안정동위원소를 이용한 미세먼지 중 오염물질의 기원 추적 연구 = Source Tracking of Pollutants in PM_2.5 Using Stable Isotope Analysis

다국어 초록 (Multilingual Abstract)

The origin of PM2.5 has long been the subject of debate and stable isotopic tools have been applied to decipher. In this study, weekly PM2.5 samples were simultaneously collected at an urban (Seoul) and rural (Baengnyeong Island) site in Korea from January 2014 through July 2016 and δ13C, δ15N, δ15N-NO3-, δ18O-NO3-, and δ15N-NH4+ in PM2.5 were measured. The isotopic results implied that C, NO3-, and NH4+ in PM2.5 from Baengnyeong were nearly originated from coal combustion during winter heating seasons. Whereas, the isotopic values implied that C, NO3- and NH4+ in PM2.5 from Seoul were produced mainly from local vehicle emissions, but during heating seasons, contributions from coal combustion are also important for TC and NO3-. Although the PM2.5 concentrations at Seoul were dominated by secondary inorganic aerosols such as ammonium sulfate and ammonium nitrate, fossil fuel-related NH3 emissions from power plants and vehicles have been less studied in Korea and agricultural activities have been considered the only substantial contributing source even in the urban areas. Additional study on NH3 emission sources and the subsequent reduction of NH3 emissions are required to reduce the formation of PM2.5.