【摘要】 本文首次研究了钐（Sm）-钆（Gd）-二苯甲酰甲烷（DBM）-氨（NH₃）-丙酮体系的共发光效应,即加入Gd³⁺离子使Sm-DBM-NH₃-丙酮体系中Sm³⁺的特征荧光强度大大增强,约比原体系提高了近两个数量级。因此,可用来测定痕量Sm³⁺。Sm³⁺在1.0×10^-8～5.0×10^-7M浓度范围内与荧光强度呈线性关系,检出限为8.0×10^-9M（1.2ppb）,其最佳条件为:Gd³⁺浓度2.0×10^-5～1.6×10^-4M,pH 8.5～10.0,HDM浓度2.0×10^-4～4.0×10^-4M,丙酮浓度20%（v/v）。更多还原

【Abstract】 In this paper, a new fluorescence system was studied and a fluorescence enhanced phenomenon called columinescence effect was observed, which occurred on adding some rare earths to Sm-DBM-NH₃-acetone system, among which, Gd²⁺ increases the fluorescence intensity of the system by about 50 times. The optimum conditions are that the concentration of Gd³⁺ is equal to 2.0×10^-5～1.6×10^-4M and pH 8.5～10.0, the system can be used for determinaticn of trace amount of Sm³⁺ in the range of 10×10^-8～5.0×10^-7M. The deteetion limit of Sm^?+ is 8.0×10^-9M（1.2ppb）, It lowers by two to three orders of magnitude in comparison with the Sm-DBM-NH₃-acetone system.更多还原