Determination of Gallium and Indium in Environmental Samples by Inductively Coupled Plasma Mass Spectrometry.

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  • 誘導結合プラズマ質量分析法による環境試料中のガリウムとインジウムの定量
  • ユウドウ ケツゴウ プラズマ シツリョウ ブンセキホウ ニ ヨル カンキョウ シリョウ チュウ ノ ガリウム ト インジウム ノ テイリョウ

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Abstract

Analytical conditions of ICP-MS has been developed for precise and rapid determination of gallium and indium in environmental samples. The sample was digested with HF/HNO3/HClO4, then Ga and In were determined by internal standardisation method to compensate for non-spectroscopic interferences arising from matrix elements in the sample solution. Rhodium was found to be effective as an internal standard.<BR>Barium bivalent ion and 37Cl16O2 polyatomic ion interferences with 69Ga intensity became markedly, therefore a measurement of Ga at 71Ga was essential.<BR>Ga analytical results of eight certified reference materials showed good agreement with the reference values. The analytical precisions of Buffalo River Sediment and SL-1 were 1.3 and 0.4 % respectively.<BR>On the other hand, In analytical results were not obtained by proposed method in certified reference materials (Buffalo River Sediment, 1633a and JLK-1) since isobaric interference from tin could not be neglected, and it could not be detected in the other materials because of its low concentrations.<BR>The proposed method was applied to the determination of Ga and In in various environmental samples. Ga was detected in the range from 11.4 to 21.0μg/g in sediments, 6.94 to 14.7μg/g in sewage sludge, fly ash and suspended particulates. In was not detected in sediments and suspended particulates, while it was detected in sewage sludge and fly ash, but analytical results were not obtained because of significant isobaric interference from tin. Ga concentration was in the range from <0.01 to 1.1μg/l and In was in the range from < 0.01 to 0.30μg/l in river water (15 points) .<BR>The determination limits (10δ) of these elements were 0.01μg/l in solution, and 0.1μg/g in solid environmental samples.

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