|
|||||
|
|
Particle-size distribution of PAH in the air of a remote Norway spruce forest in northern Bavaria |
|
| Authors: | Schönbuchner Heiko Guggenberger Georg Peters Klaus Bergmann Hans Zech Wolfgang |
| Institution: | 1.Institute of Soil Science and Soil Geography, University of Bayreuth, D-95440, Bayreuth, Germany ;2.Institute for Nutrition, Friedrich-von-Schiller University Jena, Dornburgerstra?e 25, D-07743, Jena, Germany ;4.Department of Meteorology, University of Bayreuth, D-95440, Bayreuth, Germany ; |
| Abstract: | The aim of the present study was to elucidate thedistribution of particulate polycyclic aromatichydrocarbons (PAH) in the air of a remote Norwayspruce (Picea abies (L.) karst.) stand.The study encompassed a total of twenty differentcongeners. Particles in ambient air were alternativelycollected by two different Berner cascade impactors atthe field site in Northern Bavaria over a 14-weeksperiod from the end of April through to the end ofJuly 1994 and subsequently analyzed for their PAHcontent. The concentrations of total suspendedparticulate matter (TSP) ranged from 9–31 μg m-3,suggesting that the field site is an area with a lowlevel of airborne particles. There was a negativerelationship of total particle concentrations with theamount of canopy precipitation due to particle washout at precipitation events. The distribution of theparticle masses on the different size fractions witha maximum in the 1-μm range is typical for remoteareas and indicates a medium-range transport. Theaerosol-bound PAH load decreased from spring sampleswith 2–4 ng m-3 to values <1 ng m-3 in the summersamples. Concurrently, the proportion of low molecularweight congeners in the total PAH load declined.Frequently, the highest PAH concentrations (referringto the air) were found in the 0.1–3 μm sizeseparates (accumulation mode). The results suggestthat apart from PAH input to the soil with litter, dryand wet deposition of aerosol particles is animportant pathway of PAH contamination of acid forestsoils in the Fichtelgebirge mountain range. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |