EXAMINATION OF EARLY-STAGE CHEMISTRY OF SECONDARY ORGANIC AEROSOL FORMATION USING A FLOW CELL

 

Alicia J. Kalafut-Pettibone, William Sean McGivern

 

A laminar flow cell for the study of reactions of volatile organic compounds (VOC) that lead to secondary organic aerosol (SOA) formation has been constructed.  In the cell, reactions of VOCs with oxygen are initiated by the ultraviolet photolysis of alkyl halides to form radical species typical of those produced from atmospheric hydrogen abstraction.  Under these experimental conditions, early-stage formation processes dominate, and subsequent oxidative aging is not considered.  The condensed-phase oxidation products are chemically characterized using derivatization techniques and LC-UV and LC-MS/MS analysis to elucidate functional groups and mechanistic production pathways.