Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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Study on Characterization of Hydrophilic and Hydrophobic Fractions of Water-soluble Organic Carbon with a XAD Resin

XAD 수지에 의한 친수성 및 소수성 수용성 유기탄소의 특성조사

  • Jeong, Jae-Uk (Department of Environmental Engineering, Chonnam National University) ;
  • Kim, Ja-Hyun (Department of Environmental Engineering, Chonnam National University) ;
  • Park, Seung-Shik (Department of Environmental Engineering, Chonnam National University) ;
  • Moon, Kwang-Joo (Climate & Air Quality Research Department, National Institute of Environmental Research) ;
  • Lee, Seok-Jo (Climate & Air Quality Research Department, National Institute of Environmental Research)
  • 정재욱 (전남대학교 환경공학과) ;
  • 김자현 (전남대학교 환경공학과) ;
  • 박승식 (전남대학교 환경공학과) ;
  • 문광주 (국립환경과학원 기후대기연구부) ;
  • 이석조 (국립환경과학원 기후대기연구부)
  • Received : 2011.02.01
  • Accepted : 2011.05.11
  • Published : 2011.06.30
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Abstract

24-hr integrated measurements of water-soluble organic carbon (WSOC) in PM2.5 were made between May 5 and September 25, 2010, on a six-day interval basis, at the Metropolitan Area Air Pollution Monitoring Supersite. A macro-porous XAD7HP resin was used to separate hydrophilic and hydrophobic WSOC. Compounds that penetrate the XAD7HP column are referred to hydrophilic WSOC, while those retained by the column are defined as hydrophobic WSOC. Laboratory calibrations using organic standards suggest that hydrophilic WSOC includes lowmolecular aliphatic dicarboxylic acids and carbonyls with less than 4 or 5 carbons, amines, and saccharides. While the hydrophobic WSOC is composed of compounds of aliphatic dicarboxylic acids with carbon numbers larger than 4~5, phenols, aromatic acids, cyclic acid, and humic-like Suwannee River fulvic acid. Over the entire study period, total WSOC accounted for on average 48% of OC, ranging from 32 to 65%, and hydrophilic WSOC accounted for on average 30.5% (9.3~66.7%) of the total WSOC. Based on the previous results, our measurement result suggests that significant amounts of hydrophobic WSOC during the study period were probably from primary combustion sources. However, on June 9 when 1-hr highest ozone concentration of 130 ppb was observed, WSOC to OC was 0.61, driven by increases in the hydrophilic WSOC. This result also suggests that processes, such as secondary organic aerosol formation, produce significant levels of hydrophilic WSOC compounds that add substantially to the fine particle fraction of the organic aerosol.

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