Record Display for the EPA National Library Catalog


Main Title Study of Interferences in Ozone UV and Chemiluminescence Monitors.
Author Hudgens, E. E. ; Kleindienst, T. E. ; McElroy, F. F. ; Ollison, W. M. ;
CORP Author ManTech Environmental Technology, Inc., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.;American Petroleum Inst., Washington, DC.
Publisher 1994
Year Published 1994
Report Number EPA-68-D0-0106; EPA/600/A-94/149;
Stock Number PB94-197456
Additional Subjects Air pollution monitors ; Ozone ; Performance evaluation ; Air samples ; Measuring instruments ; Scrubbers ; Ultraviolet absorption ; Chemiluminescence ; Air pollution effects ; Moisture ; Photochemical reactions ; Oxidation ; Chemical reaction kinetics ; Organic compounds ; Reprints ;
Library Call Number Additional Info Location Last
NTIS  PB94-197456 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 12p
A study was conducted to examine interferences and other measurement anomalies in chemiluminescence and ultraviolet ozone monitors. Previous results had shown that there was a positive deviation in the chemiluminescence monitors and no direct interference with ultraviolet monitors due to the presence of water at non-condensing concentrations. The present study continues this effort, examining both potential positive and negative effects of moisture and other interferences on these monitors. Aromatic compounds and their oxidation products could potentially show a positive interference with ultraviolet monitors, and test measurements were made with aromatics such as toluene, benzaldehyde, and nitrotoluene to determine their possible retention in the ozone scrubber and their absorption in the cell as a function of the humidity. A detailed examination of the scrubbers used in ultraviolet ozone monitors has also been undertaken. Ozone scrubbers that have shown anomalous behavior in the field have been studied in various reduced-efficacy modes under controlled laboratory conditions. Longer term tests of unused scrubbers for possible ozone breakthrough under exposure to various simulated field conditions were initiated.