Abstract
High temperature pressure Ag/AgCl electrodes resistant to the contaminating effects of H/sub 2/ and H/sub 2/S were described in 1979. But the external reference electrode suffers from a thermal liquid junction potential (TLJP) and the development of the Soret effect (thermo-diffusion of the electrolyte). This paper describes a design to improve electrode life. A silvered-tube replaces the silver wire electrode. A liquid chromatograph minipump is used to slowly inject KC1 solution into the electrode to maintain a ''front'' of fresh solution. This prevents ageing effects, and the Soret effect. Construction specifications are given for: corrosion resistant tubing, electrical gland end, zirconium yarn, titanium tubing, polyimide collar, PTFE tubing, minipumps for chromatograph, zirconia plug, and silver chloride.
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