Development of rapid and precise Pb isotope analytical techniques using MC-ICP-MS and new results for GSJ rock reference samples

• TANIMIZU MASAHARU

  Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology

• ISHIKAWA TSUYOSHI

  Center for Advanced Marine Core Research, Kochi University

抄録

A rapid and precise routine Pb isotope analytical technique for rock samples was developed using multiple collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The mass discrimination of the Pb isotope ratios was corrected with the ²⁰⁵Tl/²⁰³Tl ratio of a Tl isotope reference material (NIST SRM 997) added to samples. The optimization of the analytical parameters and the minimization of the memory and matrix effects enabled to acquire the Pb isotope data rapidly (three samples per hour) with a reproducibility of 0.01% by consumption of 150 ng Pb per analysis. Repeated analyses of a Pb isotope reference material, NIST SRM 981, gave the average values of ²⁰⁶Pb/²⁰⁴Pb = 16.9308 ± 0.0010, ²⁰⁷Pb/²⁰⁴Pb = 15.4839 ± 0.0011, and ²⁰⁸Pb/²⁰⁴b = 36.6743 ± 0.0030 (2σ).<br>Pb isotope ratios of eleven Geological Survey of Japan rock reference samples were determined using this technique. In anion-exchange chemical separation, complete removal of Hg and Tl from the Pb fraction was confirmed. It was revealed that the Tl-normalization minimized the matrix effects caused by remaining impurities and medium, and the reproducibility of seven independent analyses of JB-2 was comparable to that of NIST SRM 981. Pb isotope ratios obtained for the rock reference samples showed a good agreement with those given previously.

収録刊行物

• ＧＥＯＣＨＥＭＩＣＡＬ　ＪＯＵＲＮＡＬ

  ＧＥＯＣＨＥＭＩＣＡＬ　ＪＯＵＲＮＡＬ 40 (2), 121-133, 2006

  一般社団法人日本地球化学会

キーワード

• Pb isotope ratios
• GSJ reference rocks
• multiple collector ICP-MS
• Tl normalization
• matrix and memory effects

詳細情報

• CRID: 1390001204551158272
• NII論文ID: 130004469146
• NII論文ID: 10017551961
• NII書誌ID: AA00654975
• DOI: 10.2343/geochemj.40.121
• COI: 1:CAS:528:DC%2BD28Xks1Ojt7g%3D
• ISSN: 18805973
• ISSN: 00167002
• NDL書誌ID: 7854151
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7854151
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可