한국대기환경학회지 (Journal of Korean Society for Atmospheric Environment)

  • 제31권1호
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  • Pages.28-40
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  • 2015
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  • 1598-7132(pISSN)
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  • 2383-5346(eISSN)
한국대기환경학회 (Korean Society for Atmospheric Environment)
권호 표지
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대전지역 대기 중 PM2.5의 유기탄소와 원소탄소의 계절별 특성 연구

Seasonal Characteristics of Organic Carbon and Elemental Carbon in PM2.5 in Daejeon

  • 김효선 (충남대학교 환경공학과) ;
  • 정진상 (한국표준과학연구원 대기환경표준센터) ;
  • 이진홍 (충남대학교 환경공학과) ;
  • 이상일 (한국표준과학연구원 대기환경표준센터)
  • Kim, Hyosun (Department of Environmental Engineering, Chungnam National University) ;
  • Jung, Jinsang (Center for Gas Analysis, Korea Research Institute of Standards and Science) ;
  • Lee, Jinhong (Department of Environmental Engineering, Chungnam National University) ;
  • Lee, Sangil (Center for Gas Analysis, Korea Research Institute of Standards and Science)
  • 투고 : 2015.02.02
  • 심사 : 2015.02.13
  • 발행 : 2015.02.28
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초록

To investigate the seasonal variations of carbonaceous aerosol in Daejeon, OC (organic carbon), EC (elemental carbon) and WSOC (water soluble organic carbon) in $PM_{2.5}$ samples collected from March 2012 to February 2013 were analyzed. $PM_{2.5}$ concentrations were estimated by the sum of organic matter ($1.6{\times}OC$), EC, water-soluble ions ($Na^+$, $NH_4{^{+}}$, $K^+$, $Mg^{2+}$, $Ca^{2+}$, $Cl^-$, $SO_4{^{2-}}$, $NO_3{^{-}}$). The estimated $PM_{2.5}$ concentrations were relatively higher in winter ($29.50{\pm}12.04{\mu}g/m^3$) than those in summer ($13.72{\pm}6.92{\mu}g/m^3$). Carbonaceous aerosol ($1.6{\times}OC+EC$) was a significant portion (34~47%) of $PM_{2.5}$ in all season. The seasonally averaged OC and WSOC concentrations were relatively higher in winter ($6.57{\times}3.48{\mu}gC/m^3$ and $4.07{\pm}2.53{\mu}gC/m^3$ respectively), than those in summer ($3.07{\pm}0.8{\mu}gC/m^3$, $1.77{\pm}0.68{\mu}gC/m^3$, respectively). OC was correlated well with WSOC in all season, indicating that they have similar emission sources or formation processes. In summer, both OC and WSOC were weakly correlated with EC and also poorly correlated with a well-known biomass burning tracer, levoglucosan, while WSOC is highly correlated with SOC (secondary organic carbon) and $O_3$. The results suggest that carbonaceous aerosol in summer was highly influenced by secondary formation rather than primary emissions. In contrast, both OC and WSOC in winter were strongly correlated with EC and levoglucosan, indicating that carbonaceous aerosol in winter was closely related to primary source such as biomass burning. The contribution of biomass burning to $PM_{2.5}$ OC and EC, which was estimated using the levoglucosan to OC and EC ratios of potential biomass burning sources, was about $70{\pm}15%$ and $31{\pm}10%$, respectively, in winter. Results from this study clearly show that $PM_{2.5}$ OC has seasonally different chemical characteristics and origins.

키워드

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