摘要
2019年6~9月在成都市区对挥发性有机物(VOCs)进行在线观测,研究夏季VOCs浓度水平、变化特征、臭氧生成贡献(OFP)及来源贡献.结果表明,成都市区夏季TVOCs(总挥发性有机物)平均质量浓度为112.66μg·m^-3,烷烃(29.51%)和卤代烃(23.23%)为主要组分;VOCs日变化峰值主要出现在上午10:00~11:00,受城市机动车、油气挥发和工业排放影响;夏季VOCs的OFP贡献中芳香烃贡献率(42.7%)最高,其次为烯烃(27.4%),关键活性物种为间/对-二甲苯、乙烯、丙烯、邻-二甲苯、异戊烷、环戊烷和丙烯醛等;使用PMF受体模型进行来源解析表明,移动源为成都市区夏季VOCs的主要贡献源,贡献率为34%,其次为工业源(17%)和油气挥发(14%),溶剂使用源和天然源分别贡献11%和13%.因此,机动车和工业排放为成都市区VOCs的重点控制源,同时溶剂使用及油气挥发等污染源的管控也不可忽视.
In the research,volatile organic compounds(VOCs)were observed online in urban areas of Chengdu to study VOC concentration level,change characteristics,ozone generation contribution(OFP),and source contribution from June to September2019.The results showed that the average concentration of TVOCs(total volatile organic compounds)was 112.66μg·m^-3,with alkanes(29.51%)and halogenated hydrocarbons(23.23%)forming the main components.The diurnal peak in VOCs mainly occurred from 10:00 am to 11:00 am,which is affected by urban motor vehicles,oil or gas volatilization,and industrial emissions.For OFP contribution of VOCs in summer,the contribution rate of aromatic hydrocarbons(42.7%)was the highest,followed by alkenes(27.4%).The key active species were m/p-xylene,ethylene,propylene,o-xylene,isopentane,cyclopentane,and acrolein.According to the source analysis by the PMF model,mobile sources are the main contributors of VOCs in summer in Chengdu,contributing 34%to TVOCs,followed by industrial sources(17%),volatile oil and gas(14%),and solvent use and natural sources contributing 11%and 13%.Therefore,motor vehicle and industrial emissions are the key control sources of VOCs in Chengdu,although control of pollution sources such as solvent use and oil or gas volatilization cannot be ignored.
作者
徐晨曦
陈军辉
姜涛
韩丽
王波
李英杰
王成辉
刘政
钱骏
XU Chen-xi;CHEN Jun-hui;JIANG Tao;HAN Li;WANG Bo;LI Ying-jie;WANG Cheng-hui;LIU Zheng;QIAN Jun(Sichuan Academy of Environmental Sciences,Chengdu 610000,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2020年第12期5316-5324,共9页
Environmental Science
基金
国家重点研发计划项目(2018YFC0214001,2018YFC0214006)。
