Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10410887 | Sensors and Actuators B: Chemical | 2005 | 7 Pages |
Abstract
A glassy carbon electrode (GCE) is modified with electropolymerized film of p-aminobenzene sulfonic acid (p-ABSA) in pH 7.0 acetate buffer solution (ABS). Cyclic voltammetry (CV), different pulse voltammetry (DPV) and amperometric curve were used to study the electrochemical properties of the polymer film. The polymer film-modified electrode is used to electrochemically detect dopamine (DA) in the presence of ascorbic acid (AA). Polymer film showed excellent electrocatalytic activity for the oxidation of DA and AA. The DA and AA anodic peak potential values at the modified electrode are 196 and â8 mV, respectively, which can be obtained from DPV recordings. In pH 7.0 ABS, the anodic peak current increases linearly over three concentration intervals of DA, viz., 1.0 Ã 10â7-1.0 Ã 10â6, 1.0 Ã 10â6-1.0 Ã 10â5 and 1.0 Ã 10â5-1.0 Ã 10â4 mol lâ1, with the correlation coefficient, 0.9984, 0.9973 and 0.9921, respectively, and the detection limit (S/N = 3) is 2.0 Ã 10â8 mol lâ1. AA has no interference with the determination of DA because of the very distinct attracting interaction between DA cations and the negatively poly(p-ABSA) film. The proposed method exhibits good recovery and reproducibility.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Guiying Jin, Yuzhong Zhang, Wangxing Cheng,