Improvements in the precision and accuracy of elemental and isotopic analyses of geochemical samples by a laser ablation-ICP-mass spectrometer

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  • HIRATA Takafumi
    Laboratory for Planetary Sciences, Tokyo Institute of Technology
  • ASADA Yo-ichi
    Laboratory for Planetary Sciences, Tokyo Institute of Technology
  • TUNHENG Apinya
    Laboratory for Planetary Sciences, Tokyo Institute of Technology
  • OHNO Takeshi
    Laboratory for Planetary Sciences, Tokyo Institute of Technology
  • IIZUKA Tsuyoshi
    Laboratory for Planetary Sciences, Tokyo Institute of Technology
  • HAYANO Yumiko
    Laboratory for Planetary Sciences, Tokyo Institute of Technology
  • TANIMIZU Masaharu
    Institute for Frontier Research on Earth Evolution, Japan Marine Science & Technology Center
  • ORIHASHI Yuji
    Earthquake Research Institute, The Univ. Tokyo

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Other Title
  • レーザーアブレーション-誘導結合プラズマ質量分析法による地球化学試料の微量元素分析
  • レーザーアブレーション 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 チキュウ カガク シリョウ ノ ビリョウ ゲンソ ブンセキ

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Abstract

This paper describes advances in elemental and isotopic ratio measurements that have been made with inductively coupled plasma mass spectrometry (ICP-MS) coupled with a laser-ablation sample introduction technique. Laser ablation utilizing UV light (frequency quadrupled to 266 nm or quintupled to 213 nm by a Nd-YAG laser, or an ArF Excimer 193 nm laser) is now the most widely used system because of its higher analytical precision and analytical capability to most of solid samples. However, even with UV lasers, serious elemental fractionation may occur during laser ablation, mainly due to differences in the element volatility. Therefore, the reduction of elemental fractionation during ablation is necessary for further precise and accurate elemental and isotopic analyses of trace elements. This is particularly the case for high quality-isotope data for age determination. In the field of geochemistry, great efforts have been made to obtain accurate Pb/U ratios, because 206Pb/238U ratios provide chronological information. The basic problem is that Pb/U results using conventional LA-ICPMS techniques show serious fractionations of the ratio over a prolonged measurement. The observed Pb/U ratio increases during the measurement because of the greater volatility of Pb. The Pb/U elemental fractionation is successfully reduced by an active focus technique, chemically assisted-laser ablation technique, or by soft-ablation technique. Moreover, recently developed techniques including signal stabiliser, a correction for the slow response of a Faraday amplifier and removal of isobaric interference by cool plasma conditions, will also expand the application fields and analytical accuracies of the LA-ICPMS technique. Outlines of these techniques are introduced.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 53 (6), 491-501, 2004

    The Japan Society for Analytical Chemistry

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