도심지역과 배경지역의 대기에서 동시 측정한 PM2.5내 개별유기성분 농도분포

Abstract

Organic aerosols contain thousands of organic compounds and contribute to 20%-90% of the total fine aerosol mass. These organic aerosols originate from anthropogenic and natural (biogenic and geologic) sources and alter physical and chemical properties in the atmosphere depending on the atmospheric and meteorological conditions. To understand the characteristics of organic compounds in PM2.5, about one hundred individual organic compounds in PM2.5 at Seoul (urban area) and Baengnyeong Island (remote area) were identified and quantified using gas chromatography/mass spectrometry (GC/MS). PM2.5 sampling was carried out during Dtwo campaigns, one is MAPS-Seoul and other is KORUS-AQ. MAPS-Seoul campaigns was conducted from May to June, 2015 and KORUS-AQ was run between May and June, 2016. Organic compounds analyzed in this study were classified into six groups, n-alkanes, polycyclic aromatic hydrocarbons (PAHs), hopanes, fatty acids (FA), dicarboxylic acids (DCAs), and sugars. Daily variation of organic compounds concentrations at Seoul were higher than Baengnyeong Island. Through correlations of organic compounds with other air pollutants and factor analysis at both sites, it found that major factors (or source) for the determination of organic compounds concentrations at Seoul and Baengnyeong Island were different. The major sources at Seoul were anthropogenic sources such as vehicular emission and coal combustions, while, SOA formation and biomass burning were more attributed to the organic compounds concentrations at Baengnyeong Island.