稀土共发光效应的研究(Ⅱ)-Sm-Tb-TTA-邻二氮菲体系的共发光效应及其分析应用

Studies on Co-luminescence Effect of Rare Earths(Ⅱ)--The Co-luminescence Effect of Sm-Tb TTA-Phenanthroline-System and Its Analytical Application

本文报道了Sm-Tb-TTA-邻二氮菲体系的共发光现象并进行了较详细的研究。该体系的最佳形成条件:Tb^(3+)的浓度为1-2×10^(-5)M,pH5.5-7.0.该荧光增强效应可用于测定超痕量的Sm^(3+),其浓度在1.0×10^(-9)-1.5×10^(-7)M范围内与荧光强度呈线性关系,检测限可达2.5×10^(-11)M。测定Sm^(3+)的灵敏度比Sm-TTA-邻二氮菲体系提高二个数量级。用标准加入法测定样品中的钐,结果满意。

A co-luminescence effect of Sm-Tb-TTA-phenanthroline(phen)system was first studied.We observed a new fluorescence-enhanced phenomenon,which occurred by adding some of rare earths to above system.Amony them,Tb^(3+) increases the fluorescence intensity of Sm-TTA-phen system by 2 orders of magnitude.The optium conditions to form the system are as follows:concentration of Tb^(3+) is equal to 1-2×10^(-5)M,and pHis 5.5-7.0.The enhancement effect can be used for the determination of ultratrace amounts of Sm^(3+),the detection limit is 2.5×10^(-11)M.