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STUDY OF INTERFERENCES IN OZONE UV AND CHEMILUMINESCENCE MONITORS
Citation:
Hudgens, E., T. Kleindienst, F. McElroy, AND W. Ollison. STUDY OF INTERFERENCES IN OZONE UV AND CHEMILUMINESCENCE MONITORS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-94/149 (NTIS PB94197456), 1994.
Description:
A study was conducted to examine interferences and other measurement anomalies in chemiluminescence and ultraviolet ozone monitors. revious 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 noncondensing concentrations. he present study continues this effort, examining both potential positive and negative effects of moisture and other interferences on these monitors. romatic 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. etailed examination of the scrubbers used in ultraviolet ozone monitors has also been undertaken. zone scrubbers that have shown anomalous behavior in the field have been studied in various reduced-efficacy modes under controlled laboratory conditions. onger term tests of unused scrubbers for possible ozone breakthrough under exposure to various simulated field conditions were initiated.
