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Review of Federal Reference Method for Ozone: Nitric Oxide-Chemiluminescence
Citation:
Long, R., M. Beaver, R. Duvall, EricS Hall, AND S. Kaushik. Review of Federal Reference Method for Ozone: Nitric Oxide-Chemiluminescence. CASAC AMMS Teleconference on Federal Reference Method for Ozone: Nitric Oxide-Chemiluminescene, Research Triangle Park, NC, April 03, 2014.
Impact/Purpose:
The National Exposure Research Laboratory (NERL) Human Exposure and Atmospheric Sciences Division (HEASD) conducts research in support of EPA mission to protect human health and the environment. HEASD research program supports Goal 1 (Clean Air) and Goal 4 (Healthy People) of EPA strategic plan. More specifically, our division conducts research to characterize the movement of pollutants from the source to contact with humans. Our multidisciplinary research program produces Methods, Measurements, and Models to identify relationships between and characterize processes that link source emissions, environmental concentrations, human exposures, and target-tissue dose. The impact of these tools is improved regulatory programs and policies for EPA.
Description:
•The proposed new FRM measurement principle for ozone is based on quantitative measurement of the chemiluminescence emission from the gas-phase reaction of ozone in an air sample with nitric oxide (NO).•The chemiluminescence from the NO-O3 reaction (with excess NO) is proportional to the O3 concentration and is highly specific for O3 measurement, thus no auxiliary means (other than an air dryer) is required to reduce interference reactions. The measurement system is calibrated by reference to O3 concentration standards produced and assayed according to the same existing calibration procedure prescribed in 40 CFR 50, Appendix D for ethylene-chemiluminescence FRM analyzers.•An analyzer implementing this measurement principle would include:•A reaction cell where the gas phase reaction occurs and having a window through which the light can be detected•A photomultiplier tube (or equivalent) detector and associated electronics to measure the light produced•A pump and flow control system for sampling the ambient air•A dryer to control sample air humidity•A supply of NO contained in a high-pressure gas cylinder (which may be either internal or external to the analyzer).Office of