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本文对Gd和Sm—TTA—Phen—TritonX—100体系的共发光现象进行了较详细的研究,试验了实验条件的影响(pH、TTA、Phen、Gd、表面活性剂(Triton X—100)、有机溶剂、稀土干扰离子)。该体系的共发荧光的效应可用于测定超痕量的Sm~(3+),其浓度在1.0×10~(-9)——6.0×10~(-8)M范围内与荧光强度呈线性关系,检测限可达7.5×10~(-10)M,比文献提出的检定限降低了50倍。测定钐的灵敏度比没有Gd存在时Sm—TTA—Phen体系的灵敏度提高20多倍。
In this paper, the phenomenon of co-luminescence of Gd and Sm-TTA-Phen-TritonX-100 system has been studied in detail. The influence of experimental conditions (pH, TTA, Phen, Gd, Triton X-100, Organic solvents, rare earth interference ions). The co-fluorescence of the system can be used to determine the ultra-trace Sm ~ (3 +) concentration in the range of 1.0 × 10 -9 -9 6.0 × 10 -8 M with the fluorescence intensity The linearity limit of detection is up to 7.5 × 10 ~ (-10) M, which is 50 times lower than the limit of detection proposed in the literature. The sensitivity of the Sm-TTA-Phen system was twenty times more sensitive than that of the Sm-TTA-Phen system in the absence of Gd.