Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Application of an In-situ Measurement System to Determine HONO Levels in an Indoor Environment

실시 측정시스템을 활용한 실내 환경에서 HONO 농도 조사

  • Hong, Jin-Hee (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST)) ;
  • Lee, Jai-Hoon (Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology (GIST)) ;
  • Park, Seung-Shik (Department of Environmental Engineering, Chonnam National University)
  • 홍진의 (광주과학기술원 환경공학과) ;
  • 이재훈 (광주과학기술원 환경공학과) ;
  • 박승식 (전남대학교 환경공학과)
  • Published : 2007.04.30
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Abstract

We developed an in-situ analyzer to understand the HONO levels in indoor environments. The in-situ measurement system utilizes a diffusion scrubber and luminol chemiluminescence to measure the HONO concentration with time resolution of 4-minute. Concentrations of NO, $NO_{2}$, and HONO were determined at an indoor air of an apartment for 9 days using the developed in-situ analyzer. Indoor HONO concentrations were highly elevated when a gas range was operated. Enhancements of the indoor NO, $NO_{2}$, and HONO concentrations during combustion indicate that the observed indoor HONO was formed by direct emission. In addition to the direct emission, the indoor HONO was partially generated from heterogeneous reactions of $NO_{2}$ on indoor surfaces, which was supported by strong relationships between peak NO, $NO_{2}$, and HONO concentrations, high HONO/$NO_{2}$ ratio and a weak correlation between NO and HONO concentrations. Additionally, three combustion experiments during the whole measurement period were performed to investigate the effects of unvented and vented gas burning on the HONO, NO, and $NO_{2}$ concentrations and their decay. The decay rate of the HONO concentration was significantly less than the NO and $NO_{2}$ decay rates for all the experiments, indicating that the lifetimes of trace nitrogen species in indoor environment varied in the order approximately HONO>$NO_{2}$>NO.

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References

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