Abstract
A ‘self-doped’ polyaniline modified microelectrode, prepared by cyclic potential sweep on a microdisk gold electrode from –0.2 to 0.85 V in 0.5 mol/L sulfuric acid containing aniline and o-aminobenzoic acid, has been developed. The copolymerized process and the resulting polymer characteristics were investigated in detail. This composite film indicated a good electrochemical activity in a wide pH range even in basic solution. Meanwhile, the redox couple exhibited an excellent electrocatalytic activity for the oxidation of ascorbic acid. The oxidation overpotential of ascorbic acid was decreased over 200 mV at this modified electrode compared with a bare gold one. Moreover, the effects of film thickness and pH on the catalytic efficiency were further studied. The dependence of catalytic currents on the concentration of ascorbic acid was linear in the range of 1.2 × 10–5∼ 2.4 × 10–3 mol/L with a correlation coefficient of 0.996. Also, the determination of ascorbic acid in actual samples was evaluated and the results are satisfactory.
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Received: 7 October 1997 / Revised: 3 February 1998 / Accepted: 7 February 1998
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Xu, JJ., Zhou, DM. & Chen, HY. Amperometric determination of ascorbic acid at a novel ‘self-doped’ polyaniline modified microelectrode. Fresenius J Anal Chem 362, 234–238 (1998). https://doi.org/10.1007/s002160051066
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DOI: https://doi.org/10.1007/s002160051066