Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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The Relationship between the Estimated Water Content and Water Soluble Organic Carbon in PM10 at Seoul, Korea

서울시 PM10 내의 수용성 유기탄소와 수분함량과의 상관성 분석

  • Lee, Seung Ha (Air Quality Research Division, National Institute of Environmental Research (NIER)) ;
  • Kim, Yong Pyo (Department of Chemical Engineering & Materials Science, Ewha Womans University) ;
  • Lee, Ji Yi (Department of Environmental Engineering, Chosun University) ;
  • Lee, Seung Muk (College of Public Health, Seoul National University)
  • 이승하 (국립환경과학원 대기환경연구과) ;
  • 김용표 (이화여자대학교 화학신소재공학과) ;
  • 이지이 (조선대학교 환경공학과) ;
  • 이승묵 (서울대학교 보건대학원 환경보건학과)
  • Received : 2016.09.08
  • Accepted : 2017.01.23
  • Published : 2017.02.28
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Abstract

In this study, we have analyzed relationship between the measured Water Soluble Organic Carbon (WSOC) concentrations and the estimated aerosol water content of $PM_{10}$ (particulate matter with an aerodynamic diameter of less than or equal to $10{\mu}m$) for the period between September 2006 and August 2007 at Seoul, Korea. Water content of $PM_{10}$ was estimated by using a gas/particle equilibrium model, Simulating composition of Atmospheric Particles at Equilibrium 2 (SCAPE2). The WSOC concentrations showed low correlation with Elemental Carbon (EC), but Water Insoluble Organic Carbon (WISOC) were highly correlated with EC. It seemed that hydrophilic groups were produced by secondary formation rather than primary formation. As with the previous studies, WSOC showed good correlation with secondary ions ($NO_3{^-}$, $SO_4{^{2-}}$, $NH_4{^+}$), especially WSOC was highly correlated with $NO_3{^-}$ that is a secondary ion formed by photochemical oxidation from more local sources than $SO_4{^{2-}}$. No apparent correlation between the measured WSOC and estimated water content was observed. However, WSOC showed good correlation with estimated water content when it was assumed that relative humidity was higher than the deliquescence relative humidity of the system. In conclusion, WSOC is correlated with water content by hygroscopic ions and it is expected that nitrate play an important role among the water content and WSOC.

Keywords

References

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