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<p>This study evaluates&#xa0;the batch-to-batch pH reproducibility of the NMIJ pH Certified Reference Material (CRM) tetraoxalate, phthalate, equimolal phosphate, physiological phosphate and borate buffers. Values of certified pH(S) for each CRM issue for those solutions are presented for the measurement temperature 25&#xa0;°C. Values of |ΔpH(S)|&lt;0.003, the difference between the pH(S) of each new batch and the reference values <i>RV</i>, the mean of all pH(S) values over twenty-years-long period are in a good agreement with the previously published results of NIST longitudinal meta-analysis and may serve as an experimental confirmation for the requirement of reproducibility for pH primary method of measurements.</p>

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Batch-to-batch pH reproducibility for the NMIJ standard buffer solutions

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Igor Maksimov,
  • Yuta Kojima,
  • Toshiaki Asakai,
  • Masaki Ohata,
  • Chikako Cheong

摘要

This study evaluates the batch-to-batch pH reproducibility of the NMIJ pH Certified Reference Material (CRM) tetraoxalate, phthalate, equimolal phosphate, physiological phosphate and borate buffers. Values of certified pH(S) for each CRM issue for those solutions are presented for the measurement temperature 25 °C. Values of |ΔpH(S)|<0.003, the difference between the pH(S) of each new batch and the reference values RV, the mean of all pH(S) values over twenty-years-long period are in a good agreement with the previously published results of NIST longitudinal meta-analysis and may serve as an experimental confirmation for the requirement of reproducibility for pH primary method of measurements.