Construction And Characteristics of Epoxy Polymer Membrane Electrode for Chloride

Some different types of miniaturized polymer membrane electrodes (PMEs) for chloride ion were constructed by the use of epoxy matrix membrane. The PME of the best characteristics consists of a copper wire and three coating layers of silver paste of epoxy matrix type, silver chloride and epoxy matrix incorporating about 45 wt % of an ion exchanger solution. The most suitable ion exchanger solution was 1-decanol containing 0.4 wt % of trioctylmethylammonium chloride. The thickness of coating layers were (0.2~0.3) mm at each layer and the electrode was about 1 mm outer diameter. The responses of the PME were Nernstian for (5X10-5~4X 10-2) M chloride. The noise of the PME on electrode potential was ± 0.5 mV at the lower linear response range. The selectivity coefficients (K Yr) of the PME for perchlorate and iodide were 1.3 and 1.1, respectively.