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多元线性回归已广泛用于多组份分光光度分析。本文首次提出在定pH滴定条件下,混合酸各组分浓度与滴定剂体积和溶液pH值之间关系的数学模型,采用多元线性回归求解,可方便地计算出混合酸各组分浓度。该法不需知道被测酸的离解常数,通过对二元、三元及四元混合酸体系分析,证明该法计算方便、分析准确度较好,适用于多组分混合酸的同时分析。
Multiple linear regression has been widely used in multicomponent spectrophotometry. In this paper, the mathematical model of the relationship between the concentration of mixed acids and the volume of titrant and the pH value of the solution under the condition of constant pH titration is proposed for the first time. By using multiple linear regression, the concentration of each component of mixed acid can be easily calculated. The method does not need to know the dissociation constant of the measured acid. The analysis of binary, ternary and quaternary mixed acid systems shows that the method is easy to calculate and has good analytical accuracy and is suitable for the simultaneous analysis of mixed acid components.