摘要
本文提出了电流反馈示波极谱滴定法的原理、仪器装置及操作技术。为了提高去极剂切口的灵敏度,可将dE/dt信号转换为电流信号后再反馈回电解池以补偿充电电流,一般可将切口灵敏度提高1至5倍,图形分辩率也较经典方法高,从而使滴定终点的变化更为敏锐,扩大了示波极谱滴定的应用范围。推导了电流反馈的交流电流极化理论公式,分析了电流反馈对示波极谱图形、去极剂切口灵敏度及切口电位的影响。
The theory and practice of oscillo-graphic Chronopotentiometric titrations using feeding back current are presented. In ordinary oscillo-graphic titrations, charging current is very large in comparison with the Faradaic current. Since the charging current is proportional to dE/dt, it is possible to compensate it by feeding a current proportional to dE/dt back into the electrolytic cell. In such a way, the incision of depolarizers becomes more sensitive and the end-point detection is much sharper. Many titrationsthat can not be done in ordinary oscillo-graphic chronopotentiometric titrations can be carried out with feeding back current technique.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1990年第6期554-560,共7页
Acta Chimica Sinica
基金
国家自然科学基金
