研究表明,在铽(Ⅲ)-均苯四甲酸(PMA)-对苯二甲酸(TPA)体系中加入一定量三苯基氧化膦(TPPO)能使体系荧光强度增大约一个数量级,稀土离子La3+,Gd3+,Y3+与Tb3+-PMA-TPA-TPPO形成的多核发光体系,具有很强的发光效果,据此建立了测定稀土样品中痕量铽的新方法,并且优化了最佳反应条件.方法线性范围为8.0×10-9～2.0×10-6mol/L,检出限为6.0×10-11 mol/L,用于人工合成稀土混合物样品的分析,结果满意.
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