Record Display for the EPA National Library Catalog
RECORD NUMBER: 24 OF 55
|OLS Field Name||OLS Field Data|
|Main Title||Effects of Activated Charcoal Filtration and Ozonation on Hydrocarbon and Carbonyl Levels of Ambient Air Used in Controlled-Exposure Chamber Studies of Air Pollutant Human Health Effects.|
|Author||Tilton, B. E. ; Bufalini, J. J. ; Meeks, S. A. ; Gay, B. W. ;|
|CORP Author||Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.|
|Additional Subjects||Air pollution effects(Humans) ; Test chambers ; Activated carbon treatment ; Ozonization ; Carbonyl compounds ; Hydrocarbons ; Ozone ; Air pollution sampling ; Health risks ; Respiratory diseases ; Silica gel ; VOCs(Volatile organic compounds)|
Air sampling experiments were done in 1985, 1987, and 1993 at the human-exposure chamber facility of the U.S. EPA Health Effects Research Laboratory in Chapel Hill, NC. Measurements of volatile organic compounds (VOCs) by GC-FID and aldehyde measurements by the DNPH silica gel cartridge method were made, comparing levels at the outside air intake to levels in the human controlled-exposure chamber. Ambient air passed through activated-charcoal filters can contain varying residual amounts of water vapor and gaseous pollutants such as hydrocarbons, oxygenates, and other organic and inorganic species. When the charcoal-filtered air stream is exposed to high-intensity radiation to generate ozone for use in human controlled-exposure experiments, there may be formation of compounds other than ozone. Results of measurements of some compounds of interest are discussed.