine; ascorbic acid; uric acid
Poly(3,4-ethylenedioxythiophene-co-(5-amino-2-naphthalenesulfonic acid)) (PEDOT-PANS) film modified glassy carbon electrode was prepared by electrochemical polymerization technique. The properties of modified electrode was studied. It was found that the electrochemical properties of modified electrode was very much dependent on the experimental conditions, such as monomer oxidation potential and pH. The modified electrode surface was characterized by scanning electron microscopy (SEM). The PEDOT PANS film modified electrode shows electrocatalytic activity toward oxidation of dopamine (DA) in acetate buffer solution (pH 5.0) and results in a marked enhancement of the current response. The linear sweep voltammetric (LSV) peak heights are linear with DA concentration from 2 x 10(-6) to 1 x 10(-5) M. The detection limit is 5 x 10(-7) M. More over, the interferences of ascorbic acid (AA) and uric acid (UA) were effectively diminished. This work provides a simple and easy approach for selective determination of dopamine in the presence of ascorbic acid and uric acid. (c) 2007 Elsevier B.V. All rights reserved.
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