ISO 6142-1:2015/Amd 1:2020

Overview

ISO 6142-1:2015/Amd 1:2020 is an important amendment to the international standard governing the preparation of calibration gas mixtures through the gravimetric method for Class I mixtures. This amendment specifically introduces corrections to critical formulae found in Annex E and Annex G of the original 2015 edition. Authored and maintained by the International Organization for Standardization (ISO), this document ensures accuracy and consistency in gas analysis calibration processes worldwide.

Reliable calibration gas mixtures are crucial for precise gas analysis used in environmental monitoring, industrial safety, and scientific research. ISO 6142-1:2015/Amd 1:2020 addresses the precision of gravimetric preparation by correcting the mathematical expressions that underpin the formulation and uncertainty calculations of these mixtures.

Key Topics

• Gravimetric Method for Class I Mixtures
  The amendment focuses on the gravimetric method, a mass-based technique to prepare gas mixtures with high accuracy. Class I mixtures refer to those with composition levels requiring the most stringent accuracy control.

• Corrections to Formulae in Annexes
  The revised document updates several formulae critical for calculating molecular masses and uncertainty propagation, including:

  • Annex E: Corrections to formulae (E.3) and (E.4), which deal with molecular mass calculations.
  • Annex G: Updates to formulae (G.1) through (G.7), related to partial derivatives and propagation of distribution uncertainties in gas mixture components.

• Analytical Accuracy and Uncertainty
  The amendment enhances the reliability of analytical results by refining the mathematical basis for uncertainty estimation - a core aspect in the certification and use of calibration gases.

Applications

ISO 6142-1:2015/Amd 1:2020 is vital for laboratories and industries involved in:

• Calibration Gas Preparation
  Producers of calibration gas mixtures utilize the corrected formulae to ensure exact mixture concentrations, essential for equipment accuracy and regulatory compliance.

• Environmental Monitoring
  Accurate preparation of calibration gases supports environmental agencies in monitoring air quality by ensuring gas analyzers yield consistent and reliable measurements.

• Industrial Gas Analysis
  Sectors such as petrochemical, manufacturing, and automotive rely on precise calibration gases for emissions testing, process control, and safety evaluations.

• Scientific Research
  Research institutions benefit from the amendment by applying rigorously defined methods for gas mixture preparation in studies involving atmospheric composition, combustion analysis, and chemical process experiments.

Related Standards

• ISO 6142 Series
  ISO 6142-1 is part of the broader ISO 6142 series, which collectively provides methods for preparing and certifying calibration gas mixtures, including other parts focused on different classes of mixtures and preparation techniques.

• ISO/IEC Directives Part 1 & 2
  These directives outline the procedures for developing and maintaining ISO standards, ensuring consistent editorial and drafting practices for international usability.

• Gas Analysis Standards
  Related standards from ISO Technical Committee ISO/TC 158 cover various methodologies in gas analysis, including sampling, analysis techniques, and quality assurance.

Summary

ISO 6142-1:2015/Amd 1:2020 refines the gravimetric preparation method for Class I calibration gas mixtures by correcting key formulae related to molecular mass calculations and uncertainty propagation. This amendment enhances the accuracy and reliability of gas mixture preparation-foundational for precise gas analysis across environmental, industrial, and research fields. Implementing these corrections enables stakeholders to maintain compliance with international standards, ensuring analytical precision and operational safety.

Keywords: ISO 6142-1 amendment, calibration gas mixtures, gravimetric method, Class I gas mixtures, gas analysis standards, molecular mass correction, uncertainty calculation, calibration gas preparation, environmental monitoring, industrial gas calibration.