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示波电位滴定法是最近发展起来的一种新的电位滴定方法,已经实际应用于药物、合金和矿物的分析。本文用四苯硼钠滴定度米芬,用一个铂电极和一个银电极,示波电位法指示终点。度米芬是季铵盐药物,在一定条件下能与四苯硼钠定量生成沉淀。中国药典用四苯硼钠双相滴定法测定度米芬。双相滴定操作麻烦,有机相是氯仿,毒性较大。示波电位法装置简单,不需要外加电源,可以把两个电极直接接到示波器上。滴定过程中观察荧光屏上光点的移动情况。滴定终点到达之前,光点移动
Potentiometric titration is a new potentiometric titration method recently developed and has been applied to the analysis of drugs, alloys and minerals. In this paper, tetraphenylboron sodium titration Mi Fen, with a platinum electrode and a silver electrode, oscillometric potential endpoint. Domiphen is a quaternary ammonium salt drug, which can be quantitatively precipitated with sodium tetraphenylborate under certain conditions. Chinese Pharmacopoeia with tetraphenyl boron biphasic titration determination of dimention. Biphasic titration trouble, the organic phase is chloroform, toxicity. Oscillometric potential device is simple, do not need additional power, you can connect the two electrodes directly to the oscilloscope. During titration observe the movement of the spot on the phosphor screen. The spot moves before the titration end point arrives