苯－1，4－二甲酸体系荧光分析法测定铽

Fluorimetric Analysis of Terbium(Ⅲ) Ion Using Benzene 1,4 dicarboxylic Acid

Ｔｂ３＋与苯—１，４—二甲酸形成的络合物，在ｐＨ＝５．５时直接测定Ｔｂ３＋的含量，波长为λｅｘ／λｅｍ＝２６０／５４５ｎｍ，检出限为１．５５×１０－７ｍｏｌ／Ｌ，线性范围１．５５×１０－７～４．０×１０－５ｍｏｌ／Ｌ，线性相关系数及标准误差分别为０．９９９３和１．７％。回收率为９８．６％～１００．７％。

The fluorescence properties and emitting mechanism of the chalete of Tb 3+ with benzene 1,4 dicarboxylic acid were investigated.The optimal conditions for determining Tb 3+ and the interference of other rare earth ions as well as some common metal ions were studied.As the wave length of λ ex /λ em was 260/545 nm at pH 5 5,Tb 3+ concentration was determined with a lowest detection limit of 1 55×10 -7 mol/L,a linear range of 1 55×10 -7 ～4 0 ×10 -5 mol/L,a linear correlation coefficient (R) of 0 9993 and a relative standard deviation of 1 7 %. The recovery was achieved between 98 6% and 100 7%.