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| Titel |
Secondary organic aerosol production from modern diesel engine emissions |
| VerfasserIn |
S. Samy, B. Zielinska |
| 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. 2 ; Nr. 10, no. 2 (2010-01-22), S.609-625 |
| Datensatznummer |
250007965
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| Publikation (Nr.) |
 copernicus.org/acp-10-609-2010.pdf |
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| Zusammenfassung |
| Secondary organic aerosol (SOA) production was observed at significant
levels in a series of modern diesel exhaust (DE) aging experiments conducted
at the European Outdoor Photoreactor/Simulation Chamber (EUPHORE). The
greatest production occurred in DE with toluene addition experiments
(>40%), followed by DE with HCHO (for OH radical generation)
experiments. A small amount of SOA (3%) was observed for DE in dark with
N2O5 (for NO3 radical production) experiments. The analysis
for a limited number (54) of polar organic compounds (POC) was conducted to
assess the composition of modern DE and the formation of photochemical
transformation products. Distinct POC formation in light versus dark
experiments suggests the role of OH initiated reactions in these chamber
atmospheres. A trend of increasing concentrations of dicarboxylic acids in
light versus dark experiments was observed when evaluated on a compound
group basis. The four toluene addition experiments in this study were
performed at different [tol]o/[NOx]o ratios and displayed an
average SOA %yield (in relation to toluene) of 5.3±1.6%, which is
compared to past chamber studies that evaluated the impact of
[tol]o/[NOx]o on SOA production in more simplified mixtures. |
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