PVC膜修饰电极上零电流示波电位滴定法测定硼的研究

以氯化十六烷基吡啶（ＣＰＣ）和氟硼酸钠形成的离子缔合物为活性物质，制成ＰＶＣ膜涂层石墨电极，提出了一个快速测定硼的零电流示波电位滴定法。以ＣＰＣ为滴定剂，用ＰＶＣ膜电极为指示电极，甘汞电极为参比电极，利用阴极射线示波器荧光屏上荧光点的突然位移来指示ＣＰＣ滴定硼的终点，具有灵敏、准确、快速等特点，用该法测定玻璃中的硼，结果良好。

Zero current Oscillo potentiometric Titration of Boron with PVC Membrane modified Electrodes

PVC membrane modified graphite electrodes with cetylpyridium chloride sodium fluoroborate have been employed for the rapid determination of boron by zero current oscillo potentiometric titration The PVC membrane modified electrode is used as an indicator electrode,while the calomel electrode as a reference electrode Cetylpyridium chloride(CPC)solution is used as titrant The end point of titration of boron by CPC is indicated by the sudden movement of a fluorescent spot on the screen of the cathode ray oscillograph This new method features sensitivity,precision and rapidness Results of boron determination in glass agree quite well with the reference values