伪极谱法对镉氟配合物积累稳定常数的测定

Determination of the Consecutive Formation Constants of Complexes for Cadmium in Sodium Fluoride System from Pseudo-polarogram Data

研究了用伪极谱法测定镉在氟化物体系中与氟形成配合物的积累稳定常数 .结果表明 :Cd( )在氟化物体系中的伪极谱行为符合可逆电极反应伪极谱理论 .在镉浓度为 2× 1 0 -7mol· L-1、p H=8的条件下 ,测得镉与氟形成配合物的组成分别为 Cd F+、Cd F2 ,其积累稳定常数分别为 2 .95和 3.4 2 。

The behavior of the pseudo polarogram of Cd 2+ in NaF system has been studied,which showed that it agreed with the theory of the pseudo polarogram of a reversible redox reaction.The compositions and formation constants of cadmium fluoride complex ions are CdF +,CdF 2, β 1=2.95,β 2=3.44, respectively for cadmium at the concentration of 2×10 -7 mol/L,pH=8.The experimented results agreed with literature data.