| 淄博市城区臭氧超标期间的VOCs污染特征与来源解析 |
| 摘要点击 2212 全文点击 638 投稿时间：2021-06-23 修订日期：2021-08-17 |
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| 中文关键词 挥发性有机物(VOCs) 臭氧(O3) 污染特征 臭氧生成潜势(OFP) PMF源解析 |
| 英文关键词 volatile organic compounds(VOCs) ozone (O3) pollution characteristics ozone formation potential (OFP) PMF source apportionment |
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| 中文摘要 |
| 近年来，我国城市的臭氧（O3）污染问题日益突出.挥发性有机物（VOCs）是O3生成的重要前体物，因此，了解VOCs主要特征以及来源对控制O3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，O3超标率为67.8%，ρ（VOCs）平均值为140.71 μg·m-3，O3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，O3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%. |
| 英文摘要 |
| In recent years, ozone pollution has been growing increasingly serious in the urban areas of China. Volatile organic compounds (VOCs) are important precursors of O3 formation, which is of great significance to studying the main characteristics and sources of VOCs for controlling O3 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 of ρ(VOCs) was 140.71 μg·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 O3 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. |
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