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Characteristics of Nitrate (NO3-) Volatilization from Fine Particles (PM2.5) at 4 Measurement Sites in Seoul

미세입자(PM2.5)의 질산염 (NO3-) 휘발 특성 분석 -서울시 4개 측정지역을 중심으로-

  • Kim, Yoo-Jung (Department of Environmental Engineering, Konkuk University) ;
  • Jung, Sung-Woon (Department of Environmental Engineering, Konkuk University) ;
  • Kang, Choong-Min (Department of Environmental Health, Harvard School of Public Health) ;
  • Ma, Young-Il (Department of Environmental Engineering, Konkuk University) ;
  • Kim, Su-Hyang (Department of Advanced Technology Fusion, Konkuk University) ;
  • Woo, Jung-Hun (Department of Advanced Technology Fusion, Konkuk University) ;
  • SunWoo, Young (Department of Environmental Engineering, Konkuk University)
  • 김유정 (건국대학교 환경공학과) ;
  • 정성운 (건국대학교 환경공학과) ;
  • 강충민 (하버드 보건대학원 환경보건학과) ;
  • 마영일 (건국대학교 환경공학과) ;
  • 김수향 (건국대학교 신기술융합학과) ;
  • 우정헌 (건국대학교 신기술융합학과) ;
  • 선우영 (건국대학교 환경공학과)
  • Published : 2008.10.31

Abstract

The purpose of this study is to understand the impact that temperature and relative humidity have on the volatilization loss of particulate nitrate $(NO_3^-)$ from Teflon filters during measurements of ambient fine particles $(PM_{2.5})$. Fine particles $(d_p<2.5{\mu}m)$ were measured using an annular denuder system (ADS) at four representive areas in Seoul. The measurements were made during 28 different days at 24-hr sampling intervals from February 14 to October 15, 1997. In this study, nitrate losses. calculated by the ratio of nitrate on the nylon filter to their sum in both Teflon and nylon titters, varied seasonally in the following order: summer (45.5%) > spring (23.8%) > fall (20.6%) > winter (19.7%). The results showed strong correlations with temperature, but we did not observe any significant effects of relative humidity. However, we observed that both temperature and relative humidity influenced the ambient gas/particle nitrate ratio in a different case study using a denuder.

Keywords

Nitrate;Nitrate loss;Annular denuder system;Teflon filter;Nylon filter

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