长治市大气中VOCs污染特征及其光化学分析

Pollution Characteristics and Photochemical Analysis of VOCs in Changzhi City

对2021年长治市主城区空气中挥发性有机物(VOCs)进行采样分析,获得其检出物质的种类、含量、浓度变化规律,分析不同VOCs的来源,并计算不同VOCs物种的臭氧生成浅势(OFP)。结果表明:长治市主城区VOCs自动监测站点共检出115种物质,VOCs污染年平均值跨度范围为21.236~40.026 ppb,非甲烷总烃日平均值跨度范围为:313.1~490.8 ppb,OFP平均估算值为162.239μg/m^(3),OFP贡献最大的因子为乙烯、乙醛、其次为:间/对二甲苯、丙醛、甲苯、丙烯、异戊二烯、邻二甲苯、正丁烷、1,1-二氯乙烷。SOAp平均估算值为1.726μg/m^(3),SOAp贡献最大为异戊二烯、其次为甲苯、间/对二甲苯、苯等。

The volatile organic compounds(V0Cs)in the air of the main urban area of Changzhi City in 2021 were sampled and analyzed to obtain the variety,content and concentration of the detected substances,analyze the sources of different VOCs,and calculate the ozone generation potential(OFP)of different VOCs species.The results showed that 115 substances were detected at the VOCs automatic monitoring stations in the main urban area of Changzhi City.The annual average value span of V0Cs pollution was 21.236~40.026 ppb,the daily average value span of non methane total hydrocarbons was 313.1~490.8 ppb,and the average estimated value of OFP was 162.239 ug/m^(3).The factors contributing most to OFP were ethylene,acetaldehyde,followed by M/p-xylene,propionaldehyde,toluene,propylene,isoprene,o-xylene,n-butane 1,1-dichloroethane.The average estimated value of SOAp is 1.726 mg/m^(3),and isoprene contributes the most to SOAp,followed by toluene,M/p-xylene,benzene,etc.