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基准试剂纯度测定的相对误差要求<0.05％,普通容量滴定法不能满足此要求,这是由于滴定终点靠目视法判定,滴定液的体积用刻度读数计算,存在主观误差较大,本文采用称量电位滴定法测定墓准试剂的纯度,准确度高,精密度可达相对误差0.05％。 一、基本原理 称量电位滴定法是用天平称量代替容积读数来确定滴定液的量,根据滴定过程中指示电极电位的变化来确定滴定终点的方法,在等当点附近,电位有突变,据此确定滴定终点。因此标准溶液浓度C以每克含若干毫
The relative error of the reference reagent purity determination requirements of <0.05%, the ordinary volumetric titration can not meet this requirement, which is due to the end of titration determined by visual method, the volume of titrant with scale readings, there is a large subjective error, this article called Quantitative titration of tantalum reagent purity, accuracy, precision up to a relative error of 0.05%. First, the basic principle Weighed titration method is to replace the volumetric readings with a balance to determine the amount of titration solution, according to the titration process changes in the electrode potential to determine the end of the titration method, in the vicinity of the equivalent point, the potential mutation, According to determine the titration end point. Therefore standard solution concentration C contains several milliliters per gram