小示波图及其应用

Small Oscillogram and Its Application

提出了小示波图的概念,建立了基于小示波图的示波计时电位法.在以汞电极为工作电极的示波计时电位法中,采用端点去极剂切割经典示波计时电位图后形成的小示波计时电位图(简称为小示波图).根据切割经典示波图所用的端点试剂不同,将小示波图分为三种类型.推导了小示波图的理论公式,提出了小示波图的调节方法,并将其用于几种物质的定量测定.研究表明,利用小示波图不仅能使在经典示波图端点附近不易准确测定的物质得以测定,还可以在宽广的电位窗口内灵活、稳定、灵敏、高选择性地进行示波测定.因此,小示波图示波测定法是对经典示波测定法的一个重要的补充和发展.

A small oscillogram and a new method of oscillographic determination based on it were presented. In oscillographic chronopotentiometry to employ Hg working electrode, oscillographic chronopotentiogram formed after classical oscillogram was incised by end depolarizer was called a small oscillogram. Three types of the small oscillogram could be obtained when different end depolarizer was applied to the incision of the classical oscillogram. The theory formula of the small oscillogram was deduced and the adjustment method of the small oscillogram was discussed. Then the oscillogram was applied to the determination of several medicines. Experimental results showed that the oscillographic determination with the small oscillogram could be used to not only the determination of substance whose incision produced near the end of classical oscillogram, but also the convenient, stable, sensitive and selective determination of many substances in a broad potential window. Thus, oscillographic analysis with the small oscillogram can be an important supplement and development for oscillographic analysis with the classical oscillogram.