FIELD SCREENING FOR HALOGENATED VOLATILE ORGANIC COMPOUNDS Page: 3 of 43
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ABSTRACT
Western Research Institute (WRI) initiated exploratory work towards the development of
new field screening methodology and a test kit to measure halogenated volatile organic compounds
(VOCs) in the field. Heated diode and corona discharge sensors are commonly used to detect leaks
of refrigerants from air conditioners, freezers, and refrigerators. They are both selective to the
presence of carbon-halogen bonds. Commercially available heated diode and corona discharge leak
detectors were procured and evaluated for halogenated VOC response. The units were modified to
provide a digital readout of signal related to VOC concentration. Sensor response was evaluated
with carbon tetrachloride and tetrachloroethylene (perchloroethylene, PCE), which represent
halogenated VOCs with and without double bonds. The response characteristics were determined
for the VOCs directly in headspace in Tedlar bag containers. Quantitation limits in air were
estimated. Potential interferences from volatile hydrocarbons, such as toluene and heptane, were
evaluated. The effect of humidity was studied also. The performance of the new devices was
evaluated in the laboratory by spiking soil samples and monitoring headspace for halogenated
VOCs. A draft concept of the steps for a new analytical method was outlined. The results of the
first year effort show that both devices show potential utility for future analytical method
development work towards the goal of developing a portable test kit for screening halogenated
VOCs in the field.iii
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Schabron, John F.; Jr., Joseph F. Rovani & Bomstad, Theresa M. FIELD SCREENING FOR HALOGENATED VOLATILE ORGANIC COMPOUNDS, report, June 1, 2002; United States. (https://digital.library.unt.edu/ark:/67531/metadc788119/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.