Secondary organic aerosol formation from the photooxidation of p- and o-xylene.
The formation of secondary organic aerosol (SOA) from the photooxidation of xylene isomers (m-, p-, and o-xylenes) has been extensively investigated. The dependence of SOA aerosol formation on the structure of xylene isomers in the presence of NO was confirmed. Generally, SOA formation of p-xylene was less than that of m- and o-xylenes. This discrepancy varies significantly with initial NOx levels. In a NOx-free environment, the difference of aerosol formation between o- and p-xylenes becomes insignificant. Several chemical pathways for the SOA dependence on structure and NOx are explored, with the experimental findings indicating that organic peroxides may be a major key to explaining SOA formation from aromatic hydrocarbons.
Bourns College of Engineering--Center for Environmental Research and Technology, University of California, Riverside, California 92521, USA.
Chen
C
Song
Kwangsam
K
Na
Bethany
B
Warren
Quentin
Q
Malloy
David R
DR
Cocker
D000336:Aerosols; D000393:Air Pollutants / Q000737:chemistry / Q000528:radiation effects; D009589:Nitrogen Oxides / Q000737:chemistry*; D010084:Oxidation-Reduction; D010545:Peroxides / Q000737:chemistry*; D010777:Photochemistry; D014992:Xylenes / Q000737:chemistry* / Q000528:radiation effects*
D000336:Aerosols; D000393:Air Pollutants; D009589:Nitrogen Oxides; D010545:Peroxides; D014992:Xylenes; C031286:4-xylene; C026114:2-xylene