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  • 标题:Water-soluble Organic Carbon in Urban Aerosol: Concentrations, Size Distributions and Contribution to Particulate Matter
  • 本地全文:下载
  • 作者:Timonen H. J ; Saarikoski S. K ; Aurela M. A
  • 期刊名称:Boreal Environment Research
  • 印刷版ISSN:1239-6095
  • 出版年度:2008
  • 卷号:13
  • 期号:04
  • 出版社:Finnish Limnological Society
  • 摘要:

    The aim of this
    study was to characterize the concentrations and particle mass size
    distributions of water-soluble organic carbon (WSOC) in urban aerosols. The
    sample collection was carried out in spring 2006 at the SMEAR III station in
    Helsinki, Finland, by using a size-segregating method (MOUDI) and by collecting
    sub-micrometer fraction of aerosols on the filter. During the three-month
    measurement period, a major 12-day biomass burning pollution episode was
    observed. Concentrations of WSOC, organic carbon, monosaccharide anhydrides,
    inorganic ions and some organic acids (oxalic, succinic and malonic acid) were
    analyzed from the PM1 samples. The measured OC and WSOC
    concentrations varied in ranges 0.67–15.7 µg m–3 and 0.26–10.7 µg
    m–3, respectively. The WSOC/OC concentration ratio was between 0.30
    and 0.89 with an average of 0.54. Size distributions of WSOC, inorganic ions and
    total mass were determined from the MOUDI samples. WSOC had bimodal size
    distributions with a clear accumulation mode below 1 µm of particle aerodynamic
    diameter and minor coarse mode at sizes > 1
    µm.

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