Isoprene epoxidiols (IEPOX) and their particle-phase reaction products contribute significantly to secondary organic aerosol (SOA) mass in many locations.  However, field and laboratory evidence points to gaps in our fundamental understanding of their aqueous phase chemistry and gas-particle partitioning.  We use GAMMA 5.1, a recently updated version of the McNeill group model for multiphase SOA formation, updated with recent results from our laboratory and others, to systematically investigate uncertainties in the in-particle chemistry of IEPOX and its reaction products, and the impact on predicted volatility.  In particular, we examine the formation and subsequent decomposition of oligomers and organic-inorganic adducts, and the attribution of reaction products misidentified as C<sub>5</sub>-alkenetriols in previous studies. The impact of IEPOX cloud chemistry and aerosol-cloud cycling will also be discussed.

Turning over a new leaf on IEPOX SOA formation

2019 Fall National Meeting

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