All-solid-state ion-selective electrodes with ion-to-electron transducers for dopamine determination

The electrically conducting polymers — polyaniline and originally synthesized poly(N-phenylglycine) — have been used as ion-electron transducers for new all-solid-state ion-selective membrane electrodes (ISEs) intended for the determination of dopamine. The properties of the new ISEs are evaluated, including the slope of the electrode characteristic, the linear range of the potential versus pC response, the effect of pH, and the response time. The results of chronopotentiometric measurements show that the new ISEs possess highly stable characteristics. The selectivity coefficients with respect to some foreign ions are determined. A method for potentiometric determination of dopamine using the new ISEs is developed. __________ Translated from Khimiko-Farmatsevticheskii Zhurnal, Vol. 40, No. 6, pp. 44–46, June, 2006.