摘要
液/液界面上的电化学现象是近年来一个十分活跃的研究领域。由于界面上和有机相中的阻抗很大,液/液界面上的电化学测量需要使用四电极系统,将参比电极和对电极分别置于两相中。为补偿化学系统中的IR降使用了正相反馈技术。本文对四电极系统中恒电位器、恒电流器、阻抗测量系统和计算机控制的测量系统的电路原理作了介绍。测量系统采用了集成运算放大器。
Electrochemistry at the liquid/liquid (L/L) interface is an interesting and active field in recent years. Because the impedance in the organic phase and at the interface is very large, electrochemical measurement at the interface requires a four-electrode system with two reference electrodes and two counter electrodes set separately in two phases. The positive feedback technique is used to compensate the IR drop in the chemical system. The principles of the electronic circuits of pontentiostat, galvanostat, impedance measuring system and the computer-controlled measuring system arc introduced. The measurine system is based on the integrated operational amplifier.
出处
《分析仪器》
CAS
1990年第1期46-51,共6页
Analytical Instrumentation
