摘要
近年来,我国城市的臭氧(O_(3))污染问题日益突出.挥发性有机物(VOCs)是O_(3)生成的重要前体物,因此,了解VOCs主要特征以及来源对控制O_(3)污染具有重要意义.于2019年5~9月在淄博市开展了在线VOCs观测,共计监测56个物种.观测期间,O_(3)超标率为67.8%,ρ(VOCs)平均值为140.71μg·m^(-3),O_(3)超标日的VOCs浓度为非超标日的1.04倍.从VOCs组分结构上看,浓度从高到低依次为:芳香烃>烷烃>烯烃>炔烃.其中1,3,5-三甲苯、邻-乙基甲苯、1-丁烯和正己烷为超标日和非超标日排放较高的物种.臭氧生成潜势(OFP)中芳香烃和烯烃贡献较大.由PMF源解析结果得出,该城区VOCs来源主要包括机动车源、固定燃烧源、溶剂使用源、工艺过程源和天然植物源,其中机动车源为该城区最主要的VOCs来源.此外,O_(3)超标日的机动车源占比为32.3%,固定燃烧源占比为24.2%,相比于非超标日分别升高了3.3%和6.9%;而溶剂使用源和工艺过程源占比却相比于非超标日都降低了5.1%.
In recent years,ozone pollution has been growing increasingly serious in the urban areas of China.Volatile organic compounds(VOCs)are important precursors of O_(3) formation,which is of great significance to studying the main characteristics and sources of VOCs for controlling O_(3) pollution.In this study,we conducted online VOCs observation in Zibo City from May to September in 2019,monitoring 56 species in total.During the observation,the over-standard rate of ozone was up to 67.8%,the average ofρ(VOCs)was 140.71μg·m^(-3),and the concentration of VOCs in the ozone over standard days was 1.04 times that on the non-standard days.The rank of VOC classes was aromatic hydrocarbons>alkanes>alkenes>alkynes.Among them,1,3,5-tritoluene,o-ethyltoluene,1-butene,and n-hexane achieved high emission in the exceeding O_(3)and non-exceeding days.Aromatic hydrocarbon and alkenes contributed more to the potential of ozone formation.According to the PMF source analysis results,VOCs sources in the urban area mainly included motor vehicle sources,fixed combustion sources,solvent sources,process sources,and natural plant sources,among which motor vehicle sources were the most important source of VOCs in the urban area.In addition,motor vehicle sources accounted for 32.3%,and fixed combustion sources accounted for 24.2%on days when ozone exceeded the standard,which increased by 3.3%and 6.9%,respectively,compared with those on days when ozone did not exceed the standard.However,the proportion of solvent sources and process sources decreased by 5.1%when ozone exceeded the standard compared with that on a non-standard day.
作者
王帅
王秀艳
杨文
王雨燕
白瑾丰
程颖
WANG Shuai;WANG Xiu-yan;YANG Wen;WANG Yu-yan;BAI Jin-feng;CHENG Ying(College of Environmental Science and Engineering,Nankai University,Tianjin 300350,China;Chinese Research Academy of Environmental Sciences,Beijing 100012,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2022年第3期1277-1285,共9页
Environmental Science
基金
大气重污染成因与治理攻关项目(DQGG0107-20)
淄博市空气质量调控综合决策支撑体系服务项目。
