三乙烯四胺螯合电导滴定法测定常量铜离子浓度

使用分光光度法与电导滴定法测定三乙烯四胺与Cu2 所形成的螯合物的配位数,结果表明Cu2 与三乙烯四胺可以定量地形成四配位螯合物,而且配合过程速度很快,螯合物稳定。在用三乙烯四胺水溶液滴定Cu2 过程中,体系的电导率快速下降,在滴定终点电导率发生了清晰的转变。建立了测定Cu2 含量的一种新方法—三乙烯四胺螯合作用电导滴定法,考察了各种因素对分析方法的影响,优化了分析条件。

Determination of copper ion concentration by Conductometric titration method using Chelate complexTriethylenetetramine as the titration agent

Cooperate process of triethylenetetramine with cupric ion was studied by using spectrophotometric analysis and conductometric titration.The experimental results showed that the chelate complex formed with four coordinations between triethylenetetramine and cupric ion).While the titration of triethylenetetramine aqueous solution against Cu~(2 ) solution were performanced,the conductivity of aqueous solution decreased rapidly,and breakover occurred at the end point of titration.Based on the fact,a novel measurement method for Cu~(2 ) concentration by conductometric titration using triethylenetetramine.was put forward in this work,The effects of some factors such as the pH values and the coexisting ions or cations in aqueous on the analysis results were examined,and the analysis conditions were optimized.This method has the advantages of high sensibility,better selectivity and convenient.