溶媒抽出-逆抽出 : 黒鉛炉原子吸光法による天然水中の13族元素の高感度分析に関する研究

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The need for highly sensitive and reliable methods for the determination of ultratrace elements has been recognized in analytical chemistry and/or environmental science. The author has developed micro-volume back-extraction methods for the ultratrace analysis of gallium, indium and thallium. At first, the determination of gallium and indium at ng dm<-3> levels in natural water samples was investigated. Gallium or indium was extracted into carbon tetrachloride as an ion pair of 5-sulfo-8-quinolinol chelate anion with tetradecyldimethylbenzyl-ammonium chloride, and subsequently back-extracted into 0.3 cm^3 of nitric acid solution for determination by GFAAS. In the case of indium, the extraction behavior of the ion associate was compared with that of the 8-quinolinolato complex. Secondly, the determination of thallium at ng dm^<-3> levels in natural water samples was investigated. Thallium is extracted into chloroform as the dithizonate complex, and subsequently back-extracted into 0.3 cm^3 of a nitric acid solution. A speciation analysis of TlI) to Tl(I) with ascorbic acid. The detection limits obtained for these elements are sub ng dm^<-3> levels, based on more than 1000-fold preconcentration.
2000-10-05