7-碘-8-羟基喹啉-5-磺酸-溴化十六烷基三甲铵荧光光度法测定痕量镥

Spectrofluorometric Determination of Lutetium With 7-Iodo-8-hydroxy-quinoline-5-suIfonic Acid and Cetyltrimethyl Ammonium Bromide

本文研究了镥-Ferron-表面活性剂三元荧光体系的荧光特性,各种表面活性剂中以溴化十六烷基三甲铵的增敏效果最佳,与相应的二元体系相比较,灵敏度提高近10倍。镥的测定下限可达8.8ng/ml。本法与P_(507)萃取色谱分离法相结合可用于天然混合稀土氧化物中痕量镥的测定,结果较满意。

A fluorescence system of Lu (Ⅱ)-ferron-sufactant has been studied. The fluorescence intensitycan be increased differently by variors surfactants. CTMAB is the best one. The fluorescence intensity of Lu (Ⅲ)-ferron-CTMAB system is increased by ten-fold than that of Lu(Ⅱ)-ferron system. The optimum conditions of the determination of Lu were defined. The determination limit is 8. 8 ng Lu/ml. A method has been established for the determination of Lu in mixture of rare earth oxides after the separation of extraction chro-matography by P507 with satisfactory results.