Improved method for Hf separation from silicate rocks for isotopic analysis using Ln-spec resin column

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Author(s)

    • SHINJO Ryuichi
    • Department of Physics and Earth Sciences, University of the Ryukyus
    • GINOZA Yuko
    • Department of Physics and Earth Sciences, University of the Ryukyus
    • MESHESHA Daniel
    • Department of Physics and Earth Sciences, University of the Ryukyus

Abstract

An improved chemical separation method for Hf isotope ratio measurement using both the thermal ionization mass spectrometer (TIMS) and the multiple collector-inductively coupled plasma-mass spectrometer (MC-ICP-MS) is presented in this paper. In the first column (2.5-ml Eichrom Ln-spec resin), Hf cut was collected with 2M HCl-0.2M HF after washing the major elements, HREE, Ti, Nb, and Zr. For further Hf purification, the second column (1-ml Ln-spec resin) chemistry was conducted in a manner similar to that of the first column. The first column is designed for treatment with a 0.5-g silicate rock sample for TIMS analysis. Thus, because the Hf amount required for MC-ICP-MS analysis is much lesser than that required for TIMS analysis, the column chemistry for MC-ICP-MS analysis can be scaled down, depending on the amount of digested sample. Although there is a need to improve the TIMS technique, the TIMS Hf data obtained for geological reference rocks and Ethiopian flood basalts after the application of the proposed separation methods are consistent, within analytical error, with the previously reported data obtained using the MC-ICP-MS. The advantages of the proposed method include a reduction in the amount of reagents used (hence, a consequent reduction in the blank contribution), reduction in the time required, and a simplified preparation requiring a fewer number of acids.

Journal

  • Journal of Mineralogical and Petrological Sciences

    Journal of Mineralogical and Petrological Sciences 105(6), 297-302, 2010-12-01

    Japan Association of Mineralogical Sciences

References:  22

Codes

  • NII Article ID (NAID)
    10027418664
  • NII NACSIS-CAT ID (NCID)
    AA11460926
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    13456296
  • Data Source
    CJP  J-STAGE 
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