Derivative hydrodynamic-modulation voltammetry.
A technique based on derivative hydrodynamic-modulation voltammetry has been developed for improving the resolution in sensitive analyses of mixtures, at solid electrodes. By simple treatment of the hydrodynamic-modulation data the voltammetric current-potential waves can be transformed into peak-shaped curves, which are frequently more convenient for further data processing. To obtain such curves the rate of change in hydrodynamic-modulation current with potential is plotted against potential. Single and multiple peak systems are evaluated at the micromolar concentration level, by use of stopped-rotation and stopped-flow voltammetry. Dopamine, ascorbic acid, NADH, homovanillic acid and chlorpromazine were used as test compounds. The method is simple and suitable for on-line computerization.
Wang
J
J
Department of Chemistry, New Mexico State University, Las Cruces, NM 88003, U.S.A.