کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4439554 | 1311024 | 2011 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Wet deposition and scavenging efficiency of gaseous and particulate phase polycyclic aromatic compounds at a central European suburban site Wet deposition and scavenging efficiency of gaseous and particulate phase polycyclic aromatic compounds at a central European suburban site](/preview/png/4439554.png)
The concentration of 15 3–6-ring polycyclic aromatic hydrocarbons (PAHs) in atmospheric precipitation was monitored over 18 months in the years 2006–2008, using an automatic wet-only sampler at a suburban site in Brno, Czech Republic. The PAH concentration in rainwater varied between 2.8 and 571 ng L−1 and the volume weighted mean was 93 ng L−1 with fluoranthene, pyrene, phenanthrene and benzo(b)fluoranthene contributing most. The contribution of particle-associated PAH (sum of 15) to the wet deposition flux was by average 51%, 82% in summer and 47% in winter. The median total (gas and particulate) scavenging ratios, Wt (m3 L−1), varied between 450 for acenaphthene and 3.1 × 104 for fluoranthene. Estimates of the scavenged fraction in the column of air subject to precipitation suggest that typically only a few percent or less of the airborne PAHs are washed out during a precipitation event. The contribution of particle scavenging to total PAH scavenging varied between 7 and 98% among events. Its median was 41%. Scavenging efficiency seems to be influenced by mass size distribution. It is concluded that wet deposition of PAHs is less efficient than dry deposition.
► The PAH concentration in rainwater was determined at a suburban site during all seasons.
► Particle-associated and dissolved PAH contributed equal amounts to the wet deposition.
► The scavenged fraction was estimated by sampling air before rain.
► Only a few percent or less of the airborne PAHs are washed out during a precipitation event.
► Wet deposition of PAHs is less efficient than dry deposition.
Journal: Atmospheric Environment - Volume 45, Issue 25, August 2011, Pages 4305–4312