校正法非平衡电位自动滴定及其应用

NON-EQUILIBRIUM POTENTIAL AUTOTITRATION BY CALIBRATION METHOD AND ITS APPLICATIONS

文中描述了利用恒流泵代替数字滴定计构成微机控制自动电位滴定仪的组成以及利用校正法解决非平衡电位滴定中终点误差校大的问题。本法用于低浓度试液的沉淀滴定及氧化-还原滴定,均取得满意的结果。仪器设备较简单价廉,使用方便,对于慢反应的滴定及电极响应慢的场合均可较大地提高测定准确度和工作效率。

A microcomputer-based potential autotitrator using general peristaltic pump instead of digital titrator is described in this paper.The error of titration end-point in nonequilibrium poten- tial titration is decreased by calibration method.The method is used in titration of fluorine with Th(NO_3)_4 et al..The relative error of determination is less than 0.2% and the relative standard de- viation is about 0.5%.The instrument is simpler and cheaper to construct.The determination accura- cy and efficiency are greatly increased for the titrations of slower reactions and slower response elec- trodes.