AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
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Characteristics of Organic Compounds in PM2.5 Aerosols in Seoul, Korea
SOYOUNG JUNG, Hyewon Kim, Mi Rae Lee, Min Hye Kim, Youngkwon Kim, Jieun Park, Seung-Muk Yi, Seoul National University, Seoul, Korea
Abstract Number: 857 Working Group: Carbonaceous Aerosol
Abstract Fine particulate matter(PM2.5) which is one of the major air pollutants, is emitted by diverse anthropogenic and natural sources and impacts on climate change directly or indirectly. Furthermore, PM2.5 is classified as carcinogenic to humans (IARC Group 1) and is able to trigger adverse health effects on cardiovascular, respiratory, and central nervous systems. PM2.5 is composed of varied constituents such as water-soluble ions, heavy metals, elemental carbon, and organic carbon. Organic carbon contains various organic compounds which have different emission characteristics depend on each emission source. Thus, identifying the emission characteristic is possible by characterizing the concentration of organic compounds. The aim of this study is to analyze property of PM2.5 and to characterize the concentration of organic compounds in PM2.5 collected from June 2018 to May 2019 in Seoul, Korea by using the sonication extraction method. The sampling site is located on the rooftop of Graduate School of Public Health in Seoul National University (37.465°N, 126.955°E) in Seoul, Korea. The site is in the southwest side of Seoul and is well known for one of the worst air quality region in Seoul. For the analysis of organic compounds, PM2.5 samples were collected using the high volume air sampler (TE-HVPLUS, TISCH, USA). Before the sampling, quartz filters (QMA 1851-865, 203mmx254mm, Whatman, UK) were baked at 450ºC for 12 hours to remove pre-existing organic matters. The pre-baked filter was loaded on the sampler with impactor filter (TE-230-QZ, TISCH, USA) to collect particulate matters less than 2.5µm. For sample extraction, quartz filters collected PM2.5 sample is extracted by using sonication method. In the sonication method, samples were extracted with 30 mL mixture of dichloromethane and methanol (3:1, v/v) for 30minutes. This procedure was repeated once more. The extracts were concentrated to 1mL by using nitrogen gas using TurbovapII (Caliper Life Sciences, USA). Final concentrates were analyzed by gas chromatography/mass spectrometry (GC/MS) (7890A/5975C, Agilent Technologies, USA).