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 p oly(pyrrole) contact and neutral carrier tri-n-dodecylamine membrane w as developed. The effect of the poly(pyrrole) doping anion on the char acteristic of the sensor is presented and discussed. The ion-selective H+ sensitive electrode with a solid poly(pyrrole) contact is characte rized by having a good stability over both short and long periods of t ime. Selectivity coefficients for this electrode are slightly better t han those for internal solution electrodes. Stability is also improved especially when compared with coated rr;ire type electrodes. Response s are fast and nearly Nernstian within the pH range 2-12. All solid-st ate sensors with plastic tri-n-dodecylamine were used for pH determina tions in blood serum.