Evaluation of differential pulse voltammetry at carbon electrodes.
The background and analytical responses of differential pulse voltammetry at carbon electrodes have been evaluated. Transient currents associated with small potential steps have been examined and are attributed mainly to redox reactions of various groups on the electrode surface. Instrumental parameters have been thoroughly investigated and optimized for improving the signal-to-background response. Glassy-carbon and carbon-paste disk electrodes have been compared, and the latter found to yield better response owing to the lower background current. Dopamine, epinephrine, chlorpromazine, ascorbic acid, homovanillic acid and ferrocyanide were used as test systems.
Wang
J
J
Department of Chemistry, New Mexico State University, Las Cruces, NM 88003, U.S.A.
Freiha
B A
BA