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Journal of Atmospheric Chemistry

, Volume 47, Issue 3, pp 223–241 | Cite as

Particle Size Distribution and Gas-Particle Partition of Polycyclic Aromatic Hydrocarbons in Helsinki Urban Area

  • Masahiko Shimmo
  • Karri Saarnio
  • Pasi Aalto
  • Kari Hartonen
  • Tuulia Hyötyläinen
  • Markku Kulmala
  • Marja-Liisa Riekkola
Article

Abstract

Ambient concentrations of polycyclic aromatic hydrocarbons (PAHs) were measured in Helsinki (Finland). Particle mass size distributions were obtained with a cascade impactor (12 stages) with glass fibre filters as substrates. Simultaneously with the impactor measurements, particulate and gaseous PAHs were collected on a quartz filter and XAD-2 adsorbent, respectively, for evaluation of gas-partition coefficients. Samples were analysed for PAHs by on-line coupled supercritical fluid extraction — liquid chromatography — gas chromatography — mass spectrometry. The impactor results showed that most of the PAHs in Helsinki urban area were concentrated in fine particles (<2.5 μm diameter) with unimode peak at about 1 μm. The results were comparable with the number distribution measured with a differential mobility particle sizer. Total amounts of PAHs (gas + particle) varied from 15 (acenaphthylene) to 1990 (fluorene) pg/m3. The PAHs lighter than 202 amu (pyrene and fluoranthene) were exclusively in gas phase, whereas those heavier than 202 amu were mostly associated with particles. A plot of the partition coefficients (logKp) versus the temperature dependent sub-cooled vapour pressures (logp L 0 ) showed a gradient of −0.66, which deviated from equilibrium state (gradient = −1).

polycyclic aromatic hydrocarbons cascade impactor size distribution supercritical fluid extraction liquid chromatography — gas chromatography 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Masahiko Shimmo
    • 1
  • Karri Saarnio
    • 1
  • Pasi Aalto
    • 2
  • Kari Hartonen
    • 1
  • Tuulia Hyötyläinen
    • 1
  • Markku Kulmala
    • 2
  • Marja-Liisa Riekkola
    • 1
  1. 1.Laboratory of Analytical Chemistry, Department of ChemistryUniversity of HelsinkiFinland
  2. 2.Division of Atmospheric Sciences, Department of Physical SciencesUniversity of HelsinkiFinland

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