兴多偶氮氯膦-I与铍显色反应的研究

A Study on The Chromogenic Reaction of Beryllium With Khimduchlorophosphonazo-I

铍的光度测定已经进行了广泛的研究。主要的显色剂有两类:三苯甲烷染料和邻羟基偶氮染料。前者主要有铬菁R和铬天青S,在表面活性剂存在下,用三元络合物光度法测定铍,有很高的灵敏度。后者有铍试剂Ⅱ、铍试剂Ⅲ和铍试剂Ⅳ等,较新的显色剂是偶氮氯膦-Ⅰ。

BerylJium forms a red violef 1:1 complex vyith kJwmcluchlo rophosphojiazo-J rapidly in the presence of hexamethylene-tetramine buffer(pH 5),which exhibits maximum absorbance at 590 nm(molar absorptivity=9.44×10^(3)L·mol^(-1)).Beer’s law is obeyed for solution containing 0-25μg of beryllium in 25ml of solution.Interfering ions can be masked by the addition of small amounts of EDTA.