Spectrofluorimetric determination of terbium with terephthalic acid
来源期刊：Rare Metals2002年第4期
论文作者：ZHAO Guohu and ZHAO JunBasic Science Department, Gansu Agricultural University, Lanzhou , China
文章页码：255 - 259
摘 要：<正>A spectrofluorimetric method has been developed for the determination of terbium（III） based on the formation ofa complex with terephthalic acid [benzene-1,4-dicarboxylic acid （TPA）] in slighdy acidic aqueous solution in the presenceof gelatin. Terbium ion can form a stable complex with TPA with the stoichiometry of 1:2. The best excitation and maxi-mum emission wavelengths are observed at 260 nm and 545 nm, respectively. The fluorescence intensity of terbium com-plex gets the strongest within 20 min and remains stable up to 10 h, and it is proportional to terbium（III） concentration in therange of 4.0×10-5-1.6×10-7 mol·L-1 under the optimum conditions. The fluorescence system has good selectivity, sensitivityand stability. The relative standard deviation is still within ±4% in the presence of 1200-fold amounts of the other lanthanideions when the concentration of terbium（III） is 1.0×10-6 mol·L-1 and common co-existing ions hardly interfere the determi-nation. It has been applied to the direct fiuori
摘要：<正>A spectrofluorimetric method has been developed for the determination of terbium（III） based on the formation ofa complex with terephthalic acid [benzene-1,4-dicarboxylic acid （TPA）] in slighdy acidic aqueous solution in the presenceof gelatin. Terbium ion can form a stable complex with TPA with the stoichiometry of 1:2. The best excitation and maxi-mum emission wavelengths are observed at 260 nm and 545 nm, respectively. The fluorescence intensity of terbium com-plex gets the strongest within 20 min and remains stable up to 10 h, and it is proportional to terbium（III） concentration in therange of 4.0×10-5-1.6×10-7 mol·L-1 under the optimum conditions. The fluorescence system has good selectivity, sensitivityand stability. The relative standard deviation is still within ±4% in the presence of 1200-fold amounts of the other lanthanideions when the concentration of terbium（III） is 1.0×10-6 mol·L-1 and common co-existing ions hardly interfere the determi-nation. It has been applied to the direct fiuori
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