AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Surface Extractor for Deposited Indoor Aerosol
HANNAH PRZELOMSKI, Rachel O'Brien, College of William and Mary
Abstract Number: 487 Working Group: The Air We Breathe: Indoor Aerosol Sources and Chemistry
Abstract Organic aerosol particles can deposit onto indoor surfaces and, once on the surface, the particles can continue to interact with the gas-phase above. Additionally, these dry deposited particles will undergo aging processes similar to processes encountered for atmospheric aerosols due to the longer timeframes for exchange indoors. These include heterogeneous oxidation, photolysis, hydration, oligomerization etc. The composition of this material is not well characterized for exposure in different indoor environments or to the different types of aging processes. A better understanding of this material is needed, including where it comes from (in terms of indoor aerosol sources) as well as how the composition varies with time. Here, a surface extractor has been designed to enable the solvent extraction of these complex mixtures off impermeable surfaces. Both aqueous and organic solvents can be used and the extractor enables good control over the solvent volume and surface area extracted. A variety of methods can be used to investigate these samples including offline-aerosol mass spectrometry as well as GC/MS and ATR-FTIR. These samples provide a complementary data set to wipe samples for indoor surfaces and enable a more complete picture of the composition and transport of indoor aerosol particles.