Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 10 2009 10.5194/acp-9-3347-2009 http://www.atmos-chem-phys.net/9/3347/2009/ http://www.atmos-chem-phys.net/9/3347/2009/acp-9-3347-2009.html http://www.atmos-chem-phys.net/9/3347/2009/acp-9-3347-2009.pdf 3347 3356 2009-05-25 Source apportionment of elevated wintertime PAHs by compound-specific radiocarbon analysis R. J. Sheesley M. Krus&aring; P. Krecl C. Johansson Ö. Gustafsson orjan.gustafsson@itm.su.se Department of Applied Environmental Science (ITM), Stockholm University, 10691 Stockholm, Sweden Natural abundance radiocarbon analysis facilitates distinct source apportionment between contemporary biomass/biofuel (¹⁴C "alive") versus fossil fuel (¹⁴C "dead") combustion. Here, the first compound-specific radiocarbon analysis (CSRA) of atmospheric polycyclic aromatic hydrocarbons (PAHs) was demonstrated for a set of samples collected in Lycksele, Sweden a small town with frequent episodes of severe atmospheric pollution in the winter. Renewed interest in using residential wood combustion (RWC) means that this type of seasonal pollution is of increasing concern in many areas. Five individual/paired PAH isolates from three pooled fortnight-long filter collections were analyzed by CSRA: phenanthrene, fluoranthene, pyrene, benzo[b+k]fluoranthene and indeno[cd]pyrene plus benzo[ghi]perylene; phenanthrene was the only compound also analyzed in the gas phase. The measured &Delta;¹⁴C for PAHs spanned from &minus;138.3&permil; to 58.0&permil;. A simple isotopic mass balance model was applied to estimate the fraction biomass (<I>f</I>_biomass) contribution, which was constrained to 71–87% for the individual PAHs. 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