« Previous AbstractAmbient PM(2.5) and Related Health Impacts of Spontaneous Combustion of Coal and Coal Gangue    Next Abstract[Emissions Inventory of Smoldering Chinese Kangs and Their Contribution to PM(2.5) Pollution in Lanzhou City] »

Sci Total Environ

Title:		"Chemical reactivity of volatile organic compounds and their effects on ozone formation in a petrochemical industrial area of Lanzhou, Western China"
Author(s):		Guo W; Yang Y; Chen Q; Zhu Y; Zhang Y; Zhang Y; Liu Y; Li G; Sun W; She J;
Address:		"Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China. Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China; Northwest Institute of Eco-environmental Resources, Chinese Academy of Sciences, Lanzhou 730000, China; Gansu Environmental Monitoring Center, Lanzhou 730000, China. Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China. Electronic address: chenqqh@lzu.edu.cn. Environment Research Institute, Shandong University, Jinan 250000, China"
Journal Title:		Sci Total Environ
Year:		2022
Volume:		20220512
Issue:
Page Number:		155901 -
DOI:		10.1016/j.scitotenv.2022.155901
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Measurements of ozone (O(3)) and its precursors were performed in the summer of 2019 in Lanzhou, a petrochemical industrial city, to better understand the reactivity of volatile organic compounds (VOCs) and their effects on O(3) production. During the campaign, the daily maximum 8-hour average (MDA8) O(3), NO(2), and total VOC (TVOC) concentrations reached 72.2 +/- 19.9 ppb, 24.9 +/- 10.8 ppb, and 50.8 +/- 46.1 ppb, respectively. Alkanes, alkenes, halocarbons, aromatics, and alkynes contributed 45.3%, 24.0%, 16.5%, 10.0%, and 4.2% to TVOCs, respectively. The OH reactivity and relative incremental reactivity (RIR) of VOCs at different times were calculated. The results indicated that alkenes played a predominant role, accounting for an average of 68.5% of the initial VOC reactivity. Compared to other regions, alkenes are relatively more important for O(3) formation in the petrochemical industry area of Lanzhou, while aromatics are relatively less important. Generally, O(3) formation occurred in a VOC-limited regime in the morning and in a transitional regime in the afternoon. The response surface methodology (RSM) combined with a chemical box model was applied to obtain relationships between O(3) and its precursors and determine the most effective way to reduce the O(3) concentration. Reduction in the non-alkene concentration slightly affected the O(3) concentration. In contrast, the effect of nitrogen oxides (NO(x)) was closely related to the alkene concentration, and NO(x) concentration reduction could lead to an increase in the O(3) concentration when alkenes were abated to less than 80% of the present concentration. To mitigate O(3) pollution near the petrochemical industrial area of Lanzhou, reducing the alkene concentration, especially the C4 alkene concentration (1,3-butadiene, cis-2-butene, and trans-2-butene), was the fastest and most effective control strategy. The results of this study serve as a reference for O(3) pollution control in petrochemical industrial areas"
Keywords:		*Air Pollutants/analysis Alkenes China Environmental Monitoring/methods *Ozone/analysis *Volatile Organic Compounds/analysis Control strategy Incremental reactivity OH reactivity Ozone pollution Petrochemical industry;
Notes:		"MedlineGuo, Wenkai Yang, Yanping Chen, Qiang Zhu, Yuhuan Zhang, Yaru Zhang, Yingnan Liu, Yongle Li, Guangyao Sun, Wei She, Jing eng Netherlands 2022/05/16 Sci Total Environ. 2022 Sep 15; 839:155901. doi: 10.1016/j.scitotenv.2022.155901. Epub 2022 May 12"