AAAR 36th Annual Conference October 16 - October 20, 2017 Raleigh Convention Center Raleigh, North Carolina, USA
Abstract View
Aerosol Mass Production via Oxidation and Non-Reactive Gas-Particle Partitioning of Semi-Volatile Organic Compounds from Cigarette Smoke
DOUGLAS COLLINS, Chen Wang, Rachel Hems, Shouming Zhou, Jeffrey Siegel, Jonathan Abbatt, University of Toronto
Abstract Number: 205 Working Group: Indoor Aerosols
Abstract Environmental tobacco smoke has been studied for decades, but sustained aerosol organic mass (OM) due to equilibrium with semi-volatile organic compounds (SVOC) adsorbed to indoor surfaces, termed 'third-hand smoke', has seen much less attention. This study was motivated by high-resolution aerosol mass spectrometer measurements of organic aerosol in a residence during controlled cigarette smoking experiments. After a cigarette was smoked in the residence, cigarette smoke tracers in the aerosol decreased more slowly than those in the gas phase (e.g., CO, HNCO) as concentrations gradually returned to 'background' levels. This observation suggests a sustained source of organics to the aerosol, such as equilibrium partitioning of SVOC from indoor surfaces to aerosol introduced to the residence from outdoors. Controlled studies of cigarette smoke SVOC partitioning were conducted using a Teflon chamber in order to carefully constrain ventilation rates, wall surface area, and the composition of particles introduced to simulate infiltration of outdoor aerosol. Sustained aerosol OM after removal of the airborne smoke particulate matter was investigated with and without oxidant present to probe the contribution of SVOC to aerosol OM in an environment influenced by third-hand smoke. Differences between SVOC partitioning to particles introduced to the chamber under various conditions will be discussed, including a comparison of oxidant-free conditions to those involving multiple oxidants known to exist in the indoor environment.