Determination of HONO Concentration and Investigation on Its Formation Mechanism Using a Continuous Measurement System in Indoor Environment of an Apartment

아파트 실내 환경에서 실시간 측정시스템을 활용한 HONO 농도 측정 및 생성기작 연구

  • Park, Seung-Shik (Department of Environmental Engineering, Chonnam National University) ;
  • Hong, Jin-H. (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Lee, Jai-H. (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Kim, Young-J. (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology) ;
  • Cho, Sung-Y. (Department of Environmental Engineering, Chonnam National University) ;
  • Kim, Seung-J. (Department of Environmental Engineering, Chonnam National University)
  • 박승식 (전남대학교 환경공학과) ;
  • 홍진의 (광주과학기술원 환경공학과 환경모니터링 신기술 연구센터) ;
  • 이재훈 (광주과학기술원 환경공학과 환경모니터링 신기술 연구센터) ;
  • 김영준 (광주과학기술원 환경공학과 환경모니터링 신기술 연구센터) ;
  • 조성용 (전남대학교 환경공학과) ;
  • 김승재 (전남대학교 환경공학과)
  • Published : 2008.02.29


Nitrous acid (HONO) can be produced by heterogenous reactions of nitrogen dioxide on surface materials and direct emission from combustion sources. However, a little is known of indoor HONO levels or the relationship between residential HONO, NO, and $NO_2$ concentrations in occupied houses. Therefore, we measured simultaneously NO, $NO_2$, and HONO concentrations in living room of an apartment using continuous analyzers to study the production of HONO (June $22{\sim}30$, 2006). The 4-min average concentrations of indoor NO, $NO_2$, and HONO were 4.3 (range: $0.4{\sim}214.3$), 10.3 ($2.0{\sim}87.3$), and 1.8 ppb ($0.3{\sim}7.7$), respectively. Peak levels of HONO up to 7.7 ppb and 24-hr averages as high as 1.7 ppb were measured. In agreement with previous studies, indoor HONO concentrations increased during operation of an unvented gas range. Examination of the observed kinetics suggests that the secondary production of indoor HONO, possibly as a result of heterogeneous reactions involving $NO_2$ and $H_2O$ is associated with $[NO_2]^2[H_2O]\;(r^2=0.88)$ rather than with $[NO][NO_2][H_2O]\;(r^2=0.75)$. Three combustion experiments at nighttime were also carried out to investigate the effects of vented combustion on the HONO, NO, and $NO_2$ concentrations. It was found to release HONO for $10{\sim}15$ minutes after NO and $NO_2$ source was turned off, and peak values were finally attained. Compared to unvented combustion, peak $NO_2$ and HONO concentrations were 3.2 and 2.0 times lower at weak vented combustion (air flow: $340\;m^3/hr$) and 4.9 and 2.4 times lower at strong vented combustion (air flow: $540\;m^3/hr$), respectively, emphasizing importance of operating ventilation hood fan during combustion to improve indoor air quality.


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