(주)에이피엠엔지니어링

봄철 광주 도시 및 강릉 항만지점 PM2.5의 화학적, 광흡수 및 분광학적 특성 차이

Differences in Chemical, Light Absorption, and Spectroscopic Characterizations of PM2.5 during Spring at an Urban Site in Gwangju and a Port Site in Gangneung

Abstract

In this study, differences in chemical and light absorption characteristics of PM2.5 between an urban site in

Gwangju and a port site in Gangneung during spring were investigated. Results showed that concentration of NO3

- was significantly high in the urban site where traffic emissions dominated, while OC was observed to be higher in the port site than in the urban site. Relationship between OC and EC concentrations at both sites suggests that carbonaceous particles measured at the urban site were strongly associated with the traffic emissions, on the contrary, they at the port site would have been affected by the traffic emissions as well as other emission sources (e.g., biomass burning). Results of ATR-FTIR (attenuated total reflection-fourier transform infrared) analysis indicated that stronger C=O and v(C=O) peaks appeared at the urban site. The peak of amine (NH2), which is of marine origin, appeared at the port site only. In addition, presence of gypsum, calcite, and syngenite related to dust particles was observed during Asian dust event at the port site. Higher light absorption at 365 nm (Abs365) and absorption Ångström exponent (AAE330-400) values were observed at the port site, implying more amounts of lightabsorbing organic aerosols. Measurements of aerosol light absorption using dual-spot aethalometer at the port site indicated that Abs370 (aerosol total light absorption at 370 nm) and AbsBrC,370 (BrC light absorption at 370 nm) were found to be higher during nighttime (21:00~09:00) than during daytime (09:00~21:00), suggesting they were strongly associated with biomass burning emissions, rather than the traffic emissions, or activities of fishing boats. However, increased light absorption in the morning hours (05:00~09:00) was certainly related with shipping activities.

Key words 

PM2.5, An urban and a port site, ATR-FTIR, Amine (NH2-) peak, Aerosol and BrC light absorption, AAE

▶출처 : 한국대기환경학회지 제 38권 제 3호, 2022.06 pp3.75-393