Chemical Composition of Secondary Organic Aerosol Produced from the Oxidation of Representative Volatile Chemical Products

LU XU, Matthew Coggon, Chelsea Stockwell, Carsten Warneke, Allison Piasecki, Ann M. Middlebrook, Abraham Dearden, Shantanu Jathar, Cort Zang, Tucker Melles, Megan Willis, Katelyn Rediger, Delphine K. Farmer, CU CIRES - NOAA ESRL

     Abstract Number: 63
     Working Group: Aerosol Sources and Constituents of Emerging Importance and Their Impacts across Spatial Scales

Abstract
Volatile chemical products (VCPs) are emerging pollutants that have critical implications on ozone and particulate matter pollutions. However, a quantitative understanding of the contribution of VCPs to ambient particulate matter is lacking, because of uncertainties in the yield and chemical composition of organic aerosol produced from the oxidation of VCPs. In this study, we performed laboratory experiments using the chamber facility at Colorado State University to investigate the oxidation mechanisms, yields of secondary organic aerosol, and chemical composition of several representative VCPs. To simultaneously characterize both gas and particle compositions, a suite of state-of-the-art instruments was deployed, including PTR-MS, FIGAERO I- CIMS, AMS, EESI-MS and two NH4+ CIMS, one of which is coupled with an evaporative aerosol inlet to measure real-time particle composition. This presentation will focus on the gas/particle partitioning characterized by the two NH4+ CIMS and the comparison of particle composition measured by NH4+ CIMS and FIGAERO I- CIMS.