Secondary Organic Aerosol (SOA) formation from the NO3 radical-initiated oxidation of monoterpenes is studied using chamber and flow-tube experiments at the Reed Environmental Chamber (REC) and the University of California, Irvine (UCI). The NO3 radical plays an important role in the production of SOA and organonitrates from monoterpenes, however, differences in yields between monoterpenes are still poorly understood. SOA and organonitrate yields from α-pinene are typically low compared to the relatively high yields from other monoterpenes such as 3-carene, which is attributed to differentially preferred reaction pathways. Chamber studies at REC have observed substantial pinonaldehyde formation and low SOA yield from α-pinene + NO3. α-Thujene, the only naturally-occurring monoterpene with the secondary ring in the same position relative to the double bond as α-pinene, has also displayed a low SOA yield when oxidized by NO3, demonstrating the importance of the secondary ring position in relation to SOA yield. Additional studies to be carried out at REC and UCI will further analyze oxidation products using thermal desorption chemical ionization mass spectroscopy for particle-phase measurements, time-of-flight mass spectroscopy for gas-phase measurements, and thermal dissociation cavity ring-down spectroscopy for bulk organonitrate concentrations in both phases.

Comparative laboratory studies of NO3 radical-initiated oxidation of monoterpenes

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.