Abstract: A fluorescence enhancement phenomenon shown by adding scandium ion to thesamarium-thenoyltrifluoroacetone (TTA)-cetyltrimethylammonium bromide(CTMAB)-Triton X-100(TX-100) system was observed and the effect of the condi-tions on the system was studied in detail.The excitation and emission wavelengthswere 370 nm, 565 nm, 603 nm and 645 nm, respectively.The optimum conditionsforming Sm-Sc-TTA-CTMAB-TX-100 system were that the concentration of Sc³⁺was equal to 5.0× 10^-5 mol/L, pH was 7.7.Under these conditions, the fluores-cence intensity can be increased about 10 times higher than that of the system con-taining no Sc³⁺, and it was a linear function of the concentration of samariumn therange of 1.0 × 10^-9-4.0 × 10^-7 mol/L.The detection limit was 6.0 ×10^-10 mol/L.This system was used for the spectrofluorimetric determination of samarium withsatisfactory results.The nature of enhanced fluorescence was explained using in-tramolecular and intermolecular energy transfer theory.

Key words: Fluorimetry, Samarium, Scandium, Fluorescence enhancement