2-ヒドロキシ-5-スルホアニリン-N-サリチリデンによるインジウムの蛍光定量

概要

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Indium reacts quantitatively with 2-hydroxy-5-sulfoaniline-N-salicylidene (HSS) to form a fluorescent complex at pH. 5.0〜5.2. In 8 v/v% N, N-dimethyl-formamide (DMF), the fluorescence intensity of the complex is stable for at least 72 h. The analytical procedure is as follows : To a sample solution containing less than 10 μg of indium, were added 1 ml of 0.1 w/v% sodium fluoride solution, 2 ml of 0.1 w/v% HSS solution in DMF and 1 ml of 0.2 w/v% ammonium acetate solution. The pH of the solution was adjusted to 5.1±0.1 with ammonium hydroxide or hydrochloric acid and then the solution was diluted to 25 ml with water. After standing for 15 min, the fluorescence intensity was measured at 500 nm with excitation at 405 nm. By the use of 0.01,0.05 or 0.1 μg/ml uranine solution as a setting reagent, 0.03〜10 μg of indium was determined. The relative standard deviation was O.6% (n=5) for 1.6 μg of indium.Aluminium(III), gallium(III) and tin(II) gave serious positive errors. The proposed method was successfully applied to the determination of indium in zinc residue, where the indium was previously separated from interfering elements by extraction with isopropylether.
社団法人日本分析化学会の論文
1990-08-05