화학적 조성과 안정동위원소 비 분석을 이용한 PM 2.5 발생원 추적

To investigate the traceability of air pollutants using isotopes of the same age, atmospheric ultra-fine dust (PM2.5) was collected during a period of high pollution (such as the yellow dust season) at a suburban air quality monitoring station (Padori, Chungcheong-namdo) to analyze its ions, chemical composition characteristics, elements, and stable isotopes. Three to four samples were collected (24 hours per cycle) monthly from March to December 2015. The level of pollution in Korea is relatively low during July and August, therefore, these months were excluded from the sampling period. A high-volume air sampler, equipped with a PM2.5 impactor, was used to analyze seven ionic components (including NO3 -, SO4 2-, and NH4 +), fifteen heavy-metals (including K, Ca, Pb, Cu, and Zn), and the ratios of three stable isotopes (δ13C, δ15N, and δ34S). When the level of pollution exceeded 50 μg/ ㎥ for 24 hours, the concentration of ultra-fine dust was within a range of 59.6-125.4 μg/m3. The concentration of ionic components was within a range of 6.6-10.3 μg/ ㎥, while that of heavy metals was within a range of 6.63-10.30 μg/ ㎥. The average values of δ13C, δ15N and δ34S from the stable isotope analysis during the non-pollution period were -25.2±1.6‰, 3.2±3.9‰, and 4.2±1.7‰, respectively. The results of this study were compared with those from existing literature on stable isotope ratios, which confirmed that the atmosphere is being affected by coal, petroleum combustion, and pollen.