Volatile Organic Compounds in the North China Plain: Characteristics, Sources, and Effects on Ozone Formation
Volatile Organic Compounds in the North China Plain: Characteristics, Sources, and Effects on Ozone Formation
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DOI：
10.3390/atmos14020318
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发表时间：
2023-02
期刊：
影响因子：
2.9
通讯作者：
X. Yang;Luhong Gao;Shiyang Zhao;Guang Pan;Guo-lan Fan;Zhiyong Xia;Xiao-yan Sun;Hong-yu Xu
中科院分区：
文献类型：
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作者：
X. Yang;Luhong Gao;Shiyang Zhao;Guang Pan;Guo-lan Fan;Zhiyong Xia;Xiao-yan Sun;Hong-yu Xu
2020年6月在中国临沂对臭氧超标天数进行了增强挥发性有机化合物（VOCs）观测。共收集到69种VOC（1种炔、29种烷烃、10种烯烃、14种芳烃和15种含氧挥发性有机化合物（OVOC））。总挥发性有机物（TVOCs）平均浓度为36.0 ± 0.66 ppb，其中烷烃、OVOCs和芳烃的含量居前3位，分别占40.75%、27.02%和11.30%。基于正矩阵因子分解（PMF）模型，将临沂市VOCs的主要来源划分为机动车尾气源（39.11%）、生物质燃烧源（21.82%）、油气挥发源（21.46%）和溶剂使用源（17.61%）。臭氧生成潜势（OFP）的贡献率主要是烯烃，OVOCs和芳烃，贡献率分别为26.37%，25.30%和23.65%。对OFP贡献最大的前六种VOCs是甲醛、乙醛、1-丁烯、丁二烯、反式-2-丁烯和丙烯。经验动力学模拟方法（EKMA）曲线表明，现场臭氧（O3）的产生受VOCs的限制，按照VOCs/NOx浓度比为1.15的原则降低O3前体物浓度，可以更有效地控制O3污染。
Enhanced volatile organic compounds (VOCs) observations were made on ozone-exceeding days in June 2020 in Linyi, China. A total of 69 VOCs were collected (1 alkyne, 29 alkanes, 10 alkenes, 14 aromatic hydrocarbons, and 15 oxygenated volatile organic compounds (OVOCs)). The average concentration of total VOCs (TVOCs) was 36.0 ± 0.66 ppb, and the top three VOCs components were alkanes, OVOCs, and aromatic hydrocarbons, which accounted for 40.75%, 27.02%, and 11.30%, respectively. Based on the positive matrix factorization (PMF) model, the main sources of VOCs in Linyi City were divided into vehicle exhaust sources (39.11%), biomass combustion sources (21.82%), oil and gas volatilization sources (21.46%), and solvent use sources (17.61%). The ozone formation potential (OFP) contribution rate was dominated by alkenes, OVOCs, and aromatics, with contribution rates of 26.37%, 25.30%, and 23.65%, respectively. The top six VOCs that contributed the most to the OFP were formaldehyde, acetaldehyde, 1-butene, butadiene, trans-2-butene, and propylene. The empirical kinetic modelling approach (EKMA) curve indicated that the in situ ozone (O3) production was limited by VOCs, and reducing the concentration of O3 precursors in accordance with the VOCs/NOx concentration ratio of 1.15 can control O3 pollution more effectively.