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

실제 대기의 광화학 반응 챔버로 사용되는 테플론 백의 오염도 평가

  • 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)
  • 이승복 (한국과학기술연구원 환경복지연구단) ;
  • 배귀남 (한국과학기술연구원 환경복지연구단) ;
  • 이영미 (국립환경과학원 환경보건연구과) ;
  • 문길주 (한국과학기술연구원 환경복지연구단)
  • Published : 2013.09.30

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.

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Cited by

  1. Review of Recent Smog Chamber Studies for Secondary Organic Aerosol vol.32, pp.2, 2016, https://doi.org/10.5572/KOSAE.2016.32.2.131