論文

査読有り
2008年12月1日

Precise isotopic analysis of Mo in seawater using multiple collector-inductively coupled mass spectrometry coupled with a chelating resin column preconcentration method

Analytical Chemistry
  • Yusuke Nakagawa
  • ,
  • M. Lutfi Firdaus
  • ,
  • Kazuhiro Norisuye
  • ,
  • Yoshiki Sohrin
  • ,
  • Keita Irisawa
  • ,
  • Takafumi Hirata

80
23
開始ページ
9213
終了ページ
9219
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1021/ac801383t
出版者・発行元
American Chemical Society (ACS)

It is widely recognized that the natural isotopic variation of Mo can provide crucial information about the geochemical circulation of Mo, and the ocean is an important reservoir of Mo. To obtain precise isotopic data on Mo in seawater samples using multiple collector-inductively coupled plasma mass spectrometry (MC-ICPMS), we have developed a preconcentration technique using 8-hydroxyquinoline bonded covalently to a vinyl polymer resin (TSK-8HQ). By optimizing the procedure, Mo in seawater could be effectively separated from matrix elements such as alkali, alkaline earth, and transition metals. With this technique, even with a 50-fold enrichment factor, the changes in the 98Mo/95Mo ratio during preconcentration were smaller than twice the standard deviation (SD) in this study. Mass discrimination of Mo isotopes during the measurement was externally corrected for by normalizing 86Sr/88Sr to 0.1194 using an exponential law. We evaluated δ98/95Mo to a precision of ± 0.08‰ (±2 SD)
this value was found to be less than one-third of previous reported values. Moreover, we were able to determine an accurate ratio for every pair of stable Mo isotopes, which was impossible with previous methods owing to the isobaric interference from the external elements (Zr and Ru). In this study, δ92/98Mo in seawater was first determined so that it had the smallest relative error. We applied the proposed method to four kinds of seawater samples. The Mo compositions were constant among them, with average δ98/95Mo and δ92/98Mo values of 2.45 ± 0.11 and -4.94 ± 0.09‰ (±2 SD), respectively. Our data indicate that seawater is enriched in heavy Mo isotopes than previously reported. © 2008 American Chemical Society.

リンク情報
DOI
https://doi.org/10.1021/ac801383t
URL
https://pubs.acs.org/doi/pdf/10.1021/ac801383t
ID情報
  • DOI : 10.1021/ac801383t
  • ISSN : 0003-2700
  • eISSN : 1520-6882
  • SCOPUS ID : 57449093574

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