影响混合酸中各组分含量测定的因素及条件

Factors and Conditions in Determination of Each Component Acid From Mixed Acid

作者曾提出,两种一元弱酸混合酸以及强酸与一元弱酸混合酸中,第一终点pH>3.7的情况下,测定各组分酸含量的方法.在此基础上,本文在理论上推导出第一终点pH值测量误差△pH与分析结果的误差△V._2/V^T.之间的关系式,从而明确了影响误差的因素,并提出误差(△V_2)/(V^T.)≤1.0%时的测定条件以及第一终点pH<3.7时的测定方法.实验结果表明,如果能满足本文提出的条件,可以获得满意的结果.

In the fore previous paper, we reported a method for determination of each component acid from the mixture of two different weak monoacids as well as the mixture of strong and weak monoacids when the pH value of the first terminal point is over 3. 7. On the basis of this, in this paper we deduced the relation formula of the determining error of the pH value of first terminal point(△)pH) and the error of analytical result (△Ve2/VeT) theoretically, and defined the factor affecting the result error, and then reported the determinating conditions when the error △Ve2/VeT is less 1. 0%, and the method when pH value the first terminal point is less 3. 7. The experimental results show that perfect results will be obtained under above condition.