Development of New Desolvating Sample Introduction System for Precise Isotopic Analysis of Fe by Multiple Collector-ICP-MS

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  • HIRATA Takafumi
    Laboratory for Planetary Sciences, Tokyo Institute of Technology
  • KOHGE Ichitaro
    Laboratory for Planetary Sciences, Tokyo Institute of Technology UV&CD system group 1 UV&CD engineering division, JASCO international

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Other Title
  • 多重検出器型誘導結合プラズマ質量分析法による高精度鉄同位体分析のための直接加熱型脱溶媒試料導入装置の開発
  • タジュウ ケンシュツキガタ 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 コウセイドテツ ドウイタイ ブンセキ ノ タメ ノ チョクセツ カネツガタ ダツヨウバイ シリョウ ドウニュウ ソウチ ノ カイハツ

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Description

A new desolvating sample introduction system has been developed for precise isotopic ratio measurements of 56Fe/54Fe using a multiple collector-inductively coupled plasma-mass spectrometry (MC-ICPMS). The production of 56ArO+ ions could be significantly reduced by a removal of water vapour using a membrane filter. Sample aerosol was directly heated up by a rod-heater through glass tubing, aiming at a higher separation efficiency of the water vapour from sample aerosol. This direct-heating technique could minimize the length of the membrane filter for desolvation down to the 300 ~ 350 mm level, which was almost order of magnitude shorter than that of conventional desolvating system using the membrane filter. The shorter membrane filter results in smaller memory effect as well as shorter washout time of the signal down to 2 ~ 3 minutes, which was at the 1/3 ~ 1/5 level compared with the conventional desolvating system. This is a very pleasing result because we can take full advantage of the rapidness of the analysis achieved by the ICP-MS technique, even with the desolvating sample-introduction system. The resulting instrumental sensitivity achieved here was identical to that obtained by the conventional solution nebulisation (2 V/μg g−1), indicative of no significant loss of analytes during the desolvating stage. In order to evaluate the analytical capability of the present sample introduction technique, the 56Fe/54Fe isotopic ratio for an Fe isotopic standard reference material (IRMM-014 SRM) was measured. The precision in the 56Fe/54Fe ratio measurements achieved from 2 μg of Fe was 0.04% (2SD, n = 60 × 5 runs), which was significantly smaller than the isotopic variation in the 56Fe/54Fe ratio typically found in nature.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 54 (5), 347-354, 2005

    The Japan Society for Analytical Chemistry

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