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| Titel |
Source apportionment of elevated wintertime PAHs by compound-specific radiocarbon analysis |
| VerfasserIn |
R. J. Sheesley, M. Kruså, P. Krecl, C. Johansson, Ö. Gustafsson |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 9, no. 10 ; Nr. 9, no. 10 (2009-05-25), S.3347-3356 |
| Datensatznummer |
250007305
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| Publikation (Nr.) |
 copernicus.org/acp-9-3347-2009.pdf |
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| Zusammenfassung |
| 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 Δ14C for PAHs
spanned from −138.3‰ to 58.0‰. A simple isotopic mass balance model was
applied to estimate the fraction biomass (fbiomass) contribution, which
was constrained to 71–87% for the individual PAHs. Indeno[cd]pyrene plus
benzo[ghi]perylene had an fbiomass of 71%, while fluoranthene and
phenanthrene (gas phase) had the highest biomass contribution at 87%. The
total organic carbon (TOC, defined as carbon remaining after removal of
inorganic carbon) fbiomass was estimated to be 77%, which falls
within the range for PAHs. This CSRA data of atmospheric PAHs established
that RWC is the dominating source of atmospheric PAHs to this region of the
boreal zone with some variations among RWC contributions to specific PAHs. |
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