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http://dx.doi.org/10.11629/jpaar.2013.9.3.149

Wall Contamination of Teflon Bags Used as a Photochemical Reaction Chamber of Ambient Air  

Lee, Seung-Bok (Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology)
Bae, Gwi-Nam (Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology)
Lee, Young-Mee (Environmental Health Research Division, National Institute of Environmental Research)
Moon, Kil-Choo (Center for Environment, Health and Welfare Research, Korea Institute of Science and Technology)
Publication Information
Particle and aerosol research / v.9, no.3, 2013 , pp. 149-161 More about this Journal
Abstract
Experiments on photochemical reactions of purified air alone in an indoor smog chamber were carried out after flushing Teflon bags with purified air for many hours in order to check the level of contamination on the chamber wall. Ozone concentrations were linearly increased from <4 ppb up to about 8 ppb with irradiation time for four hours. Outgassing of NOx from the chamber wall was found to be less than 1 ppb. New ultrafine particles were formed and grown up to about 70 nm during the photochemical reactions, and then total number and mass concentrations of particles were increased from <10 particles/$cm^3$ up to about 4,000 particles/$cm^3$ and $1.3{\mu}g/m^3$, respectively. The wall conditions of these Teflon bags flushed with purified air might not severly affect the chamber experimental results for photochemical reactions of polluted urban ambient air. The difference of gaseous species between two chambers was 2.4 ppb of ozone at most, indicating that the wall cleaning performance of two chambers was nearly similar.
Keywords
Wall contamination; Smog chamber; Photochemical reaction; Ambient air;
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