Atmospheric aerosol particles contribute significantly to poor air quality and climate change. However, uncertainties about their formation and chemical properties pose significant challenges to atmospheric modelers. Much of this uncertainty comes from the organic aerosol (OA) fraction: either primary (POA, emitted directly) or secondary (SOA, formed from atmospheric reactions of volatile organic compounds). SOA is often the dominant fraction of atmospheric aerosol, yet is among the least-understood forms of aerosol. There are numerous possible oxidative pathways and each molecule can react with multiple OH radicals, further impeding modeling. Oxidation by the OH radical generally proceeds by H-abstraction, yielding an alkyl radical which couples with O<sub>2</sub>, generating an alkylperoxy radical, and finally reaction with NO to form an alkoxy radical. The alkoxy radical can then undergo a 1,5 H-abstraction and increase in oxidation state to form lower-volatility products that produce more SOA, or fragment into smaller more volatile products that remain gaseous. Since there are thousands of potential compounds to model in an urban atmosphere, classifying compounds according to similar characteristics can ease this burden. To do this requires further understanding of how the identity of the precursor species influences the reaction chemistry, yields, and kinetics. Here, we take a structural approach to determine how varying the identity of a single functional group influences the oxidative reaction pathways, especially with regards to the key fragmentation or abstraction step, and resulting properties of the products of different C<sub>10</sub>molecules: alkane, alcohol, aldehyde, and ketone. SOA was generated from each precursor in a Teflon smog chamber and our results are discussed in the context of aerosol yields. This data will further understanding of the importance of functional group on SOA yields and kinetics of oxidation and improve modeling of SOA growth for use in climate and air quality models.

Impact of single-oxygen functional groups on secondary organic aerosol yields and chemistry

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.