earticle

영어

The purpose of this study is to identify the characteristics of mass concentration and chemical structure of PM2.5 in 2011~2013 at a metropolitan air monitoring station located in an urban area and at a station in Baengnyeong, which is a reference site. Mass concentration measured by the metropolitan station was 29.3 μg/m3, 25.2 μg/m3, and 29.5 μg/m3 and the one by the Baengnyeong station was 23.9 μg/m3, 18.1 μg/m3, and 23.3 μg/m3 for 2011 to 2013 respectively. This result shows that the mass concentration is higher in the urban area than in the reference site as well as lower in 2012 than in 2011. The level of PM2.5 increased at 2013 compared with 2012, and 2013 was similar with 2011 level. The ion analysis result showed that SO42−, NO3− and NH4+ concentrations were high and more than 97% of SO42− was nss-SO42−. The ratio between OC and EC was 2.5~3.5. The SOC level was measured higher at the metropolitan station than at the one in Baengnyeong and during summer than in other seasons. Based on the elemental component analysis, it was found that high concentrations of Si, K and Fe were contained in the earth crust and the main substances of trace metals were Pb, Ba, Cu, Cs and Br. By conducting mass closure using the component analysis results, the study also found that the main components of PM2.5 were 51~56% of ion compounds, 18~23% of carbon compounds and 5~8% of element compounds.

한국어

도시지역인 서울지역과 대조지역인 백령도에서 2011년부터 2013년까지 PM2.5 질량농도와 화학조성 특성을 살펴보았다. 서울지역의 질량농도는 2011년 29.3 μg/m3, 2012년 25.2 μg/m3, 2013년 29.5 μg/m3, 백령도의 질량농도는 2011년 23.9 μg/m3, 2012년 18.1 μg/m3, 2013년 23.3 μg/m3로 나타나 도시지역이 높게 나타났다. 2012년은 2011년보다 농도가 감소하였으며, 2013년은 2012년보다 농도가 증가하여 2011년과 비슷한 수준이었다. 이온분석 결과 SO42−, NO3−, NH4+ 이 높게 나타났으며, SO42− 중 nss-SO42− 가 97% 이상으로 나타났다. OC와 EC의 비는 2.5~3.5로 나타났으며, SOC는 백령도보다 서울에서, 여름철에 SOC 농도가 높게 나타났다. 금속원소성분을 분석한 결과, 지각성분은 Si, K, Fe가 높은 농도를 나타냈으며,미량금속의 주요물질은 Pb, Ba, Cu, Cs, Br로 나타났다. 성분분석 결과를 이용하여 mass closure 한 결과, PM2.5의 주요 성분은 이온성분 51~56% >탄소성분 18~23% >원소성분 5~8%로 나타났다.