オhe fluorescent reagent, salicylaldehyde-5-bromo-salicyloylhydrazone (SABSH) was synthesized and its ionization constants were determined spectrophotometrically. The fluorescent reaction of this reagent with gallium ...オhe fluorescent reagent, salicylaldehyde-5-bromo-salicyloylhydrazone (SABSH) was synthesized and its ionization constants were determined spectrophotometrically. The fluorescent reaction of this reagent with gallium was studied. Based on this chelation reaction, a highly sensitive spectrofluorometric method was developed for the determination of gallium in a ethanol-water (3+2, V/V) medium at pH 2.3. Under these conditions, the GaⅢSABSH complex has excitation and emission maxima at 390 and 457 nm, respectively. The linear range of the method is from 0.0 to 1×10-4 g/L and the detection limit is 4×10-7 g/L of gallium when a standard additions method is used. The molar ratio of gallium to the reagent is 1∶1. Interferences were evaluated. The method was successfully applied to the determination of gallium in soil samples. Extraction with n-butyl acetate from 6 mol/L hydrochloric acid medium was used to separate gallium from the interfering elements in the soil samples.展开更多
文摘オhe fluorescent reagent, salicylaldehyde-5-bromo-salicyloylhydrazone (SABSH) was synthesized and its ionization constants were determined spectrophotometrically. The fluorescent reaction of this reagent with gallium was studied. Based on this chelation reaction, a highly sensitive spectrofluorometric method was developed for the determination of gallium in a ethanol-water (3+2, V/V) medium at pH 2.3. Under these conditions, the GaⅢSABSH complex has excitation and emission maxima at 390 and 457 nm, respectively. The linear range of the method is from 0.0 to 1×10-4 g/L and the detection limit is 4×10-7 g/L of gallium when a standard additions method is used. The molar ratio of gallium to the reagent is 1∶1. Interferences were evaluated. The method was successfully applied to the determination of gallium in soil samples. Extraction with n-butyl acetate from 6 mol/L hydrochloric acid medium was used to separate gallium from the interfering elements in the soil samples.
