恒速数字自动电位滴定仪的研制

Design of a digital automatic potentiometric titration instrument

报道了一种新型数字式自动电位滴定仪。仪器由马利奥特恒流器、石英计时器、精密恒流源、计量点自动判定控制器、指示电极（惰性电极和离子选择电极）和磁力搅拌器构成。仪器具有数字自动加液滴定功能和精密库仑滴定功能，不用预设滴定终点，不用滴定管，滴定剂用量用时间计量，分析结果的相对标准偏差≤0．1％（n＝4），操作使用十分简便。

A digital automatic pontentiometric titration instrument is reported which is composed of a Mariotte constant flow titrator, a quartz timer, a precision constant current source, an automatic stoichiometric point judgement controller, in dicator electrodes (inert electrode and ion selective electrode) and a magnetic stirrer. The instrument is able to provide functions of automatic digitalized titrant adding potentiometric titration and precision Coulometric titration without the need of presetting end point potential. The RSD of measurement results is ≤0. 1% (n= 4) and the operation is very convenient.