Source apportionment and chemical reactivity of VOCs based on clustering during summertime in Changzhi
LI Ru-mei1,2, YAN Yu-long1, DUAN Xiao-lin1, WANG Fang-yuan1, NIU Yue-yuan1, WANG Cheng1,2, XU Yang1,2, LI Ying-hui1, HU Dong-mei1, FAN Zhan-chun3, LI Huang-feng3, PENG Lin1
1. Key Laboratory of Resources and Environmental System Optimization, Ministry of Education, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China; 2. School for Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China; 3. Shanxi Ecological Environment Monitoring Center, Taiyuan 030027, China
Abstract:To better understand sources and characteristics of volatile organic compounds (VOCs) pollution in Changzhi, a set of air samples were collected in summer 2017 to study the concentration and chemical reactivity (in the rate of OH radical loss) on ozone generation, and to identify anthropogenic sources of VOCs based on clustering analysis and positive matrix factorization model (PMF). Results revealed that the average concentration and chemical reactivity of total VOCs was 37.40μg/m3 and 5.07s-1, respectively, with the mixing characteristic of the local fresh emissions and aged air masses after oxidation reaction. Five major anthropogenic sources of VOCs with their contribution were identified by PMF: vehicles exhaust (29.7%), coal combustion (29.2%), liquefied petroleum gas/natural gas (LPG/NG) usage (23.5%), industrial processes (11.6%), and solvent usage (6.1%). For fresh emissions, the contribution shares became 34.6%, 38.4%, 10.1%, 8.5%, and 8.5%, respectively. The results suggested that VOCs in Changzhi mainly came from local vehicles exhaust and coal combustion, but LPG/NG usage and industrial processes in neighboring regions could also influence local VOCs via regional transportation processes. Thus, to effectively control the local VOCs emission, a joint prevention and control effort of LPG/NG usage and industrial processes in the neighboring urban area around Changzhi is needed in addition of regulating local vehicles and coal combustion.
李如梅, 闫雨龙, 段小琳, 王芳园, 牛月圆, 王成, 徐扬, 李颖慧, 胡冬梅, 樊占春, 李焕峰, 彭林. 基于聚类分析的长治市夏季VOCs来源及活性[J]. 中国环境科学, 2020, 40(8): 3249-3259.
LI Ru-mei, YAN Yu-long, DUAN Xiao-lin, WANG Fang-yuan, NIU Yue-yuan, WANG Cheng, XU Yang, LI Ying-hui, HU Dong-mei, FAN Zhan-chun, LI Huang-feng, PENG Lin. Source apportionment and chemical reactivity of VOCs based on clustering during summertime in Changzhi. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(8): 3249-3259.
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