Development of quality control materials from CO/N2 gas mixture based on ISO Guide 80 for controlled environmental measurementsements

Authors

  • Adel Shehata SASO/NMCC
  • Abdulrahman AlAskar National Measurement and Calibration Center (NMCC), Saudi Standards, Metrology and Quality Organization (SASO), Riyadh, Kingdom of Saudi Arabia
  • Najjy AlYami National Measurement and Calibration Center (NMCC), Saudi Standards, Metrology and Quality Organization (SASO), Riyadh, Kingdom of Saudi Arabia
  • Abdullah AlOwaysi

DOI:

https://doi.org/10.21014/actaimeko.v14i1.1945

Keywords:

ISO Guide 80, QCM, homogeneity, stability, control chart

Abstract

This study presents the development of quality control materials (QCMs) for monitoring carbon monoxide (CO) concentrations using a validated gas chromatography-thermal conductivity detector (GC-TCD) method. The QCMs were prepared gravimetrically according to ISO 6142, using a three-step dilution process from pure CO and nitrogen. The resulting QCMs have a target amount fraction of 1000 µmol/mol (ppm). To assess homogeneity, the QCMs were analyzed using a validated GC-TCD system calibrated with certified reference materials (CRMs). One-way analysis of variances (ANOVA) revealed excellent homogeneity among the QCMs. Stability was evaluated based on previous studies of similar CO/N2 mixtures demonstrating long-term stability. Characterization of the QCMs by GC-TCD confirmed an amount fraction of 1004.65 µmol/mol, which was found in good compatibility of the gravimetric value. A quality control chart with upper and lower control limits was implemented for five months, validating the successful preparation of the QCMs. This research offers a reliable approach for laboratories to develop in-house QCMs for CO measurements, ensuring the accuracy and traceability of their results to the (SI) units.

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Published

2025-03-20

Issue

Vol. 14 No. 1 (2025)

Section

Research Papers

License

Copyright (c) 2025 Adel Shehata, Abdulrahman AlAskar, Najjy AlYami, Abdullah AlOwaysi

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