Boron Isotope Ratio Measurements by Negative Thermal Ionization Mass Spectrometry Method Using Boron-free Seawater

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概要

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• We used boron-free seawater as an ionization promoter for negative thermal ionization mass spectrometry to obtain correct and precise boron isotope ratios. The time profiles were recorded for a whole exhaustion process with 1–10 ng boron samples. From a maximum in the initial stable stage, the boron isotope ratios were obtained with 0.05% reproducibility from 1–10 ng and 50–400 ng boron samples. The observed boron isotope ratio (42⁄43) is 0.24841±0.0013 for NIST SRM 951, which was a little smaller than that obtained with Ca(NO3)2 as an ionization promoter (42⁄43=0.24900±0.00013). The negative mode results were normally larger than the positive mode results. The observed value (42⁄43) was corrected to an absolute value (10⁄11=0.2455,02461) using the Rayleigh fractionation factor (1.011835). The standard 0.2473 for Na2BO2+ (86⁄87) was also corrected to an absolute value (10⁄11=0.2459) using the Rayleigh fractionation factor (1.005666). The positive and negative mode results agreed well within experimental error.

• 社団法人 日本原子力学会の論文
• 2002-04-25

著者

• 苑田 晃成

  産業技術総合研究所

• Ooi K

  Health Technology Research Center National Institute Of Advanced Industrial Science And Technology (

• Makita Y

  National Inst. Of Advanced Industrial Sci. And Technol. Takamatsu

• Sonoda Akinari

  Health Technology Research Center National Institute Of Advanced Industrial Science And Technology (

• Hirotsu Takahiro

  Health Technology Research Center National Institute Of Advanced Industrial Science And Technology (

• SONODA Akinari

  Institute for Marine Resources and Environment, National Institute of Advanced Industrial Science an

• MAKITA Yoji

  Institute for Marine Resources and Environment, National Institute of Advanced Industrial Science an

• OOI Kenta

  Institute for Marine Resources and Environment, National Institute of Advanced Industrial Science an

• HIROTSU Takahiro

  Institute for Marine Resources and Environment, National Institute of Advanced Industrial Science an

• Sonoda Akinari

  Health Research Institute National Institute Of Advanced Industrial Science And Technology (aist)

• 苑田 晃成

  産総研健康

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