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本文同时利用难溶有机酸的沉淀反应和酸碱反应，提出了两维酸碱-沉淀滴定法。现有的各种酸碱滴定方法都不能用于酸离解常数十分相近甚至相同的各种酸的同时测定．但当各组分的溶度积有一定的差异时，本文方法可成功地用于这类混合酸的同时测定。主成分回归法用来处理两维滴定体积矩阵。用该法对邻、间、对-氯苯甲酸混合物进行测定，结果良好。同时本文还测定了邻、间、对-氯苯甲酸的固有溶解度和溶度积，并详细讨论了合适的pH测量范围。
In this paper, two-dimensional pH-precipitation titration method was proposed by using the precipitation reaction and acid-base reaction of insoluble organic acids. None of the existing acid-base titration methods can be used for the simultaneous determination of various acids with very similar or even dissimilar acid dissociation constants. However, when the solubility product of each component has a certain difference, this method can be successfully applied to the simultaneous determination of these mixed acids. The principal component regression method is used to process two-dimensional titration volume matrix. By this method for o-, m-, p-chlorobenzoic acid mixture was measured, the results were good. In addition, the inherent solubility and solubility product of o-, m- and p-chlorobenzoic acid were also determined. The suitable pH measurement range was discussed in detail.