本文应用缬氨霉素钾电极、BF_4~-电极及四苯硼根电极作为指示电极,以四苯硼钠直接电位滴定钾,均获得满意结果.终点突跃较明显,pH 适用范围广,用于硅酸盐试样分析具有方法简单、准确度较好等优点.另外用电极测定了四苯硼钾的溶度积,20℃时为2.25×10~(-8),与文献值十分一致. In this paper, valinomycin potassium electrode, BF_4 ~ - electrode and tetraphenyl boron electrode as the indicator electrode, potassium tetraphenylborate direct potentiometric titration, were satisfactory results are obvious end point jump, pH wide range of applications, with The analysis of silicate sample has the advantages of simple method and good accuracy, and the solubility product of tetraphenylboron and potassium is measured by electrode, which is 2.25 × 10 -8 at 20 ℃, which is in good agreement with the literature .