Particle and aerosol research (한국입자에어로졸학회지)

Korean Association for Particle and Aerosol Research (한국입자에어로졸학회)
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Characterization of fine particulate matter during summer at an urban site in Gwangju using chemical, optical, and spectroscopic methods

화학적·광학적·분광학적 방법을 이용한 광주 도심지역 여름철 초미세먼지의 특성

  • Son, Se-Chang (Department of Environment and Energy Engineering, Chonnam National University) ;
  • Park, Tae-Eon (Department of Environment and Energy Engineering, Chonnam National University) ;
  • Park, Seungshik (Department of Environment and Energy Engineering, Chonnam National University)
  • 손세창 (전남대학교 환경에너지공학과) ;
  • 박태언 (전남대학교 환경에너지공학과) ;
  • 박승식 (전남대학교 환경에너지공학과)
  • Received : 2021.09.09
  • Accepted : 2021.11.02
  • Published : 2021.12.31
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Abstract

Daily PM2.5 was collected during summer period in 2020 in Gwangju to investigate its chemical and light absorption properties. In addition, real-time light absorption coefficients were observed using a dual-spot 7-wavelength aethalometer. During the study period, SO42- was the most important contributor to PM2.5, accounting for on average 33% (10-64%) of PM2.5. The chemical form of SO42- was appeared to be combination of 70% (NH4)2SO4 and 30% NH4HSO4. Concentration-weighted trajectory (CWT) analysis indicated that SO42- particles were dominated by local pollution, rather than regional transport from China. A combination of aethalometer-based and water-extracted brown carbon (BrC) absorption indicated that light absorption of BrC due to aerosol particles was 1.6 times higher than that due to water-soluble BrC, but the opposite result was found in absorption Ångström exponent (AAE) values. Lower AAE value by aerosol BrC particles was due to the light absorption of aerosol BrC by both water-soluble and insoluble organic aerosols. The BrC light absorption was also influenced by both primary sources (e.g., traffic and biomass burning emissions) and secondary organic aerosol formation. Finally the ATR-FTIR analysis confirmed the presence of NH4+, C-H groups, SO42-, and HSO42-. The presence of HSO42- supports the result of the estimated composition ratio of inorganic sulfate ((NH4)2SO4) and bisulfate (NH4HSO4).

Keywords

Acknowledgement

이 논문은 2020년도 정부(교육부)의 재원으로 한국연구재단 기초연구사업의 지원을 받아 수행된 연구입니다(NRF-2020R1I1A3A04036617).

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