Eu(Ⅲ)-TLA体系的荧光增强及其在测定痕量铕中的应用  

Fluorescence Enhancement of Europium (Ⅲ)-Trimellitic Acid System and Its Application to the Determination of Europium

作　　者：杜晓霞[1] 刘志国[1] 罗婕[1] 赵学辉[1] 

机构地区：[1]湖南工业大学包装新材料与技术重点实验室,湖南株洲412007

出　　处：《湖南工业大学学报》2010年第4期51-55,共5页Journal of Hunan University of Technology

基　　金：湖南省自然科学基金资助项目(08JJ5036);湖南省教育厅科研基金资助项目(08C057)

摘　　要：采用荧光光谱对比法,研究了Eu3+在偏苯三甲酸(TLA)为配体的水溶液中的荧光增强效果。研究结果表明,在pH值为6.3的水溶液中,偏苯三甲酸的敏化可使Eu3+荧光强度提高3个数量级;有表面活性剂TritonX-100存在时,稀土La3+能使Eu3+-TLA体系的荧光强度进一步增大约2个数量级。采用分子内、分子间能量传递模式解释了该体系在不同测试条件下的共发光机理。在最佳测定条件下,当Eu3+浓度在6.7×10-8～5.0×10-6mol/L的范围内时,其浓度与Eu3+-La3+-TLA-TritonX-100体系的荧光强度呈线性关系,且Eu3+在该体系中的检出限达到了8.0×10-9 mol/L。By the method of comparative analysis of fluorescence spectra, fluorescence enhancement of europium（In） was studied in aqueous solution with trimellitic acid （benzene-1, 2, 4-tricarboxylic acid （TLA）） as ligands. The results showed that the ligand sensitized improved the fluorescence intensity three orders of magnitude in aqueous solution at pH 6.3, and with surfactant TritonX-100 in aqueous solution at pH 6.7, rare earth La^3＋ increased the fluorescence intensity furtherly about two orders of magnitude. Both intermolecular and intra molecular energy transfer modes were applied to explain the cofluorescence mechanism of the system under the different test conditions. In the optimum determining conditions, when Eu^3＋ concentration was in the range of 6.7 ×10^-8 - 5.0 × 10^-6 mol/L, it had a linear relation with the fluorescence intensity of Eu^3＋-La^3＋-TLA- TritonX-100 system, and the limit of Eu^3＋ in the system was detected to be 8.0 × 10^-9 mol/L.

关 键 词：分析化学 荧光增强 共发光 偏苯三甲酸 铕 

分 类 号：O614.338[理学—无机化学] O656.21[理学—化学]