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以亚戊基双（４＇－苯并１５－冠－５）为中性载体，制得对Ｋ￣＋、具有相近响应的ＰＶＣ膜离子选择性电极。Ｎｅｒｎｓｔ线性响应范围１×１０￣（－１）～８×１０￣（－５）ｍｏｌ／Ｌ；响应斜率为５３ｍＶ／ＰＭ；对Ｌｉ￣＋、Ｎａ￣＋、Ｃａ￣（２＋）、Ｍｇ￣（２＋）、Ｂａ￣（２＋）的选择性系数分别为６×１０￣（－５），５×１０￣（－３），３×１０￣（－４），４×１０￣（－４），８×１０￣（－４）。用本电极可快速测出土壤肥料中速效氮、钾的含量。
With pentylene bis (4’-benzo-15-crown-5) as a neutral carrier, to K ~ +, has similar response PVC membrane ion selective electrode. The linear response range of Nernst is 1 × 10 ~ (-1) ~ 8 × 10 ~ (-5) mol / L, the response slope is 53mV / PM, and the response of Li ~ +, Na ~ +, Ca ~ (2 +), Mg ~ The selectivity coefficients of Ba 2+ were 6 × 10 -5, 5 × 10 -3, 3 × 10 -4, 4 × 10 -4, 8 × 10 ~ (-4). This electrode can be quickly measured soil available fertilizer nitrogen, potassium content.