감쇄 전반사 FTIR 기법을 이용한 광주광역시 봄철 PM2.5의 화학적 특성 분석 (Analysis of Chemical Characteristics of PM2.5 during Spring in Gwangju Using Attenuated Total Reflectance FTIR Technique)

서지정보

· 발행기관 : 한국대기환경학회
· 수록지 정보 : 한국대기환경학회지 / 36권 / 2호 / 171 ~ 184페이지
· 저자명 : 손세창, 유근혜, 박승식, 이상일

초록

In this study, ATR-FTIR (Attenuated Total Reflectance - Fourier Transform Infrared Spectroscopy) analysis was applied to filter samples to identify the organic functional groups and inorganic components in PM2.5 collected during the period of March 9 through April 8, 2018 at an urban site of Gwangju. In addition, 24-hr PM2.5 samples were used to analysis the organic and elemental carbon (OC and EC), water-soluble OC (WSOC), humic-like substances (HULIS), and 8 ionic species.
The average concentrations of PM2.5, OC, EC, NH4 +, NO3 -, and SO4 2- during the study period were 28.1, 5.6, 1.1, 4.4, 6.5, and 5.8 μg/m3, respectively. Concentration of PM2.5 exceeding a 24-hr Korean PM2.5 standard of 35 μg/m3 was linked to rapid increase in concentrations of NO3 - and NH4 +. High concentration of PM2.5 was attributed to stable meteorological conditions, such as high surface pressures around Korean peninsula and low wind speed, resulting in accumulation of air pollutants and enhanced formation of secondary aerosol particles. Strong correlations of OC with WSOC (R2=0.91), HULIS (R2=0.96), and K+ (R2=0.96) were found, suggesting that OC, WSOC, and HULIS were strongly associated with biomass burning emissions. ATRFTIR analyses showed the presence of carbonyl groups (C=O), organonitrate (R-O-N-O), and inorganic secondary ionic species (NH4 +, NO3 -, and SO4 2-) in all PM2.5 samples. In addition, the presence of methylene groups (C-H), which can detect the effects of biomass burning emissions, was confirmed. Peaks of methylene groups appeared on one third of 30 samples (9 days), during which the concentrations of K+ and HULIS increased. Finally, the ATR-FTIR analysis indicated the presence of carbonyl group in the urban study site and also methylene group possibly due to biomass burning emissions, identifying the possible emission sources of PM2.5 in Gwangju in spring 2018.

영어초록

In this study, ATR-FTIR (Attenuated Total Reflectance - Fourier Transform Infrared Spectroscopy) analysis was applied to filter samples to identify the organic functional groups and inorganic components in PM2.5 collected during the period of March 9 through April 8, 2018 at an urban site of Gwangju. In addition, 24-hr PM2.5 samples were used to analysis the organic and elemental carbon (OC and EC), water-soluble OC (WSOC), humic-like substances (HULIS), and 8 ionic species.
The average concentrations of PM2.5, OC, EC, NH4 +, NO3 -, and SO4 2- during the study period were 28.1, 5.6, 1.1, 4.4, 6.5, and 5.8 μg/m3, respectively. Concentration of PM2.5 exceeding a 24-hr Korean PM2.5 standard of 35 μg/m3 was linked to rapid increase in concentrations of NO3 - and NH4 +. High concentration of PM2.5 was attributed to stable meteorological conditions, such as high surface pressures around Korean peninsula and low wind speed, resulting in accumulation of air pollutants and enhanced formation of secondary aerosol particles. Strong correlations of OC with WSOC (R2=0.91), HULIS (R2=0.96), and K+ (R2=0.96) were found, suggesting that OC, WSOC, and HULIS were strongly associated with biomass burning emissions. ATRFTIR analyses showed the presence of carbonyl groups (C=O), organonitrate (R-O-N-O), and inorganic secondary ionic species (NH4 +, NO3 -, and SO4 2-) in all PM2.5 samples. In addition, the presence of methylene groups (C-H), which can detect the effects of biomass burning emissions, was confirmed. Peaks of methylene groups appeared on one third of 30 samples (9 days), during which the concentrations of K+ and HULIS increased. Finally, the ATR-FTIR analysis indicated the presence of carbonyl group in the urban study site and also methylene group possibly due to biomass burning emissions, identifying the possible emission sources of PM2.5 in Gwangju in spring 2018.

참고자료

· 없음