Source apportionment of VOCs in a typical medium-sized city in North China Plain and implications on control policy.
Source apportionment of VOCs in a typical medium-sized city in North China Plain and implications on control policy.
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DOI：
10.1016/j.jes.2020.10.005
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发表时间：
2021-09
影响因子：
6.9
通讯作者：
Juanjuan Qin;Xiaobo Wang;Yanrong Yang;Yuanyuan Qin;Shaoxuan Shi;Peihua Xu;Rongzhi Chen;Xueming Zhou;Jihua Tan;Xinming Wang
中科院分区：
文献类型：
--
作者：
Juanjuan Qin;Xiaobo Wang;Yanrong Yang;Yuanyuan Qin;Shaoxuan Shi;Peihua Xu;Rongzhi Chen;Xueming Zhou;Jihua Tan;Xinming Wang
我国大城市大气中挥发性有机物（VOCs）的特征已得到广泛研究，但华北平原中小城市的VOCs特征研究较少。2019年5月至9月，在NCP的一个中等城市进行了一项关于VOCs可能来源的综合研究。在许昌市8个采样点共采集143个挥发性有机物样品，检出57种挥发性有机物。平均VOC浓度为42.6 ± 31.6 μg/m3，分别为53.7 ± 31.0 μg/m3和32.1 ± 27. 8 μg/m3。烯烃和芳烃贡献了总臭氧生成潜势（OFP）的80%。芳烃占二次有机气溶胶潜势（SOAP）的95%以上。挥发性有机化合物主要来自本地排放，并从东南方向输送。PMF分析提取了6个污染源，（33.1%），使用液化石油气（19.3%）、汽车尾气和燃油蒸发（15.8%），溶剂使用其中，工业污染源占15.2%，生物污染源占7.51%，分别占33.4%、17.6%、12.9%、18.6%、9.28%和8.22%。燃烧和液化石油气使用是许昌市挥发性有机污染物的主要来源，燃烧、溶剂使用和液化石油气使用是许昌市挥发性有机污染物的主要来源，这与我国特大城市机动车尾气、溶剂使用和工业污染贡献较大的情况不同，建议许昌市等中等城市应采取针对性的控制策略。
Characteristics of atmospheric VOCs (volatile organic compounds) have been extensively studied in megacities in China, however, they are scarcely investigated in medium/small-sized cities in North China Plain (NCP). A comprehensive research on possible sources of VOCs was conducted in a medium-sized city of NCP, from May to September 2019. A total of 143 canister samples of 8 sites in Xuchang city were collected, and 57 VOC species were detected. The average VOC concentrations were 42.6 ± 31.6 μg/m3, with 53.7 ± 31.0 μg/m3and 32.1 ± 27. 8 μg/m3, in the morning and afternoon, respectively. Alkenes and aromatics contributed 80% of the total ozone formation potential (OFP). Aromatics accounted for more than 95% of secondary organic aerosol potential (SOAP). VOCs were dominated by the local emission with significant transport from the southeast direction. PMF analysis extracted 6 sources, which were combustion (33.1%), LPG usage (19.3%), vehicular exhaust & fuel evaporation (15.8%), solvent usage (15.2%), industrial (9.11%) and biogenic (7.51%), respectively and they contributed 33.4%, 17.6%, 12.9%, 18.6%, 9.28% and 8.22% to the OFP, respectively. Combustion and LPG usage were the dominant VOC sources; and combustion, solvent usage and LPG usage were the main sources of OFP in Xuchang city, which were different to megacities in China with a high contribution from vehicular exhaust, solvent usage and industry, suggesting specific control strategies on VOCs need to be implemented in medium-sized city such as Xuchang city.