 |
| Titel |
Elemental analysis of chamber organic aerosol using an aerodyne high-resolution aerosol mass spectrometer |
| VerfasserIn |
P. S. Chhabra, R. C. Flagan, J. H. Seinfeld |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 9 ; Nr. 10, no. 9 (2010-05-03), S.4111-4131 |
| Datensatznummer |
250008418
|
| Publikation (Nr.) |
 copernicus.org/acp-10-4111-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| The elemental composition of laboratory chamber secondary organic
aerosol (SOA) from glyoxal uptake, α-pinene ozonolysis,
isoprene photooxidation, single-ring aromatic photooxidation, and
naphthalene photooxidation is evaluated using Aerodyne high-resolution
time-of-flight mass spectrometer data. SOA O/C ratios range from
1.13 for glyoxal uptake experiments to 0.30–0.43 for α-pinene ozonolysis. The
elemental composition of α-pinene and naphthalene SOA is also
confirmed by offline mass spectrometry. The fraction of organic
signal at m/z 44 is generally a good measure of SOA
oxygenation for α-pinene/O3, isoprene/high-NOx,
and naphthalene SOA systems. The agreement between measured and
estimated O/C ratios tends to get closer as the fraction of
organic signal at m/z 44 increases. This is in contrast
to the glyoxal uptake system, in which m/z 44
substantially underpredicts O/C. Although chamber SOA
has generally been considered less oxygenated than ambient SOA,
single-ring aromatic- and naphthalene-derived SOA can reach O/C
ratios upward of 0.7, well within the range of ambient PMF component OOA, though still not
as high as some ambient measurements. The spectra of aromatic and
isoprene-high-NOx SOA resemble that of OOA, but the spectrum of
glyoxal uptake does not resemble that of any ambient organic aerosol PMF component. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|