10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Semi-Volatile Organic Compounds in Fresh and Laboratory-Aged Biomass Burning Aerosols
DEEP SENGUPTA, Vera Samburova, Chiranjivi Bhattarai, Michealene Iaukea-Lum, Adam Watts, Hans Moosmuller, Andrey Khlystov, Desert Research Institute
Abstract Number: 1473 Working Group: Combustion-Generated Aerosols: the Desirable and Undesirable
Abstract Semi-volatile organic compounds (SVOCs) in fresh and atmospherically-aged biomass-burning aerosols can adversely affect human health and modify radiative forcing of climate. In the present study, we have selected representative fuels (both globally and regionally important) that have characteristics of both flaming and smoldering combustions and burned them under controlled conditions using DRI's combustion chamber facility. Gas and particulate phase emissions from the selected fuels were aged (5-7 days equivalent of atmospheric aging) using an oxidative flow reactor (OFR, Aerodyne PAM). Fresh and OFR-aged biomass-burning aerosols were collected on TIGF filters followed by XAD-4 resin cartridges and extracted with dichloromethane followed by acetone. The extracts were then analyzed for more than 200 compounds (e.g. n-alkanes, polycyclic aromatic hydrocarbons (PAHs), and polar organic compounds) using gas chromatography mass spectrometry technique (GC/MS). Relative abundance of n-alkanes, PAHs, and polar compounds, such as mono- and di-carboxylic acids, and methoxylated phenols, are useful for identifying source profiles of tested fuels. We will present source profiles of combustion emissions generated using individual fuels and discuss how atmospheric aging affects chemical composition of these emissions.