オキシン塩のベンゼン抽出によるガリウムおよびインジウムの吸光光度定量

概要

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A recommendable spectrophotometric method has been developed for the determination of traces of gallium and indium by the extraction of the oxinates with benzene. Gallium and indium are transferred to benzene layer as yellow oxinates, which are produced in an aqueous medium at pH 5 initially, and they are measured spectrophotometrically. The maximum absorption of the oxinate of both gallium and indium in the extract is found to be at around 400mμ. Using 1-cm cuvettes, the optimum concentration range for the accurate determination is found to be from 1 to 40μg for gallium and 2 to 70μg for indium per 10 ml of organic solvents respectively. The molar extinction coefficient is calculated to be 7.18×10<SUP>3</SUP> in the case of gallium oxinate and 7.00×10<SUP>3</SUP> in that of indium oxinate.
社団法人日本分析化学会の論文