Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-9-10015-2009
http://www.atmos-chem-phys-discuss.net/9/10015/2009/
http://www.atmos-chem-phys-discuss.net/9/10015/2009/acpd-9-10015-2009.html
http://www.atmos-chem-phys-discuss.net/9/10015/2009/acpd-9-10015-2009.pdf
10015
10054
2009-04-20
The formation of secondary organic aerosol from the isoprene + OH reaction in the absence of NO<sub>x</sub>
T. E. Kleindienst
kleindienst.tad@epa.gov
M. Lewandowski
J. H. Offenberg
M. Jaoui
E. O. Edney
National Exposure Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA
Alion Science and Technology, Box 12313, Research Triangle Park, NC 27709, USA
The reaction of isoprene (C<sub>5</sub>H<sub>8</sub>) with hydroxyl radicals has been
studied in the absence of nitrogen oxides (NO<sub>x</sub>) to determine
physical and chemical characteristics of the secondary organic aerosol
formed. Experiments were conducted using a smog chamber operated in a
steady-state mode permitting measurements of moderately low aerosol levels.
GC-MS analysis was conducted to measure methyl butenediols in the gas phase
and polyols in the aerosol phase. Analyses were made to obtain several bulk
aerosol parameters from the reaction including values for the organic mass to
organic carbon ratio, the effective enthalpy of vaporization
(ΔH<sub>vap</sub><sup>eff</sup>), the organic peroxide fraction, and the
aerosol yield.
<br>
The gas phase analysis showed the presence of methacrolein, methyl vinyl
ketone, and four isomers of the methyl butenediols. These gas-phase compounds
may serve as precursors for one or more of several compounds detected in the
aerosol phase including 2-methylglyceric acid, three 2-methyl alkenetriols,
and two 2-methyl tetrols. In contrast to most previous studies, the 2-methyl
tetrols (and the 2-methyl alkenetriols) were found to form in the absence of
acidic sulfate aerosol. A re-evaluation of field samples in Research Triangle
Park, North Carolina, during the summers of 2000 and 2001 indicated in the
presence of the methyl butenediols from gas-phase denuder samples taken at
the time.
<br>
SOA/SOC (i.e., OM/OC) was found to average 1.9 in the absence of NO<sub>x</sub>. The effective enthalpy of vaporization was measured as
38.6 kJ mol<sup>−1</sup>, consistent with values that have previously been used
in modeling studies. The yields in this work (using an independent
technique than that previous) are lower than those of Kroll et al. (2006) for
similar aerosol masses. SOC yields reported in this work range from
0.5–1.4% for carbon masses between 17 and 49 μgC m<sup>−3</sup>.
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