Tm^（3＋）－EDTA－H_2C_2O_4溶液荧光体系的研究

STUDY ON THE Tm￣(3+)-EDTA-H_2C_2O_4 SOLUTION FLUORESCENCE SYSTEM

本文首次找到了Ｔｍ３＋－ＥＤＴＡ－Ｈ２Ｃ２Ｏ２溶液荧光体系，发现Ｔｍ３＋在这个体系中能发出特征的荧光光谱对应于能级１Ｇ４→３Ｈ６的跃迁。同时对这个体系的溶液特性，发光机理以及分析应用分别进行了研究。该体系稳定性好，离子干扰小，操作简便，对于深入研究Ｔｍ３＋的荧光光谱和分析应用都是非常有意义的。

The Tm3+-EDTA-H2C2O4 solution fluorescence system was investigated and a line emission of Tm3+ at 455urn was discovered on excitation of the Tm3+ complexes using 360nm radiation.This emission of Tm3+ is caused by the transition of 1G4￣ 3H6.In this system the stable different-ligand complexes of[Tin EDTA (C2O4)]3-are formed in a wide range of PH from 6 to 14, which involve a metal and anions of both acids in a ratio of 1:1:1.The use of such spectroscopic properties for analytical purposes has also been studied in our work.The optimum conditions are as follows:7￣11 of PH,0.01-0.09mol .L-1 of EDTA and 0.020. 08mol.L-1 of H,C,O..The linear dynamic range is 100μg.ml-'-ling .ml-l of Tm2O3.The relative standard deviation is 4.3%.