用钯(Ⅱ)-1,10-邻菲啰啉-镉试剂 A-平平加体系测定钯的研究及应用

Determination of Palladium With 1,10-Phenanthroline-Cadion A-Peregal O System and Its Application

本文研究在非离子表面活性剂平平加(Peregal O)存在下,Pd^(2+)与1,10-邻菲啰啉(Phen),N-(对硝基偶氮苯)-对氨基偶氮苯(镉试剂A,Cadicn A)形成四元混配配合物的显色反应。实验表明,pH为8.2～10.5的缓冲介质中,平平加存在下,Pd^(2+)与Phen,Cadion A形成橙色配合物,λ_(max)=490nm,ε=8.01×10~4L·mol^(-1)cm^(-1),组成比Pd^(2+):Phen:CadionA=1:1:2,钯在0～20μg/25ml范围内服从比尔定律。本法操作简便,直接用于硅铝催化剂中微量钯测定,结果满意。

A simple, sensitive and selective method for the spectrophotometric determination of Pd has been developed. Palladium reacts with 1, 10-phenanthroline(phen), cadion A and peregal O to form a stable complex. The maximum absorption of the complex is at 490 nm, its apparent molar absorptivity is 8. 01×10~4 L·mol^(-1)·cm^(-1). The composition of Pd: phen: cadion A is 1: 1: 2. Beer′s law is obeyed for Pd in the range of 0～20μg/25ml. With EDTA and sodium potassium tartrate as masking agents, common ions do not interfere. The method has been applied to the determination of palladium in Pd-containing catalysts without separation.