실제 대기의 광화학 반응 챔버로 사용되는 테플론 백의 오염도 평가
Wall Contamination of Teflon Bags Used as a Photochemical Reaction Chamber of Ambient Air
0
조회
0
다운로드
3
인용
0
참고문헌
키워드
초록
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/cm3 up to about 4,000 particles/cm3 and 1.3 ㎍/m3, 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.
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/cm3 up to about 4,000 particles/cm3 and 1.3 ㎍/m3, 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.
참고문헌 (19)
- 배귀남, "실내 스모그 챔버의 설계 및 성능평가", 한국대기환경학회지, 19(4), pp.437~449 (2003), 한국대기환경학회
- Bae, G. -N., "Effect of light intensity on the ozone formation and the aerosol number concentration of ambient air in Seoul", Particle and Aerosol Research, 4(1), pp.9~20 (2008)
- Bufalini, J. J., "Contamination effects on ozone formation in smog chambers", Environmental Science and Technology, 11, pp.1181~1185 (1977)
- Carter, W.P., "A smog simulation chamber for determining atmospheric reactivity and evaluating measurement techniques", Air and Waste Management Association's 2003 Annual Conference and Exhibition Proceedings (2003)
- Cocker, D. R., "State-of-the-art chamber facility for studying atmospheric aerosol chemistry", Environmental Science and Technology, 35, pp.2594~2601 (2001)
- Dodge, M. C., "Chemical oxidant mechanisms for air quality modeling: Critical review", Atmospheric Environment, 34, pp.2103~2130 (2000)
- Grosjean, D., "Wall loss of gaseous pollutants in outdoor Telfon chambers", Environmental Science and Technology, 19, pp.1059~1065 (1985)
- Hurley, M.D., "Organic aerosol formation during the atmospheric degradation of toluene", Environmental Science and Technology, 35(7), pp.1358~1366 (2001)
- Izumi, K., "Photochemical aerosol formation from aromatic hydrocarbons in the presence of NOx", Atmospheric Environment, 24A(6), pp.1433~1441 (1990)
- Kelly, N. A., "Characterization of fluorocarbon- film bags as smog chambers", Environmental Science and Technology, 16(11), pp.763~770 (1982)
- Kelly, N. A., "Tests for fluorocarbon and other organic vapor release by fluorocarbon film bags", Environmental Science and Technology, 19(4), pp.361~364 (1985)
- Lee, S. -B., "Smog Chamber Measurements, Chapter 8 in Advanced Environmental Monitoring", Springer, pp.124~ (2009)
- 이영미, "초기 톨루엔 농도가 톨루엔-NOx-공기 혼합물의광산화 반응에 미치는 영향- I. 가스상 물질의 변화", 한국대기환경학회지, 21(1), pp.15~26 (2005), 한국대기환경학회
- Lonneman, W. A., "Contamination from fluorocarbon films", Environmental Science and Technology, 15(1), pp.99~103 (1981)
- McMurry, P.H., "Gas and aerosol wall losses in Teflon film smog chambers", Environmental Science and Technology, 19(12), pp.1176~1182 (1985)
- A study on the smog mechanism and control technology, "Moon, K.-C.", Report of Korea Institute of Science and Technology to Korean Ministry of Science and Techology, 126~, pp.M1-0204-00-0049 (2004)
- Odum, J. R., "Gas", particle partitioning and secondary organic aerosol yields, 1996, pp.30, 2580~2585
- Park, J. Y., "Secondary organic aerosol formed by photochemical reaction in a smog chamber with the ambient air in Seoul", 2nd International Asian Aerosol Conference, pp.1245~1246 (2002)
- Simonaitis, R., "Evaluation of the condensed carbon bond (CB-IV) mechanism against smog chamber data at low VOC and NOx concentrations", Atmospheric Environment, 31(1), pp.27~43 (1997)