Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
7
14
2007
10.5194/acp-7-3909-2007
http://www.atmos-chem-phys.net/7/3909/2007/
http://www.atmos-chem-phys.net/7/3909/2007/acp-7-3909-2007.html
http://www.atmos-chem-phys.net/7/3909/2007/acp-7-3909-2007.pdf
3909
3922
2007-07-24
Secondary organic aerosol formation from <i>m</i>-xylene, toluene, and benzene
N. L. Ng
J. H. Kroll
A. W. H. Chan
P. S. Chhabra
R. C. Flagan
J. H. Seinfeld
seinfeld@caltech.edu
Departments of Chemical Engineering and Environmental Science and Engineering, California Institute of Technology, Pasadena, CA 91125, USA
now at: Aerodyne Research, Inc. 45 Manning Road, Billerica, MA 01821, USA
Secondary organic aerosol (SOA) formation from the photooxidation of
<i>m</i>-xylene, toluene, and benzene is investigated in the Caltech environmental
chambers. Experiments are performed under two limiting NO<sub>x</sub> conditions;
under high-NO<sub>x</sub> conditions the peroxy radicals (RO<sub>2</sub>) react only
with NO, while under low-NO<sub>x</sub> conditions they react only with HO<sub>2</sub>.
For all three aromatics studied (<i>m</i>-xylene, toluene, and benzene), the SOA
yields (defined as the ratio of the mass of organic aerosol formed to the
mass of parent hydrocarbon reacted) under low-NO<sub>x</sub> conditions
substantially exceed those under high-NO<sub>x</sub> conditions, suggesting the
importance of peroxy radical chemistry in SOA formation. Under low-NO<sub>x</sub>
conditions, the SOA yields for <i>m</i>-xylene, toluene, and benzene are constant
(36%, 30%, and 37%, respectively), indicating that the SOA formed
is effectively nonvolatile under the range of <i>M<sub>o</sub></i>(>10 μg m<sup>−3</sup>) studied. Under high-NO<sub>x</sub> conditions, aerosol growth
occurs essentially immediately, even when NO concentration is high. The SOA
yield curves exhibit behavior similar to that observed by Odum et al. (1996,
1997a, b), although the values are somewhat higher than in the earlier study.
The yields measured under high-NO<sub>x</sub> conditions are higher than previous
measurements, suggesting a "rate effect" in SOA formation, in which SOA
yields are higher when the oxidation rate is faster. Experiments carried out
in the presence of acidic seed aerosol reveal no change of SOA yields from
the aromatics as compared with those using neutral seed aerosol.
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