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本文详细研究了冠醚对Eu-TTA荧光体系的增敏作用和稀土离子Dy~(3+)或Ho~(3+)对Eu-TTA-冠醚体系的荧光增强效应。对Eu-TTA-冠醚和Eu-Dy(或Ho)-TTA-冠醚体系,Eu的浓度分别在1.0×10~(-8)～4.0×10~(-6)mol/L,1.0×10~(-9)～1.0×10~(-7)mol/L和1.0×10~(-8)～9.0×10~(-6)mol/L范围内与体系的荧光强度呈线性关系,检测限分别为1.0×10~(-10)mol/L,1.0×10~(-11)mol/L和1.0×10~(-10)mol/L。采用多点增量标准加入法测定混合稀土样品中痕量的Eu,获得了满意的结果。
In this paper, the sensitization effect of crown ether to Eu-TTA fluorescence system and the fluorescence enhancement effect of rare earth ions Dy ~ (3+) or Ho ~ (3+) on Eu-TTA-crown ether system were studied in detail. The concentration of Eu in the Eu-TTA-crown ether and Eu-Dy (or Ho) -TTA-crown ether systems were 1.0 × 10-8 ~ 4.0 × 10 -6 mol / L, 1.0 × There was a linear relationship between the fluorescence intensity and the fluorescence intensity of the system in the range of 10 -9 to 1.0 × 10 -7 mol / L and 1.0 × 10 -8 -9.0 × 10 -6 mol / L, The detection limits were 1.0 × 10 ~ (-10) mol / L, 1.0 × 10 ~ (-11) mol / L and 1.0 × 10 ~ (-10) mol / L, respectively. Multi-point incremental standard addition method for the determination of trace rare earth Eu samples, obtained satisfactory results.