期刊
ELECTROCHIMICA ACTA
卷 56, 期 6, 页码 2730-2734出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.12.053
关键词
Ionic liquids; Molecular sieve; Square wave voltammetry; Dopamine; Selective detection
资金
- National Outstanding Youth Foundations of China
- National Science Foundation of China [50725825]
- Special Research Found for the Doctoral Program of Higher Education of China [20060532006]
A simple, sensitive, and reliable method based on a molecular sieve/ionic liquids composite electrode has been successfully developed for selective determination of dopamine (DA). The electrochemical behavior of dopamine (DA) at the modified electrode was investigated by cyclic voltammetry (CV) and square wave voltammetry (SWV). The influence of experimental parameters including pH of solution, amount of modifier, accumulation potential and time on the response of DA was investigated. At the optimum conditions, the peak current of DA was linear with the concentration of DA in the wide range of 5.0 x 10(-8) mol L(-1) to 8 x 10(-4) mol L(-1), with the correlation coefficient of 0.9982. The detection limit was 1.0 x 10(-8) mol L(-1) (S/N=3) in the presence of 0.2 mM ascorbic acid (AA). The interference studies showed that the modified electrode had excellent selectivity. What's more, the modified electrode also exhibited good reproducibility and stability for determination of DA, and could be applied to determine human serum samples. (C) 2010 Elsevier Ltd. All rights reserved.
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