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以酸碱电位滴定然后进行曲线拟合分析多种(多元)混合酸的方法,可以在不分离的情况下一次滴定分析出多种及多元混合酸的含量和电离常数。Ingman、Johansson、汪葆俊等人已经在这方面做了大量的工作。本文提出了图象计算分析法(即从图形上确定各种酸的pκ_A及个数m,并以线性回归法计算出各个酸的浓度)。这种方法的分析与计算简单、直观、可靠,能有效地应用于实际样品分析。理论基础推导如下: 假定有m种酸混合,其数学模型可表示为
Titration with acid-base potentials followed by curve-fitting analysis of multiple (mixed) mixed acids allows one-time titration of multiple and mixed acids and ionization constants without separation. Ingman, Johansson, Wang Baojun and others have done a great deal of work in this area. In this paper, an image calculation and analysis method is proposed (that is, the pK_A and the number m of various acids are determined graphically and the concentration of each acid is calculated by a linear regression method). The analysis and calculation of this method is simple, intuitive and reliable, and can be effectively applied to the actual sample analysis. The theoretical basis is derived as follows: Suppose there are m kinds of acid mixed, the mathematical model can be expressed as