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- NAKAGAWA YUSUKE
- Institute for Chemical Research, Kyoto University
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- TAKANO SHOTARO
- Institute for Chemical Research, Kyoto University
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- FIRDAUS M. LUTFI
- Department of Chemistry, FKIP, Bengkulu University
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- NORISUYE KAZUHIRO
- Institute for Chemical Research, Kyoto University
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- HIRATA TAKAFUMI
- Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University
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- VANCE DEREK
- Bristol Isotope Group, School of Earth Sciences, University of Bristol
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- SOHRIN YOSHIKI
- Institute for Chemical Research, Kyoto University
この論文をさがす
抄録
Natural variations in the isotopic composition of molybdenum (Mo) are showing increasing potential as a tool in geochemistry. Although the ocean is an important reservoir of Mo, data on the isotopic composition of Mo in seawater are scarce. We have recently developed a new method for the precise determination of Mo isotope ratios on the basis of preconcentration using a chelating resin and measurement by multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS), which allows us to measure every stable Mo isotope (Nakagawa et al., 2008). In this study, 172 seawater samples obtained from 9 stations in the Pacific, Atlantic, and Southern Oceans were analyzed, giving global coverage and the first full depth-profiles. The average isotope composition in δA/95Mo (relative to a Johnson Matthey Mo standard solution) was as follows: δ92/95Mo = -2.54 ± 0.16‰ (2SD), δ94/95Mo = -0.73 ± 0.19‰, δ96/95Mo = 0.85 ± 0.07‰, δ97/95Mo = 1.68 ± 0.08‰, δ98/95Mo = 2.48 ± 0.10‰, and δ100/95Mo = 4.07 ± 0.18‰. The δ values showed an excellent linear correlation with atomic mass of AMo (R2 = 0.999). Three-isotope plots for the Mo isotopes were fitted with straight lines whose slopes agreed with theoretical values for mass-dependent isotope fractionation. These results demonstrate that Mo isotopes are both uniformly distributed and follow a mass-dependent fractionation law in the modern oxic ocean. In addition, Mo isotopic analysis revealed that δ98/95Mo of the standard used in this study was 0.117 ± 0.009‰ lighter than the Mo standard that was used by Archer and Vance (2008). A common Mo standard is urgently required for the precise comparison of Mo isotopic compositions measured in different laboratories. On the other hand, our results strongly support the possibility of seawater as an international reference material for Mo isotopic composition.
収録刊行物
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- GEOCHEMICAL JOURNAL
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GEOCHEMICAL JOURNAL 46 (2), 131-141, 2012
一般社団法人日本地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390001204552170752
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- NII論文ID
- 130004469324
- 10030744677
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- NII書誌ID
- AA00654975
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- COI
- 1:CAS:528:DC%2BC38XpsVyqtb4%3D
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- ISSN
- 18805973
- 00167002
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- NDL書誌ID
- 023602408
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可