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《Chinese Journal of Analytical Chemistry》 1993-11
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Spectrofluorimetric Determination of Silver Using 3,5-Dibromosalicylaldehyde-thiosemicarbazone

Yang Changhui, Yang Zhibin , Zhang Chunming (Department of Chemistry, Jiangxi University, Nanchang 330047)  
3,5-Dibromosalicylaldehyde-thiosemicarbazone (3,5-DBSTS) is described as a new fluorimetric reagent for the determination of trace silver. 3,5-DBSTS is synthesized by 3,5-dibromosalicylaldehyde and thiosemicarbazide. Ag+ reacts with 3,5-DBSTS to form a complex which causes the fluorescence to quench, the extent of fluorescence quenching is linear over 0. 04-25μg/25ml for silver. The optimum pH range for the determination of fluorescence is 8-9 in buffer solution of borax-nitric acid. The molar ratio of complex is established to be 1 : 1. The fluorescence measurements are made at excitation and emission wave length of 385 and 500nm,respectively, using EDTA as masking agent, the method is free from interference of 14 cations investigated, and has been used to determine the trace silver in anode slime with satisfactory results.
【Fund】: 江西省自然科学基金
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