Overview
ISO 10313:1993/Amd 1:2024 amends the ISO 10313 chemiluminescence method for determining the mass concentration of ozone in ambient air. The amendment provides a consensus value for the ozone absorption cross-section at room temperature specifically at the mercury-line wavelength 253.65 nm (air) and updates key numerical constants used in concentration calculations. This update ensures improved consistency and traceability for ozone measurements and instrument calibration.
Key topics and requirements
- Scope & method: Amendment to the established chemiluminescence method for ambient ozone mass concentration (ISO 10313).
- Consensus absorption value: Adds a literature-backed consensus value for the ozone absorption cross-section at 253.65 nm, and references supporting publications (added References [7] and [8]).
- Updated numerical constants:
- Reference pressure changed from 101.3 to 101.325 (kPa).
- Reference temperature set to 298.15 K (room temperature).
- Mercury-line wavelength specified as 253.65 nm (previously 253.7 nm).
- Absorption coefficient (numeric constant) revised from 1.44 to 1.4214 (unit as defined in the standard).
- Documentation & traceability: Amendment cites a 2019 Metrologia review and a 2022 BIPM report for consensus and guidance on units/significant digits, improving reproducibility and standard conformity.
Applications
- Calibration and verification of ozone analysers using chemiluminescence detectors.
- Routine air quality monitoring by environmental agencies and networks measuring ambient ozone mass concentration.
- Laboratory quality assurance (QA/QC) and method validation where accurate conversion between optical absorption and mass concentration is required.
- Instrument manufacturers and metrology labs adopting harmonized constants for product specifications, data comparability, and regulatory compliance.
Who uses this standard
- National and regional environmental protection agencies
- Air quality laboratories and field monitoring teams
- Instrument manufacturers and calibration service providers
- Atmospheric scientists and metrologists involved in ozone measurement and standardization
- Standards bodies and conformity assessment organizations (ISO/TC 146, SC 3)
Related standards
- Other ISO standards and guidance developed by ISO Technical Committee 146 (Air quality) covering ambient atmosphere measurements and instrument performance. The amendment aligns ozone measurement practice with metrological recommendations cited in the new references.
Keywords: ISO 10313, ambient air, ozone, chemiluminescence method, ozone absorption cross-section, 253.65 nm, mercury-line wavelength, mass concentration, air quality monitoring, instrument calibration.
