STUDY OF THE TEMPERATURE BEHAVIOR OF ALL-SOLID-STATE NONACTIN AMMONIUM ELECTRODES WITH PVC MEMBRANE APPLIED TO GRAPHITE-EPOXY SUPPORTS OF VARIED COMPOSITION

A study of the effect of the temperature on the response of all-solid- state ammonium selective electrodes prepared by casting PVC membranes with nonactin on supports of graphite-epoxy composites containing a va riable amount of graphite up to 60% is presented. It is shown that whi le supports made of composites with 30% or less of graphite provide no adequate response characteristics, the variation of the percentage of graphite between 40 and 60% has no influence neither on the slope and standard potential temperature coefficients of the electrodes, nor on their isopotential point concentrations. The temperature hysteresis o f the electrodes was found to be limited and also independent of the a mount of graphite in the composite. (C) 1997 Elsevier Science B.V.