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本文通过对6种药物的杂多酸型电极对金属离子K_(ij)值与金属离子的结构参数和水合热力学参数关系的研究,发现离子的缔合不是离子产生干扰过程的控制因素。选择性主要取决于干扰离子的萃取性能或疏水性。推导并验证了pK_(ij)值与离子结构参数((z~2)/(r+0.85))及水合热力学参数(△G_(hydr))间存在线性关系。考虑到Born模型在电极复杂体系应用中的局限性,经过对离子结构参数函数关系全面考察,认为(z~2/r)~(-1)可取代(z~2)/(r+0.85)因子获得更好的拟合效果。
In this paper, we study the relationship between the K_ (ij) values of metal ions and the structural parameters and hydration thermodynamic parameters of heteropoly acid-type electrodes of six drugs. It is found that the association of ions is not the controlling factor of the interference process of ions. Selectivity depends mainly on the extraction performance or hydrophobicity of the interfering ions. The linear relationship between pK_ (ij) value and ionic structure parameters ((z ~ 2) / (r + 0.85)) and hydration thermodynamic parameters (△ G hydr) was deduced and verified. Considering the limitations of the Born model in the application of complex electrode systems, we consider that (z ~ 2 / r) ~ (-1) can replace (z ~ 2) / Factor to get a better fit.