ALL-SOLID-STATE HYDROGEN ION-SELECTIVE ELECTRODE BASED ON A CONDUCTING POLY(PYRROLE) SOLID CONTACT

A potentiometric ion-selective electrode based on a solid conducting poly(pyrrole) contact and neutral carrier tri-n-dodecylamine membrane was developed. The effect of the poly(pyrrole) doping anion on the characteristic of the sensor is presented and discussed. The ion-selective H+ sensitive electrode with a solid poly(pyrrole) contact is characterized by having a good stability over both short and long periods of time. Selectivity coefficients for this electrode are slightly better than those for internal solution electrodes. Stability is also improved especially when compared with coated rr;ire type electrodes. Responses are fast and nearly Nernstian within the pH range 2-12. All solid-state sensors with plastic tri-n-dodecylamine were used for pH determinations in blood serum.