 |
| Titel |
Effect of chemical structure on secondary organic aerosol formation from C12 alkanes |
| VerfasserIn |
L. D. Yee, J. S. Craven, C. L. Loza, K. A. Schilling, N. L. Ng, M. R. Canagaratna, P. J. Ziemann, R. C. Flagan, J. H. Seinfeld |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 21 ; Nr. 13, no. 21 (2013-11-15), S.11121-11140 |
| Datensatznummer |
250085814
|
| Publikation (Nr.) |
 copernicus.org/acp-13-11121-2013.pdf |
|
|
|
|
|
| Zusammenfassung |
| The secondary organic aerosol (SOA) formation from four C12 alkanes (n-dodecane,
2-methylundecane, hexylcyclohexane, and cyclododecane) is studied in the
Caltech Environmental Chamber under low-NOx conditions, in which
the principal fate of the peroxy radical formed in the initial OH reaction is
reaction with HO2. Simultaneous gas- and particle-phase measurements
elucidate the effect of alkane structure on the chemical mechanisms
underlying SOA growth. Reaction of branched structures leads to fragmentation
and more volatile products, while cyclic structures are subject to faster
oxidation and lead to less volatile products. Product identifications reveal
that particle-phase reactions involving peroxyhemiacetal formation from
several multifunctional hydroperoxide species are key components of initial
SOA growth in all four systems. The continued chemical evolution of the
particle-phase is structure-dependent, with 2-methylundecane SOA formation
exhibiting the least extent of chemical processing and cyclododecane SOA
achieving sustained growth with the greatest variety of chemical pathways.
The extent of chemical development is not necessarily reflected in the oxygen
to carbon (O : C) ratio of the aerosol as cyclododecane achieves the lowest
O : C, just above 0.2, by the end of the experiment and hexylcyclohexane the
highest, approaching 0.35. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|