Wall Contamination of Teflon Bags Used as a Photochemical Reaction Chamber of Ambient Air
- Wall Contamination of Teflon Bags Used as a Photochemical Reaction Chamber of Ambient Air
- 이승복; 배귀남; 이영미; 문길주
- Wall contamination; Smog chamber; Photochemical reaction; Ambient air
- Issue Date
- Particle and aerosol research; 한국입자에어로졸학회지
- VOL 9, NO 3, 149-161
- 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/㎤ up to about 4,000 particles/㎤ and 1.3 ㎍/㎥,
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.
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