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-...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 Sc￣(3+)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 Sc￣(3+) , 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.展开更多
A new fluorescent reagent, salicylaldehyde-5-bromo-salicyloyhydrazone (SABSH ), was synthesized and its ionization constants were established spectropho-tometrically. The fluorescent reaction of this reagent with scan...A new fluorescent reagent, salicylaldehyde-5-bromo-salicyloyhydrazone (SABSH ), was synthesized and its ionization constants were established spectropho-tometrically. The fluorescent reaction of this reagent with scandium was studied in detail.Based on this chelation reaction, a spectrofluorimetric method was developed for the determi-nation of scandium in a water-ethanol(1:1, V/V) medium at pH 4. 8. Under these condi-tions, the Sc-SABSH complex has excitation and emission maxima at 392 and 466 nm, re-spectively. The linear range of the method is from 0.0 to 1.0μg/10 mL, the relative stan-dard deviation of the method is 0.95% and the detection limit is o. 15 ng/mL of scandium when a standard additions method is used in the assay. The molar ratlo of scandium to reagent is 1: 1. Interferences of forty other ions were studied. The method has been suc-cessfully applied to the determination of trace scandium in geologic samples-展开更多
文摘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 Sc￣(3+)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 Sc￣(3+) , 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.
文摘A new fluorescent reagent, salicylaldehyde-5-bromo-salicyloyhydrazone (SABSH ), was synthesized and its ionization constants were established spectropho-tometrically. The fluorescent reaction of this reagent with scandium was studied in detail.Based on this chelation reaction, a spectrofluorimetric method was developed for the determi-nation of scandium in a water-ethanol(1:1, V/V) medium at pH 4. 8. Under these condi-tions, the Sc-SABSH complex has excitation and emission maxima at 392 and 466 nm, re-spectively. The linear range of the method is from 0.0 to 1.0μg/10 mL, the relative stan-dard deviation of the method is 0.95% and the detection limit is o. 15 ng/mL of scandium when a standard additions method is used in the assay. The molar ratlo of scandium to reagent is 1: 1. Interferences of forty other ions were studied. The method has been suc-cessfully applied to the determination of trace scandium in geologic samples-
