高等学校化学学报 ›› 1982, Vol. 3 ›› Issue (S1): 46.

• 研究论文 • 上一篇    下一篇

表面活性剂对镧、钇-8-羟基喹啉-5-磺酸萤光反应的敏化作用

史慧明, 崔万苍, 王如骥   

  1. 南开大学化学系
  • 收稿日期:1982-02-15 出版日期:1982-12-31 发布日期:1982-12-31

THE SENSITIZATION OF SURFACTANT ON THE FLUORESCENT REACTIONS OF LANTHANUM, YTTRIUM WITH OXINE-5-SULFONIC ACID

Shi Hueiming, Cui Wancang, Wang Ruji   

  1. Department of Chemistry, Nankai University, Tianjin
  • Received:1982-02-15 Online:1982-12-31 Published:1982-12-31

摘要:

本文讨论了阳离子表面活性剂——溴化十六烷基三甲基铵(CTMAB)对萤光反应敏化作用的机理;提出了镧、钇的萤光分析方法,并确定了萤光反应的最佳条件。镧、钇的三元络合物与其二元络合物相比,萤光强度分别增强了四倍和十倍。表面活性剂的引入也大大地增加了方法的选择性。在此基础上,设计了先测定钇含量,然后用简单的作图法测定镧含量的镧、钇联合测定法。用本法测定了混合稀土样中谰、钇的含量,方法简便,结果令人满意。

Abstract:

The fluorescent reactions of lanthanum, yttrium with oxine-5-sulfonic acid(H2QS) in the presence of cationic surfactant-cetyltrimethylammonium bromide (CTMAB) were studied. The sensitizing mechanism of CTMAB on the fluorescent reactions was discussed based on absorptivities and quantum efficiencies of the fluorescent complexes. The fluorimetric method for determination of La, Y was developed. The ternary complexes showed the maximum excitation wavelength at 393 nm, the maximum emission wavelength at 505 nm. In comparing with their binary complexes, the fluorescence intensity of the ternary complex increased by 4-fold in the case of La and 10-fold in Y. 2 ppb Y and 20 ppb La in the solution can be determined. The presence of surfactant also increases the selectivity of the reaction. Y can be determined satisfactorily, even if there is 500-fold excess of La. Based on this principle, the determination of La and Y in the rare earths was designed, by which Y was first determinedand then with a simple graphic method La was determined. Three mixed samples with different known content of rare earth elements were determined for Y and La, the coefficients of variation were less than 10%. Our experiment showed this method was simple and the results were satisfactory without any separation.

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