Study on the co-luminescence system Sm-Gd-BPMPHD-CTMAB and its analytical application

It has been found that the Sm-BPMPHD-CTMAB ion association system shows a strong fluorescence intensity. In this system some rare earth ions, such as Lu³⁺, Y³⁺, Gd³⁺ and Tb³⁺, exert an evident fluorescence enhancement effect. The formation conditions of the system and the factors affecting the columinescence effect were studied in detail in order to determine trace amounts of Sm³⁺. Under optimum conditions a linear relationship was obtained between the fluorescence intensity and the Sm³⁺ concentration in the range of 5.0×10^?8–8.0×10^?6 mol·L^?1. The detection limit of Sm³⁺ was 2.0×10^?8 mol·L^?1. The determination gave satisfactory results.