酸碱双电位滴定法的改进

IMPROVEMENT OF THE ACID-BASE DOUBLE-POINT POTENTIOMETRIC METHOD

改进了酸碱双点电位滴定法 ,导出了不受双点体积差影响的精确计算公式 ,并对其准确度进行了探讨。改进后的方法用于弱酸 HAc、弱碱 Na2 CO3及油脂酸价的测定实验表明 ,在一定条件下指示电极电位 E和过剩滴定剂浓度的对数 lg CB 线性关系良好 。

The acid base double point potentiometric method was improved.In this paper,an accurate calculation formulae of the acid base titration using double point potentiometric method has been described and the factors which affect the accuracy of measurement results has been discussed. The experiments which have been applied to the analysis of HAc,Na 2CO 3 and fish oil sample show that the linear relationship between E and lg C B is good under the given conditions and the results are satisfactory.