Establishment Of VOCs Analysis System And Verification And Application Of Urban Air Quality Detection

Air pollution control is the key point of environmental pollution control in China.Analysis of volatile organic pollutants(VOCs)which is the main component of air pollution and the source of other secondary pollutants,is very important.In this work,based on the existing laboratory equipments,GC-MS was selected as the key instrument to build a VOCs analysis system.In 2018,47 VOCs analysis systems were built,which can detect 25 alkanes,7 alkenes and 15 aromatic hydrocarbons.Using this method,the VOCs samples collected in Fujian Province in October 2018 were analyzed.On October23 2018,the mass concentration of VOCs is between 18.66-1180.85 μg/m~3.And between October 22 to 28,the daily mass concentration of VOCs is between10.15-1180.85 μg/m~3.The major VOCs groups are alkanes.The VOCs species of the first ten species include n-pentane,isopentane,2-methyl pentane,hexane,toluene and benzene.VOCs is the main source of solvent for human sources and vehicle emission sources.In 2019,the analysis system has been improved to analyze 89 VOCs,including 29 alkanes,12 alkynes,16 aromatic hydrocarbons,31 halogenated hydrocarbons and 1nitrile compound.Using this method,the VOCs samples collected in Shenyang in July2019 were analyzed.。On October 5th,the mass concentration of VOCs is between29.66-558.35 μg/m~3.And between July 3 to 9,the mass concentration of VOCs is between 39.16-262.77 μg/m~3.The major VOCs groups are alkanes and halogenated hydrocarbons.The VOCs species of the first ten species include isopentane,n-hexane,2,3-dimethylbutane and 2-methylheptane.VOCs is the main source of industrial process sources and vehicle emission sources.