Abstract
Abstract A method for the determination of indium at ng dm−3 levels in water sample is described. Indium is extracted into carbon tetrachloride as an ion pair of (5-sulfo-8-quinolinolato) indate(III) anion with tetradecyldimethylbenzylammonium chloride, and subsequently back-extracted into 0.3 cm3 of a nitric acid solution. The back-extracted solution, containing 100 μg cm−3 of palladium as a matrix modifier, is suitable for the determination of indium by electrothermal atomic absorption spectrometry. The extraction behavior of the ion associate was also compared with that of the 8-quinolinolato complex. The detection limit (3σ) for indium is 0.28 ng dm−3, based on a 2000-fold preconcentration. The proposed method is applicable to the determination of indium at ng dm−3 levels in water sample.
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