差数法により値付けした高純度酸素認証標準物質の開発

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  • 下坂 琢哉
    独立行政法人産業技術総合研究所計測標準研究部門
  • 加藤 健次
    独立行政法人産業技術総合研究所計測標準研究部門

書誌事項

タイトル別名
  • Development of Pure Oxygen Certified Reference Material Determined by Subtraction Method
  • アナリティカルレポート サスウホウ ニ ヨリ ネズケ シタ コウジュンド サンソ ニンショウ ヒョウジュン ブッシツ ノ カイハツ

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抄録

Certified reference materials of pure oxygen were produced by National Metrology Institute of Japan mainly for the metrological traceability source of JCSS oxygen in nitrogen standard gases. The property value of the certified reference material is the amount of substance of oxygen which was determined by the subtraction method described in ISO/IEC 6142:2001. The expected impurity components in the certified reference material were CO, CO2, CH4, N2O, H2O, Ar and N2. CO, CO2, CH4 and N2O in the certified reference material were determined by FT-IR with a long-path gas cell. Ar and N2 were determined by GC-TCD with an oxygen absorber, and H2O was determined by a capacitance hygrometer. The stability of the amount of substance of impurities was monitored. The impurities except for CO2 were not detected and were regarded as being stable. The amount of substance of CO2 seemed to increase. The uncertainty for long-term stability of the property value was determined from the expected increase of the CO2 amount of substance on the expiration date. The typical certified value and its expanded uncertainty (k = 2) are 0.9999993 mol mol−1 and 0.9 μmol mol−1, respectively. The dominant uncertainty for the certified value was the uncertainty for the impurity analysis and long-term stability. The stability was also monitored after the certification. The increase in the CO2 amount of substance is smaller than the uncertainty for the long-term stability, and drift of the amount of substance of oxygen is smaller than the expanded uncertainty of the certified value.

収録刊行物

  • 分析化学

    分析化学 62 (1), 11-17, 2013

    公益社団法人 日本分析化学会

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