用四苯硼钠溶液电导滴定法确定终点，测定钾的含量。适宜测定的ｐＨ＞９，在此范围内氨的存在不干扰测定。测定高含量钾和中含量钾回收率分别在９９．８％～１００．２％和９９．２％～１００．８％。该法简便，测定周期仅需１０ｍｉｎ左右，所需试剂种类和用量少，准确度与四苯硼钾重量法接近，适用于钾盐、卤水和复混肥和钾肥中钾的测定 Conductivity titration with sodium tetraphenylborate endpoint determination of potassium content. Suitably, pH> 9, within the range of ammonia presence does not interfere with the assay. The recovery of high potassium and medium potassium was 99.8% ~ 100.2% and 99.2% ~ 100.8%, respectively. The method is simple, the determination period is only about 10min, the type and amount of reagents required is small, the accuracy is close to that of potassium tetraphenylborate, which is suitable for the determination of potassium in potash, brine, compound fertilizer and potash