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研究发现,稀土离子 La~(3+)的存在可使二元配合物 Tb~(3+)-磺基水杨酸体系的荧光强度增强57倍.通过试验确定了Tb~(3+)-La~(3+)-磺基水杨酸共发荧光体系的形成条件与影响因素,并研究了该体系的荧光特性.在最佳条件下,Tb~(3+)浓度在4.8×10~(-10)～8.0×10~(-7)mg·L~(-1)范围内与荧光强度成正相关关系,检出限为1.1×10~(-10)mg·L~(-1).利用该体系完成了合成样品与包头标准稀土氧化物中的铽的测定,结果满意.样品的加标回收率为99.3%.
It is found that the fluorescence intensity of Tb 3+ -sulfosalicylic acid system is increased by 57 times with the presence of rare earth ions La 3+ .The Tb 3+- The formation conditions and influencing factors of La ~ (3 +) - sulfosalicylic acid coexistent fluorescence system were studied, and the fluorescence characteristics of the system were studied. Under the optimal conditions, the concentration of Tb 3+ was between 4.8 × 10 ~ The detection limit was 1.1 × 10 ~ (-10) mg · L -1 in the range of (-10) ~ 8.0 × 10 -7 mg · L -1 and the fluorescence intensity was positively correlated with the fluorescence intensity. The determination of terbium in the standard rare earth oxides of Baotou and Baotou was completed by this system, and the results were satisfactory.The recoveries of spiked samples were 99.3%.