高等学校化学学报 ›› 1988, Vol. 9 ›› Issue (5): 438.

• 论文 • 上一篇    下一篇

示波极谱滴定的研究(ⅩⅩⅩⅦ)——双微铂电极示波极谱滴定的原理

杨昭亮, 高鸿   

  1. 南京大学化学系
  • 收稿日期:1986-07-10 出版日期:1988-05-24 发布日期:1988-05-24
  • 通讯作者: 杨昭亮

Investigations on Oscillopolarographic Titrations(XXXⅦ)——Principle of Oscillopolarographic Titrations at Two Micro Pt-Electrodes

Yang Zhaoliang, Gao Hong(H. Kao)   

  1. Department of Chemistry, Nanjing University, Nanjing
  • Received:1986-07-10 Online:1988-05-24 Published:1988-05-24

摘要: 本文对EDTA等试剂在双微铂电极示波极谱图上产生切口的原因进行了探讨。双微铂电极示波极谱图上EDTA的切口主要来源于EDTA在铂电极上的吸附,使氧在电极上的吸附过程受阻而降低了氧的还原电流,因而使每一个电极上的Ei~t曲线发生变形。双微铂电极上所得的E~t曲线是两个Ei~t曲线的叠加.因此在E~t曲线上出现了明显的折扭.在dE/dt~E曲线上出现切口。还解释了其它一些实验现象。

关键词: 示波极谱滴定, 双微铂电极示波极谱, 铂电极

Abstract: The symmetrical incisions occurring on oscillopolarograms obtained at two polarized micro Pt-electrodes when EDTAis present in solutions are not due to redox reaction of EDTAat Pt-electrodes. They mainly come from the adsorption of EDTAat Pt-electrodes which hinders the formation of an oxygen layer at Pt-electrodes. EDTAchanges the Ei~t curve of each Pt-electrode by shifting the upper left part of the curve to right and lower left part to left. The E~t curve obtained at two polarized micro Pt-electrodes is the superposition of Ea~t and-Eb~t EDTAshift gives sharp time lags on the final E~t curve and sharp incisions on dE/dt~E curve.

Key words: Oscillopolarographic titration, Oscillopolarograms on two polarized electrodes, Pt electrodes

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