トリオクチルホスフィンオキシド抽出分離-アルセナゾIII吸光光度法による地質試料中の微量ウランの定量

概要

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A rapid and precise method for the determination of trace amount of uranium in geological materials by trioctylphosphine oxide (TOPO) extraction-Arsenazo III spectrophotometry was presented. A sample (0.1〜1 g) was decomposed with a mixture of HNO_3-HC1O_4-HF, and evaporated to dryness. The residue was dissolved with (1+1) HNO_3, and mixed with 2 % NaF solution and 10 % ascorbic acid solution, followed by addition of nitric acid up to 2 M concentration. Uranium was then extracted with 2 ml of 0.1 M TOPO-cyclohexane. The organic phase was washed twice with 2 M HNO_3 containing NaF and ascorbic acid, and was mixed with Arsenazo III solution and butyl cellosolve. The absorbance of the admixture was measured at 653 nm using 5 cm cell. More than 0.2 ppm of uranium could be determined by the method and the relative standard deviation at 1 ppm uranium concentration was 13 %. Ten samples could be analyzed in 5 h. This method was applied satisfactorily to a variety of geological reference materials.
社団法人日本分析化学会の論文
1985-04-05