Polycyclic aromatic hydrocarbons on small spatial and temporal scales 2 Mass size distributions and gas-particle partitioning

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Title in English Polycyclic aromatic hydrocarbons on small spatial and temporal scales 2 Mass size distributions and gas particle partitioning
Authors

LAMMEL Gerhard KLÁNOVÁ Jana ILIC Predrag KOHOUTEK Jiří GASIC Bojan KOVACIC Igor ŠKRDLÍKOVÁ Lenka

Year of publication 2010
Type Article in Periodical
Magazine / Source Atmospheric Environment
MU Faculty or unit

Faculty of Science

Citation
Web http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VH3-50X2NP1-1&_user=42941&_coverDate=12%2F31%2F2010&_rdoc=22&_fmt=high&_orig=browse&_origin=browse&_zone=rslt_list_item&_srch=doc-info%28%23toc%236055%232010%23999559961%232534781%23FLA%23display
Field Air pollution and control
Keywords Polycyclic aromatic hydrocarbons; Gas-particle partitioning; Urban aerosol; Spatial variability
Description PAHs were measured together with inorganic air pollutants at two urban sites and one rural site in the Banja Luka area, Bosnia and Hercegovina, during 72 h in July 2008 using a high time resolution (5 samples per day) with the aim to study gas-particle partitioning, aerosol mass size distributions and to explore the potential of a higher time resolution (4 h-sampling). In the particulate phase the mass median diameters of the PAHs were found almost exclusively in the accumulation mode (0.1 to 1.0 um of size). These were larger for semivolatile PAHs than for nonvolatile PAHs. Gas particle partitioning of semivolatile PAHs was strongly influenced by temperature. The results suggest that the JungePankow model is inadequate to explain the interspecies variation and another process must be significant for phase partitioning - less temperature sensitive than adsorption. Care should be taken when interpreting slopes "m" of the type log Kp = m log pL0 plus b based on 24 h means, as these are found sensitive to the time averaging, i.e. tend to be higher than 12 h mean samples.
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