Atmospheric isoprene and monoterpenes in a typical urban area of Beijing： Pollution characterization, chemical reactivity and source identification  

作　　者：Xi Cheng Hong Li Yujie Zhang Yuping Li Weiqi Zhang Xuezhong Wang Fang Bi Hao Zhang Jian Gao Fahe Chai Xiaoxiu Lun Yizhen Chen Junyi Lv 

机构地区：[1]School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100011, China [2]State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China [3]Collaborative Innovation Center on Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology, Nanjing 210044, China [4]Environmental Research Institute, Shandong University, Jinan 250100, China [5]College of Engineering, Shantou University, Shantou 515000, China [6]College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China [7]Shanghai Thunder Environmental Technology CO., Ltd., Shanghai, 200235, China

出　　处：《Journal of Environmental Sciences》2018年第9期150-167,共18页环境科学学报（英文版）

基　　金：supported by the Project of China National Science and Technology Support Plan (Grant No. 2014BAC23B01);the Project of China Environmental Protection Public Science and Technology Research Fund (Grant No. 201409005 and No. 201509002);the Strategic Pilot Science and Technology Project of the Chinese Academy of Sciences (Class B) (Grant No. XDB05010200)

摘　　要：Continuous observation of isoprene, β-pinene and β-pinene was carried out in a typical urban area of Beijing from March 2014 to February 2015, using an AirmoVOC online analyzer. Based on the analysis of the ambient level and variation characteristics of isoprene, β-pinene and β- pinene, the chemical reactivity was studied, and their sources were identified. Results showed that the concentrations of isoprene, α-pinene and β-pinene in the urban area of Beijing were lower than those in richly vegetated areas; the concentrations of isoprene were at a moderate level compared with those of previous studies of Beijing. Concentrations of isoprene, α-pinene and β-pinene showed different seasonal, monthly, daily and diurnal variations, and all of the three species showed higher level at night than those in the daytime as a whole, the variations of isoprene, α-pinene and β-pinene mainly influenced by emission of sources, photochemical reaction, and meteorological parameters. Isoprene was the largest contributor to the total OFP values than β-pinene and β-pinene. α-Pinene was the largest contributor to the total SOAFP values than isoprene and β-pinene in autumn, while isoprene was the largest one in other seasons. Isoprene, α-pinene and β-pinene were derived mainly from biological sources; and α- pinene level were also affected by industrial sources. To reduce the concentrations of isoprene, α-pinene and β-pinene, it is necessary to scientifically select urban green plant species, and more strict control measures should be taken to reduce the emission of β-pinene from industrial sources, such as artificial flavors and resins synthesis processes.Continuous observation of isoprene, β-pinene and β-pinene was carried out in a typical urban area of Beijing from March 2014 to February 2015, using an AirmoVOC online analyzer. Based on the analysis of the ambient level and variation characteristics of isoprene, β-pinene and β- pinene, the chemical reactivity was studied, and their sources were identified. Results showed that the concentrations of isoprene, α-pinene and β-pinene in the urban area of Beijing were lower than those in richly vegetated areas; the concentrations of isoprene were at a moderate level compared with those of previous studies of Beijing. Concentrations of isoprene, α-pinene and β-pinene showed different seasonal, monthly, daily and diurnal variations, and all of the three species showed higher level at night than those in the daytime as a whole, the variations of isoprene, α-pinene and β-pinene mainly influenced by emission of sources, photochemical reaction, and meteorological parameters. Isoprene was the largest contributor to the total OFP values than β-pinene and β-pinene. α-Pinene was the largest contributor to the total SOAFP values than isoprene and β-pinene in autumn, while isoprene was the largest one in other seasons. Isoprene, α-pinene and β-pinene were derived mainly from biological sources; and α- pinene level were also affected by industrial sources. To reduce the concentrations of isoprene, α-pinene and β-pinene, it is necessary to scientifically select urban green plant species, and more strict control measures should be taken to reduce the emission of β-pinene from industrial sources, such as artificial flavors and resins synthesis processes.

关 键 词：Ambient air ISOPRENE MONOTERPENES Pollution characteristics Emission sources BEIJING 

分 类 号：X131.1[环境科学与工程—环境科学]