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| Titel |
Second-generation products contribute substantially to the particle-phase organic material produced by β-caryophyllene ozonolysis |
| VerfasserIn |
Y. J. Li, Q. Chen, M. I. Guzmán, C. K. Chan, S. T. Martin |
| 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 ; 11, no. 1 ; Nr. 11, no. 1 (2011-01-06), S.121-132 |
| Datensatznummer |
250009060
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| Publikation (Nr.) |
 copernicus.org/acp-11-121-2011.pdf |
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| Zusammenfassung |
| The production of secondary organic aerosol (SOA) by the dark ozonolysis of
gas-phase β-caryophyllene was studied. The experiments were conducted
in a continuous-flow environmental chamber for organic particle mass
concentrations of 0.5 to 30 μg m−3 and with ozone in excess,
thereby allowing the study of second-generation particle-phase products
under atmospherically relevant conditions. The particle-phase products were
characterized by an ultra-performance liquid chromatograph equipped with an
electrospray ionization time-of-flight mass spectrometer (UPLC-ESI-ToF-MS).
Fragmentation mass spectra were used for the structural elucidation of each
product, and the structures were confirmed as consistent with the
accurate m/z values of the parent ions. In total, fifteen products were
identified. Of these, three are reported for the first time. The structures
showed that 9 out of 15 particle-phase products were second generation,
including all three of the new products. The relative abundance of the
second-generation products was approximately 90% by mass among the 15
observed products. The O:C and H:C elemental ratios of the 15 products ranged
from 0.13 to 0.50 and from 1.43 to 1.60, respectively. Fourteen of
the products contained 3 to 5 oxygen atoms. A singular product, which was one
of the three newly identified ones, had 7 oxygen atoms, including 1
carboxylic group, 2 carbonyl groups, and 3 hydroxyl groups. It was
identified as 2, 3-dihydroxy-4-[2-(4-hydroxy-3-oxobutyl)-3, 3-dimethylcyclobutyl]-4-oxobutanoic
acid (C14H22O7). The estimated saturation vapor pressure
of this product is 3.3×10−13 Pa, making this product a
candidate contributor to new particle formation in the atmosphere. |
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