Multi-Phase Product Distribution of Cl-Initiated VOC Oxidation

HANNAH KENAGY, Lesly Franco Deloya, Jesse Kroll, Massachusetts Institute of Technology

     Abstract Number: 496
     Working Group: Aerosol Chemistry

Abstract
Chlorine-radical-initiated chemistry is important in marine, wintertime, and Arctic environments. However, key uncertainties still exist, particularly regarding the full product distribution of Cl-initiated oxidation of volatile organic compounds (VOCs) and the ultimate fate of chlorine in these processes under varied environmental conditions. Previous laboratory studies suggest that Cl-initiated oxidation of VOCs produces oxygenated VOCs and organochlorides, some of which partition to the particle phase as secondary organic aerosol (SOA). Here we perform a series of laboratory experiments to explore the full product distribution of Cl-initiated oxidation from a range of VOCs under a range of reaction conditions. Products in both the gas and particle phases are measured using chemical ionization mass spectrometry and aerosol mass spectrometry. Measurements of the multi-phase product distribution accessible through these techniques allow for an improved understanding of the chemical mechanisms and phase-partitioning involved in Cl-initiated VOC oxidation, thereby improving our ability to model VOC oxidation and SOA formation under conditions in which tropospheric halogen chemistry is important.