Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 49, Issue 9, Pages 5407-5416Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.5b00442
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Funding
- French Agency for Environment and Energy Management (ADEME)
- French National Research Agency (ANR) [(ANR-10-1ABX-45]
- NSF MRI [CBET9022643]
- [NSF AGS1136479]
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1136479] Funding Source: National Science Foundation
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Aging processes of secondary organic aerosol (SOA) may be a source of oxygenated organic aerosols; however, the chemical processes involved remain unclear. In this study, we investigate photochemical aging of SOA produced by the gas-phase oxidation of naphthalene by hydroxyl radicals and acenaphthylene by ozone. We monitored the SOA composition using a high-resolution time-of-flight aerosol mass spectrometer. We initiated SOA aging with UV photolysis alone and with OH radicals in the presence or absence of light and at different NOx levels. For naphthalene, the organic composition of the particulate phase seems to be dominated by highly oxidized compounds such as carboxylic acids, and aging data may be consistent with diffusion limitations. For acenaphthylene, the fate of oxidized products and the moderately oxidized aerosol seem to indicate that functionalization reactions might be the main aging process were initiated by the cumulative effect of light and OH radicals.
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