Selectivity Testing of Protonic Sense Materials for Development to Microprobe Electrodes

Abstract

Protonic sense materials have been selected from our laboratory for development to
microprobe electrodes. The basic measurement was based on potentiometric method using reference
electrode and indicator electrode. The materials tested were Aluminum-Copper, Platinum-Pencil
lead, Silver/Silver chloride-Pencil lead, Silver/Silver chloride-Copper and Silver-Aluminum.
Measurement of mV count of solution with various pH found that one proton contains 59 mV / pH
range. The selectivity of materials to proton can be seen from the graph plotted between pH and mV
count. The commercial glass electrode was used as comparing electrode and it showed the linear
equation of y = -58.00x +392.1 with r2 = 0.999. The Silver/Silver chloride-Copper probe was found
to be the protonic sense material which provided linear equation of y = -25.07x ??? 73.69 with r2 =
0.931.

Keywords: reference electrode, indicator electrode, protonic sense material, microprobe electrode