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目前,偶氮氯膦Ⅲ主要用于钍、铀等元素的分光光度法测定。偶氮氯膦Ⅲ同这些元素形成的络合物十分稳定,显色反应灵敏度很高,与四价钍生成有络色合物的克分子吸收系数达1.22×10~6。目前,矿石中钍的测定多用偶氮胂Ⅲ和钍试剂钍色法。本文提出利用长链铵,使偶氮氯膦Ⅲ与钍在其作用下,生成的紫蓝色三元络合物,用异戊醇-苯混合有机溶剂萃取该络合物,作钍的分光光度测定,试剂空白值小,灵敏度较高。同时制定了简易、快速的测定矿物岩石中微量钍的分析方法。
At present, chlorophosphonazo III is mainly used for spectrophotometric determination of thorium, uranium and other elements. Chlorophosphonazo Ⅲ complex formed with these elements is very stable, color reaction sensitivity is very high, with the formation of tetravalent thorium Complex with the molecular absorption coefficient of 1.22 × 10 ~ 6. At present, the determination of thorium ore with arsenazo Ⅲ and thorium thorium reagent color method. In this paper, the use of long-chain ammonium, the chlorophosphonazo Ⅲ and thorium in its role in the formation of the purple-blue ternary complex with isoamyl alcohol-benzene mixed organic solvent extraction of this complex for thorium spectroscopy Photometry, reagent blank value is small, high sensitivity. At the same time, a simple and rapid method for the determination of trace thorium in mineral rock was developed.