钍－对马尿酸偶氮氯膦－溴代十六烷基三甲胺体系显色反应的研究及应用

Colour Developing Studies of Thorium(Ⅳ)-Chlorphosphonazo P-Aminohippuric Acid-Cetytrimethyl Ammonium Bromide System and Its Applications

本文研究了钍－对马尿酸偶氮氯膦（ＣＰＡ）－溴代十六烷基三甲铵（ＣＴＭＡＢ）体系的显色反应。实验证明，在盐酸介质中，ＣＴＭＡＢ可增敏钦与ＣＰＡ的络合反应，λ＿（ｍａｘ）＝６８４ｎｍ，ε＝２．１×１０￣５．本法应用于测定稀土矿石中的微量铣，结果良好。

he colour developing reaction of thorium-chlorophosphonazo P-aminohippumric acid-cetyltrimethyl ammonium bromide system was studied. It was proved that this reaction can be en-henced by the addition of CTMAB in the presence of hydrochloric acid and can have the result of λ_(max)=684 nm and ε=2.1×10￣5. This method is satisfied for the determination of trace amounts of thorium in rare earth minerals.