 |
| Titel |
Investigating PAH relative reactivity using congener profiles, quinone measurements and back trajectories |
| VerfasserIn |
M. S. Alam, J. M. Delgado-Saborit, C. Stark, R. M. Harrison |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 5 ; Nr. 14, no. 5 (2014-03-10), S.2467-2477 |
| Datensatznummer |
250118471
|
| Publikation (Nr.) |
 copernicus.org/acp-14-2467-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| Vapour and particle-associated concentrations of 15 polycyclic aromatic
hydrocarbons (PAH) and 11 PAH quinones have been measured in winter and
summer campaigns at the rural site, Weybourne in eastern England.
Concentrations of individual PAH are relatively smaller than average
concentrations measured previously at urban sites in the UK. The
concentrations of PAH of the air masses originating from southern England and
mainland UK are significantly larger than those from Eastern Europe and the
North Atlantic, while quinone to parent PAH ratios show an inverse behaviour,
being highest in the more aged North Atlantic polar air masses. While
concentrations of 1,2-naphthoquinone decline from winter to summer, those of
1,4-naphthoquinone and anthraquinone increase suggesting a photochemical
formation pathway. A comparison of congener concentration profiles measured
at Weybourne with those from an urban source area (Birmingham) reveals
differential losses at the rural site, especially evident in
fluoranthene : pyrene ratios and consistent with the known rates of vapour
phase reactions of 3 and 4 ring compounds with hydroxyl radical. The ratios
of quinones to their parent PAH at Weybourne are greater than those in the
urban source area indicating either more rapid loss processes for PAH, or
formation of quinones during advection of the air mass, or probably both. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|