铽-镧-磺基水杨酸共发荧光体系的研究和应用  

STUDY OF THE CO-FLUORESCENT EFFECT OF LANTHANUM ON THE Tb( Ⅲ )-SULFOSALICYLIC ACID REACTION SYSTEM AND ITS ANALYTICAL APPLICATION

作　　者：尹洪宗[1] 崔彦[1] 曲祥金[1] 朱贵云[2] 司志坤 

机构地区：[1]山东农业大学基础部,泰安271018 [2]山东大学化学系

出　　处：《理化检验（化学分册）》1999年第1期21-23,24,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

摘　　要：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 the binary complex Tb( Ⅲ)-SSA is remarkably en-hanced by about 57 times in the presence of lanthanum ion (Ⅲ). The experimental results showed that there is a co-fluorescent effect through the formation of the ternary complex Tb( Ⅲ)-La(Ⅲ)-SSA. The optimum conditions of the formation the above mentioned ternary complex and it fluorescent characteristics are studied thoroughly. Under the optimum condition, there is a linear relationship between the fluorecence intensity and terbium concen-tration in the range of 4. 8×10^(-10)-8×10^(-7) mg of Tb(Ⅲ) per liter. The proposed method has been applied to the determination of terbium in some artificial and standard samples of rare earth oxides with satisfactory results. The recovery of standard addition tests amounts to 99. 3%.

关 键 词：铽 镧 磺基水杨酸 共发荧光 稀土氧化物 测定 

分 类 号：O614.341[理学—无机化学]