【Abstract】 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-更多还原