통계분석을 이용한 광주지역 휘발성유기화합물의 특성 연구
A Study on Characteristics of VOCs in Gwangju Using Statistical Analysis
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This study was conducted to investigate the concentration distribution of VOCs (volatile organic compounds) and the contribution of nitric oxides and VOCs to ozone creation in Gwangju. Fifty-two types of VOCs were continually measured by the hour at sampling sites in Seoseok-dong and Geonguk-dong from May to September 2015. Paraffins took up 52.1% of the entire VOCs, followed by aromatics and olefins. The monthly concentration of VOCs was highest in June and lowest in August. As for the hourly concentrations of ozone and nitric oxides, ozone concentrations started to increase from 7 am and got to the highest point during the daytime, whereas nitric oxides showed the opposite trend from ozone by reaching the lowest level during the daytime. The photochemical ozone creation potentials (POCPs) of toluene, isopentane, m,p-xylene, isobutane and 1-butene were 16.0%, 14.2%, 12.7%, 8.3% and 7.5% respectively. These five components together accounted for 58.7% of the total POCPs, which means they are the main contributor to ozone creation. The correlation analysis showed that PM-10 and PM-2.5 (r=0.810, p<0.01), O3 and radiation (r=0.448, p<0.01), and O3 and humidity (r=-0.563, p<0.01) were significant. The results of factor analysis showed that the VOCs were mainly affected by the emission of vehicles and the evaporation of diesel fuel.
Abstract
This study was conducted to investigate the concentration distribution of VOCs (volatile organic compounds) and the contribution of nitric oxides and VOCs to ozone creation in Gwangju. Fifty-two types of VOCs were continually measured by the hour at sampling sites in Seoseok-dong and Geonguk-dong from May to September 2015. Paraffins took up 52.1% of the entire VOCs, followed by aromatics and olefins. The monthly concentration of VOCs was highest in June and lowest in August. As for the hourly concentrations of ozone and nitric oxides, ozone concentrations started to increase from 7 am and got to the highest point during the daytime, whereas nitric oxides showed the opposite trend from ozone by reaching the lowest level during the daytime. The photochemical ozone creation potentials (POCPs) of toluene, isopentane, m,p-xylene, isobutane and 1-butene were 16.0%, 14.2%, 12.7%, 8.3% and 7.5% respectively. These five components together accounted for 58.7% of the total POCPs, which means they are the main contributor to ozone creation. The correlation analysis showed that PM-10 and PM-2.5 (r=0.810, p<0.01), O3 and radiation (r=0.448, p<0.01), and O3 and humidity (r=-0.563, p<0.01) were significant. The results of factor analysis showed that the VOCs were mainly affected by the emission of vehicles and the evaporation of diesel fuel.
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