【摘要】 研究了钍－间硝基偶氮氯膦（ＣＰＡ－ｍＮ）－溴代十六烷基吡啶（ＣＰＢ）三元体系显色反应，实验证明，在硝酸介质中，ＣＰＢ可增敏钍与ＣＰＡ－ｍＮ的络合反应，λ＝６９２ｎｍ，ε＝１．３×１０￣５．所介绍的方法应用于测定稀土矿石中的微量钍，结果良好。更多还原

【Abstract】 he colour developing reaction of Thorium-chloro-phosphon azo-mN cetylpyridinium systemis studied. It is demonstrated Bromide rated that the determination can be enhanced by the addi-tion of CPB in the presence of HNO₃ and do have a high absorbance of ε=1. 3×10￣5 at λ_max=692nm. This reaction has been used for the determination of trace amounts of Thorium in rave earthminerals with satisfactory results.更多还原