偶氮溴膦-mk与钍的反应及其应用

Application of Bromophosphonazo-mk as a New Chromogenic Reagent of Th

在0.05—1.28N的硝酸介质中钍同偶氮溴膦-mK反应,形成蓝紫色络合物。络合物稳定48小时,λ_(max)=680nm,△λ=130nm,ε=8.55×10^(4),钍在0—30μg/25ml范围符合比尔定律。当体系中加入阳离子表面活性剂TPB后灵敏度至少提高三倍,钍在0—5μg/25ml范围内符合比尔定律,可用于微量钍的测定。

A colour reaction between bromophosphonazo-mk and thorium takes place instantaneously at an acidity of 0.05-1.28 N, forming a blue-violet complex. Sensitivity increases three times by the use of TPB as solubilizing agent. This method has been applied to the determination of thorium in geochemical samples.