NARSTO Measurement Methods Compendium Ozone Methods

1. Ozone (O₃)

   1. Chemiluminescence with Ethylene (C₂H₄) - (FRM)
      1. Basis: Chemiluminescence is the technique used to measure an analyte by mixing it with a species with which it reacts to form light. The intensity of the light is proportional to the concentration of pollutant, and this intensity can be measured.
      2. Range: 0.0-0.5 ppmv (FRM requirement)
      3. Minimum Detection Level: 0.002-0.005 ppmv
      4. Operating Temperature: N/A
      5. Known Interference: Water vapor (3% H₂O by volume at 25°C, based on tests at O₃ concentrations of 0.085 to 0.32 ppmv and at H₂O concentrations of 1 to 3%)
      6. Notes of Interest: Chemiluminescence with compounds other than ethylene can also be used to measure ozone (i.e., eosin-Y, Rhodamine B organic dye). Rhodamine B organic dye is the only other chemiluminescent compound to be named a Federal Equivalence Method (FEM).
      7. Instruments - Manufacturer:
         1. Beckman Model 950A Ozone Analyzer - Beckman Coulter
         2. Bendix or Combustion Engineering Model 8002 Ozone Analyzer - Bendix Corporation (refer to ABB Process Analytics)
         3. Columbia Scientific Industries Model 2000 Ozone Analyzer - Columbia Scientific Industries
         4. McMillan (MEC) Models 1100-1, 1100-2, and 1100-3 Ozone Meters - McMillan Electronics Corp. (a subsidiary of Columbia Scientific Industries)
         5. Meloy Model OA325-2R and OA350-2R Ozone Analyzers - Meloy Instruments Inc.
         6. Monitor Labs Model 8410E Ozone Analyzer - Monitor Labs Inc.
         7. Phillips PW9771 O₃ Analyzer - Phillips Electronic Instruments Inc. (utilizes measurement by chemiluminescence with Rhodamine B)
         8. Luminox Ozone Analyzer (LOZ-3) - Unisearch Associates, Inc. (utilizes measurement by chemiluminescence with eosin-Y. See Notes of Interest)
      8. References: 3, 4, 5, 12, 23 (Go to References)

   2. Ultraviolet (UV) Photometry - (FEM)
      1. Basis: Upon exposure to UV light, ozone will absorb some of the light and the intensity difference will be directly proportional to the concentration of ozone. Frequently the UV light source is a 254 nm emission line from a mercury discharge lamp.
      2. Range: 0-1 ppmv
      3. Minimum Detection Level: 2-5 ppbv
      4. Operating Temperature: 10°C-40°C
      5. Known Interference: Gaseous hydrocarbons with strong absorption at 254 nm, such as aromatic hydrocarbons (i.e., benzene and substituted benzene rings).
      6. Notes of Interest: N/A
      7. Instrument - Manufacturer:
         1. Advanced Pollution Instruments, Inc. Model 400 Ozone Analyzer - Advanced Pollution Instruments, Inc.
         2. Dasibi Models 1003-AH, 1003-PC, 1003-RS, 1008-AH, 1008-PC, and 1008-RS Ozone Analyzers - Dasibi Environmental Corp.
         3. Environics Series 300 Ozone Analyzer - Environics Inc.
         4. Environment S.A. Model O₃41M UV Ozone Analyzer - Environment S.A.
         5. Horiba Instruments Model APOA-360 Ozone Monitor - Horiba Instruments Inc.
         6. Monitor Labs Model 8810, ML9810, Ml9810B, ML9811, and ML9812 Ozone Analyzers - Monitor Labs Inc.
         7. Lear Siegler Model 8810 and ML9810 Ozone Analyzers - Lear Siegler Measurement Controls Corp. (available through Monitor Labs Inc.)
         8. Wedding & Associates Model 1010 Ozone Analyzer - Wedding & Associates Inc. (a subsidiary of Thermo Environmental Instruments Inc.)
         9. PCI Ozone Corporation LC-12 Ozone Analyzer - PCI-WEDECO
         10. Thermo Electron Models 49 and 49C U.V. Photometric Ambient O₃ Analyzers - Thermo Environmental Instruments Inc.
      8. References: 3, 4, 23 (Go to References)

   3. Differential Optical Absorption Spectrometry (DOAS) - (FEM)
      1. Basis: The wavelength of light where a distinct absorption peak occurs is determined for an analyte. A wavelength () on either side of the absorption peak is next determined. The intensity of a light source at wavelength () is measured, and then the intensity is measured again after the light passes through the analyte. The difference of the intensities is proportional to the concentration of the analyte.
      2. Range: 0-0.5 ppmv
      3. Minimum Detection Level: 0.0015 ppmv
      4. Operating Temperature: 20°C-30°C with -50°C to +50°C air temperature.
      5. Known Interference: Anything that interrupts the path of the laser will cause some interference (i.e., animals, cars, planes, etc.).
      6. Notes of Interest: DOAS is a long-path measuring technique. Measurements can be made in an optical pathway from 0.5 to 10 kilometers in length.
      7. Instrument - Manufacturer:
         1. OPSIS Model AR 500 System and System 300 Open Path Ambient Air Monitoring Systems for Ozone - manufactured by OPSIS AB of Sweden (available from ABB Power Plant Controls, Inc.)
      8. References: 3, 4, 14, 15, 23 (Go to References)

For definitions of method description terms see the Annotated Method Description Outline and Definitions.

For more information on FRM/FEM instrumentation, visit the AMTIC home page.