Carbon component pollution characteristics of atmospheric fine particulate matter in iron and steel agglomeration area
In order to measure and characterize the carbon components of atmospheric fine particulate matter(PM2.5)in an iron and steel agglomeration area,PM2.5 was sampled during autumn(Oct 15-Oct 24,2020),winter(Dec 18,2020-Jan 7,2021),and spring(April 23-May 2,2021)in Jinan,Eastern China.The content of organic carbon(OC)and elemental carbon(EC)in PM2.5 was analyzed by a thermal/optical reflectance organic carbon/elemental carbon(OCEC)analyzer.The carbon composition showed significant seasonal change,which decreased with the trend winter＞autumn＞spring.The mass concentrations of OC in the iron and steel agglomeration area were 5.79-12.56 μg·m-3,3.92-55.54 μg·m-3,and 2.14-4.70 μg·m-3 in autumn,winter,and spring,respectively.The EC mass concentrations were 1.34-3.44 μg·m-3,0.38-11.39 μg·m-3,and 0.19-1.33 μg·m-3,in autumn,winter,and spring,respectively.The highest proportion of OC and EC,which accounted for 28.11％and 5.36％of total PM2.5 mass concentration,respectively,was observed in winter,and the lowest was observed in spring(OC,9.82％;EC,1.76％).The mass concentrations of both OC and EC in the area in autumn and winter were higher than that in urban regions,which was 2.12(2.68)and 2.27(4.27)times that of the urban area,respectively,indicating that the pollution of PM2.5 in the autumn and winter of the area was of significant environmental concern.Under different pollution levels with PM2.5 as the primary pollutant,the content of OC4(9.0％)was highest in PM2.5,followed by EC1(7.5％).Both OC4 and EC1 were the main carbon components.The concentrations of SOC were 1.09 μg·m-3,1.79 μg·m-3,and 10.80 μg·m-3 in spring,autumn,and winter,respectively,which accounted for 35.39％,19.02％,and 37.00％of OC mass concentration,respectively,and showed that the SOC pollution of PM2.5 in the steel production area has greater impact in winter than in other seasons.Based on a factor analysis of origin,the carbon components in the iron and steel agglomeration area come mainly from coal combustion and diesel vehicle exhaust emissions.The results provide technical support for the formulation of measures to improve the ambient air quality around the Jinan Iron and Steel Cluster.
iron and steel agglomeration areaatmospheric fine particulate mattercarbon compositionsecondary organic carbonfactor analysis
NETL
NSTL
万方数据
