Chemical Characteristics and Impact Analysis of VOCs in the Northeast Area of Yixing in Autumn
In order to analyze the chemical characteristics and impact analysis of ozone or secondary organic aero-sol formation of VOCs in the northeast area of Yixing,atmospheric Volatile Organic Compounds(VOCs)were continuously monitored via an online GC～FID/MS system during the autumn of 2022.During the sampling peri-od,the top 10 average concentration of atmospheric VOCs was toluene,meta-xylene/para-xylene,dichloromethane,acetone,ethyl acetate,1,2-dichloroethane,ethane,methyl chloride,ethylene and acetylene successively.In the top 10 ozone formation potential of VOCs,aromatic hydrocarbons OFPs contribution proportion(73.37％)＞olefin OFPs contribution proportion(19.24％)＞oxygenated volatile organic compounds OFPs contribution proportion(7.39％).The top 10 species with the highest contribution of Secondary Organic Aerosol(SOA)generation poten-tial of autumn VOCs in the northeast of Yixing were all aromatic hydrocarbons.According to the analysis meth-ods of correlation ratio of typical VOCs,benzene and toluene were mainly from industrial and solvent emissions.Propylene was mainly from industrial emissions.Isopentane and n-pentane were mainly from petroleum and natu-ral gas emissions in the area.
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