通用示差电位滴定装置的研制及碳酸锂中氯的测定

Development of Common Differential Potential Titration Instrument and Determination of Cl - in Li 2CO 3

本文研制的通用示差电位滴定装置，通用性强，可以随意更换其离子选择性电极膜，成为溶液中被测离子的电化学传感器，结构简单，取样量少；采用示差电位滴定技术，试样池和参比池共用一片离子敏感膜，与一般双电极示差装置比较，其不对称电位可大为降低，与离子选择性电极的直接电势法比较，由于响应曲线微弯部分仍可利用，故可提高分析灵敏度。已应用于碳酸锂、金属钙、氮化铌等中Ｃｌ－的测定，结果满意。

A very common differential potential titration instrument has been reported.The membrane of ISE can be alternated as desired and formed as the electric chemical sensor of determinated irons in the sample solution.The instrumnt has simple structure with consumption of small amounts of sample solution .Comparing with the SIE direct potential method,the sensitivivity can be improved significantly.It has been applied to satisfactorily determine Cl - in Li 2CO 3 ,metal calcium and Nb 2O 5.