重庆市中心城区大气VOCs季节污染特征与来源解析  

Seasonal Pollution Characteristics and Source Apportionment of Atmospheric VOCs in Central Urban Area of Chongqing

作　　者：姚佳 李振亮 陈木兰 李陵 徐芹 方维凯 彭超 翟崇治 王锋文[2] 卢培利[2] YAO Jia;LI Zhen-liang;CHEN Mu-lan;LI Ling;XU Qin;FANG Wei-kai;PENG Chao;ZHAI Chong-zhi;WANG Feng-wen;LU Pei-li(Key Laboratory for Urban Atmospheric Environment Integrated Observation&Pollution Prevention and Control of Chongqing,Chongqing Research Academy of EcoEnvironmental Sciences,Chongqing 401147,China;Department of Environmental Science,College of Environment and Ecology,Chongqing University,Chongqing 400045,China)

机构地区：[1]重庆市生态环境科学研究院,城市大气环境综合观测与污染防控重庆市重点实验室,重庆401147 [2]重庆大学环境与生态学院,环境科学系,重庆400045

出　　处：《环境科学》2025年第2期764-773,共10页Environmental Science

基　　金：国家重点研发计划项目(2023YFC3708505);国家自然科学基金项目(42305126);重庆市科研机构绩效激励引导专项(CSTB2023JXJL-YFX0042)。

摘　　要：基于重庆市中心城区2021年6月至2022年5月的大气VOCs在线观测数据,分析了VOCs的季节污染特征、二次污染物生成潜势及其来源.结果表明,重庆市中心城区φ(VOCs)均值为31.5×10^(-9),其中烷烃占比最高(39.6%),其次是含氧VOCs(OVOCs)(15.6%)、卤代烃(13.9%)、芳香烃(11.6%)、烯烃(10.5%)和炔烃(8.3%).时间上呈现出冬季(35.7×10^(-9))>秋季(32.5×10^(-9))>夏季(31.3×10^(-9))>春季(27.6×10^(-9))的体积分数变化特征.夏季芳香烃对臭氧生成贡献最高,其中臭氧生成潜势(OFP)较高的物种是1,2,4-三甲苯、甲苯和间/对-二甲苯.冬季芳香烃对二次有机气溶胶(SOA)生成潜势贡献率高达96%,其中甲苯和间/对-二甲苯是SOA生成潜势的主要贡献物种.夏季VOCs的主要来源是机动车排放源(30.9%)、工业源(21.2%)和溶剂使用源(18.6%),冬季的主要来源是机动车排放源(35.8%)、燃烧源(30.9%)和工业源(20.6%),冬季燃烧源对VOCs的贡献(30.9%)显著高于夏季(17.4%).The long-term seasonal pollution characteristics,environmental effects,and sources of atmospheric volatile organic compounds(VOCs) were investigated based on the one-year(06/2021-05/2022) online observation data of VOCs in the central urban area of Chongqing.The results showed that during the observation period,the mean value of φ(VOCs) was 31.5×10~(-9),of which alkane accounted for the highest proportion(39.6%),followed by oxygenated VOCs(OVOCs)(15.6%),halogenated hydrocarbons(13.9%),aromatic hydrocarbons(11.6%),olefin(10.5%),and alkyne(8.3%).In terms of time,the volume fraction changed to winter(35.7×10~(-9)) > autumn(32.5×10~(-9)) > summer(31.3×10~(-9)) > spring(27.6×10~(-9)).In summer,the highest contribution of aromatic hydrocarbons to ozone generation was observed in 1,2,4-tritylene,toluene,and m/p-xylene species with higher ozone generation potential(OFP).In winter,the contribution of aromatic hydrocarbons to the formation potential of secondary organic aerosols(SOA) was as high as 96%,and toluene and m/p-xylene were the main contributing species to the formation potential of SOA.The main sources of VOCs in summer were motor vehicle emissions(30.9%),industrial emissions(21.2%),and solvent use sources(18.6%),and the main sources in winter were motor vehicle exhaust(35.8%),combustion sources(30.9%),and industrial sources(20.6%).The contribution of combustion sources to VOCs in winter(30.9%) was significantly higher than that in summer(17.4%).

关 键 词：挥发性有机物(VOCs) 污染特征 臭氧生成潜势(OFP) 二次有机气溶胶生成潜势(SOAFP) 来源解析 

分 类 号：X511[环境科学与工程—环境工程]