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一、前言钾离子选择电极的发展经历了玻璃膜电极,液膜电极而到高聚物膜电极。钾玻璃电极的选择性不高(K_(Na,k)<20);液膜电极寿命不长,2-3周即需更新;高聚物膜钾电极制作简便,如选用合适的活性物质和基材,则性能优越,寿命甚长,近年来已受到人们的重视。目前最好的钾电极是以缬氨霉素为活性材料的高聚物膜电极,K_(Na,k)～5000,寿命可达数年。不过缬氨霉素合成不易,价格甚高。
I. Introduction The development of potassium ion selective electrode has undergone glass membrane electrode, liquid membrane electrode and high polymer membrane electrode. The selectivity of potassium glass electrode is not high (K_ (Na, k) <20); the life of the liquid film electrode is not long and needs to be updated in 2-3 weeks; the potassium electrode of the high polymer film is easy to manufacture by adopting suitable active materials and Substrate, the superior performance, long life expectancy, in recent years has been people’s attention. At present, the best potassium electrode is a polyelectrolyte membrane electrode with valinomycin as the active material, K_ (Na, k) ~ 5000, and the life span can reach several years. However, valinomycin synthesis is not easy, the price is very high.