Summer Pollution Characteristics and Sources of Volatile Organic Compounds in Lanzhou

被引：0
|
作者：
Yang Y.-P. [1 ,2 ,3 ,4 ]
Chen Q. [1 ]
Meng X.-H. [2 ,3 ]
Sun J. [4 ]
Wang L.-N. [4 ]
Tao H.-J. [4 ]
Yang L.-L. [1 ,4 ]
机构：
[1] Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gansu Province, College of Atmospheric Sciences, Lanzhou University, Lanzhou
[2] Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou
[3] University of Chinese Academy of Sciences, Beijing
[4] Gansu Environmental Monitoring Center, Lanzhou
来源：
Huanjing Kexue/Environmental Science | 2022年 / 43卷 / 12期
关键词：
Lanzhou; pollution characteristics; positive matrix factorization(PMF); source analysis; volatile organic compounds(VOCs);
D O I：
10.13227/j.hjkx.202201281
中图分类号：
学科分类号：
摘要：
In order to study characteristics and sources of atmospheric volatile organic compound (VOCs) pollution in Lanzhou in summer, the real-time online monitoring instrument TH-300B (GC-MS/FID) was used to carry out a one-month comprehensive observation in July 2021. The results showed that the concentration of total volatile organic compounds ρ(TVOCs) was 99. 77 μg·m- 3 during the monitoring period, with alkanes comprising the largest proportion, followed by aromatic hydrocarbons and oxygen-containing volatile organic compounds (OVOCs), and the proportion of alkynes and halogenated hydrocarbons was relatively small. The concentration of each component showed a diurnal variation characteristic of being high in the morning and evening and low at noon. The contribution rate of the top ten VOCs to ozone formation potential (OFP) reached 57. 3%, and the contribution rate of the top ten substances in the generation potential of secondary organic aerosol (SOA) accounted for 93. 10%, mainly including aromatic hydrocarbons and high-carbon alkanes. Among them, toluene, m/p-xylene OFP, and SOA contributed the most. Positive matrix factorization (PMF) was used to analyze the pollution sources. The results showed that industrial solvent sources (22. 25%), paint and coatings sources (21. 70%), and motor vehicle exhaust sources (16. 25%) were the main sources of VOCs in the ambient air of the study area. Based on the pollution source emission inventory method, VOCs emissions in 2017 were 94 761. 6 t in Lanzhou, mainly from solvent emission and mobile sources, with contribution rates of 56. 70% and 18. 03%, respectively. Therefore, to solve the complex atmospheric pollution problem in Lanzhou and realize the coordinated control of O3 and PM2.5, industrial solvent emission and motor vehicle control should be given priority, and focus should be on reducing the emission of toluene, m/p-xylene, and other aromatic hydrocarbons in VOCs. © 2022 Science Press. All rights reserved.
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页码：5442 / 5452
页数：10
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