铕-噻吩甲酰三氟丙酮-氯化甲基三烷基铵-异辛基苯氧基聚乙氧基乙醇体系荧光分光光度法测定痕量铕

Spectrofluorophotometric Determination of Trace Europium in Europium(Ⅲ)-Thenoyltrifluoroaetone—Trialkyl Ammonium Chloride-Triton X-100 System

本文首次提出了Eu^(3+)-TTA-N_(263)-异辛基苯氧基聚乙氧基乙醇(Triton X-100)体系的荧光分光光度法测定铕。在此最佳条件下铕的测定下限可达0.9ng/ml,并可允许存在一定量的其它共存稀土离子。该法用于测定包头混合稀土氧化物中的痕量铕,获得较满意的结果。

The fluorescence characteristics of Eu(Ⅲ)-thenoyltrifluoroacetone-trialkyl ammon- nium chloride(N_(263)-Triton X-100 system have been studied. The fluorescence intensity can be increased about one-fold in the presence of N_(263)·Under the optimum conditions, Beer's law is obeyed in the range of 0～100 ng/ml for Eu_2O_3, and the determination limit is 0.9 ng Eu/ml. Other co-existing rare earth elements are tolerated 4～80 fold for the determination of 5 ng Eu_2O_3/ml. The proposed method provides a direct and rapid analytical procedure for the determination of trace europium in a nature mixture of rare earth elements. The results of sample obtained are in good agreement with recommended values.