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| Titel |
Seasonal cycle and temperature dependence of pinene oxidation products, dicarboxylic acids and nitrophenols in fine and coarse air particulate matter |
| VerfasserIn |
Y. Y. Zhang, L. Müller, R. Winterhalter, G. K. Moortgat, T. Hoffmann, U. Pöschl |
| 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 ; 10, no. 16 ; Nr. 10, no. 16 (2010-08-25), S.7859-7873 |
| Datensatznummer |
250008725
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| Publikation (Nr.) |
 copernicus.org/acp-10-7859-2010.pdf |
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| Zusammenfassung |
| Filter samples of fine and coarse air particulate matter (PM) collected over
a period of one year in central Europe (Mainz, Germany) were analyzed for
water-soluble organic compounds (WSOCs), including the α- and β-pinene oxidation products pinic acid, pinonic acid and
3-methyl-1,2,3-butanetricarboxylic acid (3-MBTCA), as well as a variety of
dicarboxylic acids and nitrophenols. Seasonal variations and other
characteristic features in fine, coarse, and total PM (TSP) are discussed
with regard to aerosol sources and sinks in comparison to data from other
studies and regions. The ratios of adipic acid and phthalic acid to azelaic
acid indicate that the investigated aerosol samples were mainly influenced
by biogenic sources. A strong Arrhenius-type correlation was found between
the 3-MBTCA concentration and inverse temperature (R2 = 0.79, n = 52,
Ea = 126 ± 10 kJ mol−1, temperature range 275–300 K). Model
calculations suggest that the temperature dependence observed for 3-MBTCA
can be explained by enhanced photochemical production due to an increase of
hydroxyl radical (OH) concentration with increasing temperature, whereas the
influence of gas-particle partitioning appears to play a minor role. The
results indicate that the OH-initiated oxidation of pinonic acid is the
rate-limiting step in the formation of 3-MBTCA, and that 3-MBTCA may be a
suitable tracer for the chemical aging of biogenic secondary organic aerosol
(SOA) by OH radicals. An Arrhenius-type temperature dependence was also
observed for the concentration of pinic acid (R2 = 0.60, n = 56,
Ea = 84 ± 9 kJ mol−1); it can be tentatively explained by the
temperature dependence of biogenic pinene emission as the rate-limiting step
of pinic acid formation. |
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