Characteristics and Sources of VOCs at Different Ozone Concentration Levels in Tianjin

被引：2

作者：

Wang W.-M. ^{[1
]}

Gao J.-Y. ^{[2
]}

Xiao Z.-M. ^{[2
]}

Li Y. ^{[2
]}

Bi W.-K. ^{[2
]}

Li L.-W. ^{[2
]}

Yang N. ^{[2
]}

Xu H. ^{[2
]}

Kong J. ^{[2
]}

机构：

[1] School of Environmental Science & Engineering, Tianjin University, Tianjin

[2] Tianjin Eco-Environmental Monitoring Center, Tianjin

来源：

Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 08期

关键词：

Concentration levels; Ozone (O[!sub]3[!/sub]); Pollution characterization; Source apportionment; Volatile organic compounds (VOCs);

D O I：

10.13227/j.hjkx.202101129

中图分类号：

学科分类号：

摘要：

To further study the effect of volatile organic compounds (VOCs) on ozone pollution, the characteristics and sources of VOCs at different ozone (O3) concentration levels were analyzed, using high-resolution online monitoring data obtained from Tianjin in the summer of 2019. Results showed that VOCs concentrations were 32.94, 38.10, 42.41, and 47.12 μg•m-3, when the O3 concentration levels were categorized as excellent, good, light pollution, and moderate pollution, respectively. VOCs were composed of alkanes, alkenes, alkynes and aromatics, which accounted for 61.72%- 63.36%, 14.96%- 15.51%, 2.73%- 4.13%, and 18.53%- 19.10%, respectively, of VOCs concentrations at different O3 concentration levels. Among them, the proportion of alkanes was slightly higher when O3 concentration was categorized as good or light pollution, alkenes and alkynes accounted for the highest proportion when O3 concentration was excellent, and the proportion of aromatics was highest during periods of moderate pollution. The main VOCs species were propane, ethane, ethylene, toluent, n-butane, isopentane, m/p-xylene, propylene, acetylene, n-hexane, isobutene, benzene, n-pentane, isoprene, and 1,2,3-trimethylbenzene. The concentration percentage of isopentane, n-pentane, benzene, ethylene, propylene, n-butane, and isobutane increased gradually as O3 concentration increased. Significant increases in isoprene and 1,2,3-trimethylbenzene were observed during periods of light and moderate pollution. Alkenes and aromatics had higher ozone formation potential (OFP), and the contribution of alkenes to OFP declined as the O3 level rose, whereas that of aromatics increased. Ethylene, propylene, m/p-xylene, 1,2,3-trimethylbenzene, toluene, isoprene, trans- 2-butene, and cis- 2-pentene were the key species for O3 generation, and the contribution ratio of 1,2,3-trimethylbenzene, isoprene, propylene, and ethylene to OFP increased significantly during light or moderate O3 pollution. Positive matrix factorization was applied to estimate the source contributions of VOCs. Automobile exhaust, solvent usage, liquefied petroleum gas (LPG)/gasoline evaporation, combustion, petrochemical industrial emissions, natural sources, and other industrial emissions were identified as major sources of VOCs in summer. As O3 concentration level rose, the contribution percentage of automobile exhaust, LPG/gasoline evaporation, petrochemical industrial emissions, and natural sources increased gradually, whereas the contribution of combustion and other industrial emissions decreased overall. The contribution of solvent usage was lower when O3 levels indicated light or moderate pollution than when it was good. © 2021, Science Press. All right reserved.

引用

页码：3585 / 3594

页数：9

共 48 条

[1] Li H, Peng L, Bi F, Et al., Strategy of coordinated control of PM<sub>2.5</sub> and ozone in China, Research of Environmental Sciences, 32, 10, pp. 1763-1778, (2019)
[2] Tsai W Y, Chan L Y, Blake D R, Et al., Vehicular fuel composition and atmospheric emissions in south China: Hong Kong, Macau, Guangzhou, and Zhuhai, Atmospheric Chemistry and Physics, 6, 11, pp. 3281-3288, (2006)
[3] Wang T, Xue L K, Brimblecombe P, Et al., Ozone pollution in China: a review of concentrations, meteorological influences, chemical precursors, and effects, Science of the Total Environment, 575, pp. 1582-1596, (2017)
[4] Xu W Y, Kuang Y, Bian Y X, Et al., Current challenges in visibility improvement in southern China, Environmental Science & Technology Letters, 7, 6, pp. 395-401, (2020)
[5] Huang C, Chen C H, Li L, Et al., The study of emission inventory on anthropogenic air pollutants and VOC species in the Yangtze River Delta region, China, Atmospheric Chemistry and Physics Discussions, 11, 1, pp. 951-983, (2011)
[6] Wang H L, Gao Y Q, Jing S A, Et al., Characterization of volatile organic compounds (VOCs) using mobile monitoring around the industrial parks in the Yangzte River delta region of China, Environmental Science, 42, 3, pp. 1298-1305, (2021)
[7] Wang H L., Characterization of volatile organic compounds (VOCs) and the impact on ozone formation during the photochemical smog episode in Shanghai, China, Acta Scientiae Circumstantiae, 35, 6, pp. 1603-1611, (2015)
[8] Wang Q., Chemical characteristics and sources of volatile organic compounds in Shanghai during an ozone and particulate pollution episode in May 2019, Environmental Science, 41, 6, pp. 2555-2564, (2020)
[9] Jing S A, Ye X H, Gao Y Q, Et al., Characteristics and reactivity of VOCs in Hangzhou during a typical photochemical pollution episode, Environmental Science, 41, 7, pp. 3076-3084, (2020)
[10] Lin X, Chen C, Ye H, Et al., Variation characteristics and chemical reactivity of VOCs in different functional zones of Hangzhou in autumn, Environmental Monitoring in China, 36, 2, pp. 196-204, (2020)

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