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

Title
Wall Contamination of Teflon Bags Used as a Photochemical Reaction Chamber of Ambient Air
Authors
이승복배귀남이영미문길주
Keywords
Wall contamination; Smog chamber; Photochemical reaction; Ambient air
Issue Date
2013-09
Publisher
Particle and aerosol research; 한국입자에어로졸학회지
Citation
VOL 9, NO 3, 149-161
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/㎤ 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.
URI
http://pubs.kist.re.kr/handle/201004/46924
ISSN
17388716
Appears in Collections:
KIST Publication > Article
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