Record Display for the EPA National Library Catalog

RECORD NUMBER: 11 OF 35

OLS Field Name OLS Field Data
Main Title Comparison of Chemiluminescence and Ultraviolet Ozone Monitor Responses in the Presence of Humidity and Photochemical Pollutants.
Author Kleindienst, T. E. ; Hudgens, E. E. ; Smith, D. F. ; McElroy, F. F. ; Bufalini, J. J. ;
CORP Author ManTech Environmental Technology, Inc., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher c1993
Year Published 1993
Report Number EPA-68-DO-0106; EPA/600/J-94/261;
Stock Number PB94-182672
Additional Subjects Ozone ; Air pollution monitors ; Performance evaluation ; Humidity ; Water vapor ; Dew ; Photochemical reactions ; Air pollution monitoring ; Ultraviolet equipment ; Chemiluminescence ; Measuring instruments ; Comparison ; Air pollutants ;
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB94-182672 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 11/11/1994
Collation 37p
Abstract
The effect of water vapor on ozone monitoring instruments was investigated. Five UV type and two chemiluminescence type monitors were employed in this study. The results of the study indicate that in systems containing ozone, water vapor, and zero air only, the chemiluminescence monitors show a systematically higher reading than the UV monitors. Studies were also performed with a smog chamber with simulated polluted air and varying relative humidity. Although the presence of water vapor did not appear to be a problem, a slight positive interference was observed with the UV monitors. This interference was a result of the presence of toluene and some of its photooxidation products which are removed by the ozone scrubber and absorb some of the 254 nm radiaton used to measure ozone. It is concluded that under atmospheric conditions with moderate pollution and relative humidity, both types of instruments give satisfactory measurements for ozone.