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 |
Checkout Status |
NTIS |
PB94-182672 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
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. |