Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Characteristics of Chemical Species in Gaseous and Aerosol Phase Measured at Gosan, Korea During ABC-EAREX2005

ABC-EAREX2005 기간 동안 제주도 고산지역 대기 중 가스상 및 입자상 물질의 분포특성

  • Moon K.J. (Department of Air Quality Research, National Institute of Environmental Research) ;
  • Han J.S. (Department of Air Quality Research, National Institute of Environmental Research) ;
  • Kong B.J. (Department of Air Quality Research, National Institute of Environmental Research) ;
  • Lee M.D. (Department of Air Quality Research, National Institute of Environmental Research) ;
  • Jung I.R. (Department of Air Quality Research, National Institute of Environmental Research)
  • 문광주 (국립환경연구원 환경진단연구부 대기환경과) ;
  • 한진석 (국립환경연구원 환경진단연구부 대기환경과) ;
  • 공부주 (국립환경연구원 환경진단연구부 대기환경과) ;
  • 이민도 (국립환경연구원 환경진단연구부 대기환경과) ;
  • 정일록 (국립환경연구원 환경진단연구부 대기환경과)
  • Published : 2005.12.01
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Abstract

In this study, the cyclone/denuder/filter pack sampling system was used to measure the daily concentrations of water soluble inorganic compounds of fine ($D_{p}< 2.5\;{\mu}m$) and coarse ($D_{p}<10{\mu}m$m) size fractions of aerosol and related gases at Gosan super site during ABC-EAREX 2005. The mean concentrations for $HNO_{3},\;HNO_{2},\;NH_{3}$, were 0.39, 0.08, and $0.29\;{\mu}g/m^3$. respectively. Average concentrations of sulfate, nitrate, and ammonium in $PM_{2.5}$ were 3.39, 1.06, and $1.04\;{\mu}g/m^3$, which occupied about $26\%$ of total $PM_{2.5}$ mass. In particular, more than half of these ionic species were found in size of less than $2.5\;{\mu}m$. Gas phase nitric acid concentrations have shown high correlation coefficient with $HNO_{2}$(R=0.80) and $O_{3}$(R=0.78), implying the active photochemical reactions from its precursors. Equivalent molar ratios between major ion components, $NH_{4}\;^{+}/nss\;SO_4\;^{2-},(0.83\;for\;PM_{2.5},\;0.86\;for\;PM_{10})$, revealed that the existing forms of the secondary aerosols were probably $(NH_{4})_{2}SO_{4}\;and\;(NH_{4})_{3}H\;(SO_{4})_{2}$. Especially, $(NH_{4}\;^{+}+K^{+}+Ca^{2+}+Mg^{2+})/(NO_{3}\;^{-}+nss\;SO_{4}\;^{2-}) (0.99\;for\;PM_{2.5},\;1.05\;for\;PM_{10})$ indicated that some of them existed not only as $NH_{4}NO_{3}$ but also as $CaSO_{4}\;or\;KNO_{3}$, which pointed out the probability of influences from the abundant soil components during Asian dust (AD) periods. These neutralized types of secondary aerosols showed that pollutants could be aged and transported from a distance.

Keywords

References

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