溶液络合物最大配位数核实法(Ⅱ)——锌(Ⅱ)、铅(Ⅱ)羟基络合物极谱研究

A METHOD FOR ASCERTAINING THE MAXIMUM LIGAND OF COMPLEXES IN SOLUTION (Ⅱ)——POLAROGRAPHIC STUDY OF HYDROXYCOMPLEXES OF ZINC(Ⅱ) AND LEAD(Ⅱ)

本文提出一种近似处理方法,将核实法推广到极谱法中有沉淀的体系。

The method for ascertaining the maximum ligand of complexes in solution was extended to the polarographic method and the systems with some precipitate. It was shown that there are the characteristics of W , function in the systems of hydroxy complexes of zinc(Ⅱ) and lead(Ⅱ ), and that the maximum ligand numbers of the two systems both are four, at 25℃ and NaOH concentra-when some precipitate occured, an approximate calculation of the experimental values of the degree of complexes Y_(0) was suggested and a correct fomu-la of the ligand concentrations derivated, thus Leden-Fronaeus-Hsu Kwang-hsien logrithmic functional extrapolation has been extended to the systems with some precipitate. As a consequence of the approximate method the consecutive stability constants at 25°C and ionic strength μ=3.0 were found to be. lgβ_(1) = 6.72, lgβ_(2) = 11.52, lgβ_(3) = 14.04> lgβ_(4)=16.30 for zinc(Ⅱ) hydroxy complexes and lgβ_(1) = 6.87, lgβ_(2)=10.60, lgβ_(3) = 12.80, lgβ_(4) = 14.95, for lead(Ⅱ) hydroxy complexes.