Rapid determination of seven trace elements in rock reference samples by ICP-MS.

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  • 誘導結合プラズマ質量分析法による標準岩石試料中微量元素の迅速定量
  • 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 ヒョウジュン

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Abstract

The application of ICP-MS for the rapid and very sensitive determination of seven trace metals in silicate rock samples is investigated. The rock sample of 0.1 g was decomposed with HNO3-HClO4-HF, then evaporated to dryness. The residue was dissolved in 2 ml HNO3 and made up to 100 ml with water. Since even small amounts of HClO4 remaining could lower the determined values, complete evaporation of HClO4 was performed. In the determination of Ge, the use of HCl for sample digestion lowered the values. Because our experiments showed that HClO4 did not affect the Ge determination, it is likely that Cl- ion exerts its effect on the Ge determination during the acid digestion process. It has been reported that both 58FeO+ and 58NiO+ interfere with the determination of 74Ge. Also, the coexistence of 114Sn interferes with the determination of 114Cd. However, in most cases of rock analysis, these kinds of interference are not significant. When such interference is observed, 76Ge and 111Cd can be effectively used. Analytical results of ten GSJ rock reference samples using the simple and rapid method described above were in good agreement with reference values.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 39 (4), T55-T59, 1990

    The Japan Society for Analytical Chemistry

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