ISO 10313:1993

Overview

ISO 10313:1993 - Ambient air: Determination of the mass concentration of ozone - Chemiluminescence method specifies a standardized chemiluminescence technique for measuring ozone in ambient air. The method draws a continuous, constant-flow air sample through a particle filter into a reaction chamber where it mixes with excess ethylene. Ozone + ethylene react instantly to emit visible light (maximum near 400 nm); the emitted light, measured by a photomultiplier, is proportional to ozone concentration. The standard applies to mass concentrations from 2 µg/m³ to 10 mg/m³ at reference conditions (25 °C, 101.3 kPa).

Key topics and technical requirements

• Measurement principle: chemiluminescence (ozone + ethylene → visible emission ≈ 400 nm) with photomultiplier detection.
• Calibration: ultraviolet (UV) photometry (primary method) using a low‑pressure mercury lamp (253.7 nm) is specified for primary calibration. Transfer standards may be used if annually traceable to the UV standard.
• Sampling system:
  • Particle filter (ozone‑inert materials such as fluorocarbon polymer) to prevent particulate-induced ozone loss or optical scattering.
  • Sampling line of ozone‑inert material (glass or fluorocarbon polymer) kept as short as possible; recommended residence time