AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
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Physicochemical Properties and Toxicity of Fine Particles Produced from Pulverized Coal Combustion
HUNGSOO JOO, Tsatsral Batmunkh, JiYi Lee, KwangYul Lee, Lucille Joanna Borlaza, Kihong Park, Gwangju Institute of Science and Technology
Abstract Number: 259 Working Group: Combustion
Abstract The aims of this study are 1) to characterize physical and chemical properties of particles produced from laboratory scale-coal combustion system; 2) to evaluate toxicity of the particles by using direct (air-liquid interface) and indirect (submerged) exposure systems to cells; and 3) to measure oxidative potential (OP) of the collected PM on filter. A bench scale high temperature (up to 1200°C) drop-tube furnace (Lindberg/Blue M, Model HTF55342C, Thermo Electron Corp., USA) with a quartz tube was used to generate coal combustion particles. Bituminous coals from a coal power plant (Korea South Power Co. Ltd., Hadong, Korea) were pulverized and subjected to sieving using a 200 mesh (less than 75µm) before use. Coal combustion particles were generated at various burning temperature conditions ranging from 550 to 1100°C. Coal combustion particles were collected on filters using PM2.5 cyclone. These samples were subjected to biological response (cell viability, genotoxicity, and oxidative stress) and chemical response (oxidative potential by dithiothreitol and electron spin resonance assay). Particle size distribution, PM2.5 mass concentration, black carbon (BC) concentration, and chemical components of non-refractory submicrometer particles were measured with a scanning mobility particle sizer (SMPS) (DMA 3088 and CPC 3022, TSI, USA), Dust Trak DRX (TSI, USA), Aethalometer (Aethlabs, USA), and aerosol mass spectrometer (AMS)(Aerodyne Inc., USA). Cultex® RFS compact module (Cultex Laboratories GmbH, Germany) was used for the air-liquid interface exposure system. It was observed that burning temperature conditions significantly affected size distribution, emission factor, chemical properties (ions, metals, organic carbon (OC), elemental carbon (EC), and OC speciation), oxidative potentials, and biological response of coal burning particles.