均一粒径イオン交換樹脂直接挿入/黒鉛炉原子吸光法によるガリウムの定量

概要

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Trace amounts of Ga were determined by graphite furnace AAS after anion-exchange resin separation with Tiron utilizing the direct one-bead-of-resin insertion technique. The analytical procedure is as follows; a 2-ml portion of sample solution containing less than 0.5μg Ga was transferred into a 15-ml stopped transparent test tube and 0.5ml of 1.0×10^<-4>M Tiron solution and 2ml of buffer solution (pH 5.5) were added. After dilution with water to 5ml, 10.0mg of anion-exchange resin was added and the mixture was shaken vigorously for 30 min. The liquid phase was discarded through a filter paper (5A) and the resin was washed three times with 5ml of buffer solution diluted to ten times. The resin was dried in a desiccator at room temperature and one bead of the resin was set in a cup type cuvette, the absorbance was then measured. The working curve for Ga was linear over the range of 0.05〜0.50μg. The relative standard deviation for five determinations of 0.50μg Ga was 3.85%. The detection limit, defined as three times the standard deviation of the reagent blank, was 1.5ng ml^<-1>. The tolerable amount of sulfate, nitrate and chloride ion increased ten-fold, one hundred-fold and one thousand-fold, respectively compared with the ordinary method by graphite furnace AAS. Al (III), Fe (III), In (III), and Mo (VI) were found to interfere.
社団法人日本分析化学会の論文
1994-12-05