Atmospheric Chemistry and Physics Discussions
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2010
10.5194/acpd-10-3265-2010
http://www.atmos-chem-phys-discuss.net/10/3265/2010/
http://www.atmos-chem-phys-discuss.net/10/3265/2010/acpd-10-3265-2010.html
http://www.atmos-chem-phys-discuss.net/10/3265/2010/acpd-10-3265-2010.pdf
3265
3300
2010-02-05
Chemical evolution of secondary organic aerosol from OH-initiated heterogeneous oxidation
I. J. George
igeorge@leeds.ac.uk
J. P. D. Abbatt
Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
now at: School of Chemistry, University of Leeds, Leeds, LS2 9JT, UK
The heterogeneous oxidation of laboratory Secondary Organic Aerosol
(SOA) particles by OH radicals was investigated. SOA particles,
produced by reaction of α-pinene and O<sub>3</sub>, were exposed to
OH radicals in a flow tube, and particle chemical composition, size,
and hygroscopicity were measured to assess modifications due to
oxidative aging. Aerosol Mass Spectrometer (AMS) mass spectra
indicated that the degree of oxidation of SOA particles was
significantly enhanced due to OH-initiated oxidation. Particle O/C
ratios calculated from <i>m/z</I> 44 fraction from organic mass
spectra rose by a maximum of ~0.04 units under equivalent
atmospheric aging timescales of 2 weeks assuming a 24-h average OH
concentration of 10<sup>6</sup> cm<sup>−3</sup>. Particle densities also
increased with heterogeneous oxidation, consistent with the observed
increase in the degree of oxidation. Minor reductions in particle
size, with volume losses of up to 10%, were observed due to
volatilization of oxidation products. The SOA particles became
slightly more CCN active with an increase in the κ
hygroscopicity parameter of up to a factor of two for the equivalent
of 2 weeks of OH atmospheric exposure. These results indicate that OH
heterogeneous oxidation of typical SOA proceeds sufficiently rapidly
to be an atmospherically important organic aerosol aging mechanism.
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