Characteristics of Nitroaromatic Compounds in PM2.5 in Urban Area of Shanghai

被引：0
|
作者：
Zhuang M. [1 ]
Ma Y.-G. [2 ]
Cheng Y.-H. [3 ]
Zhou M. [2 ]
Dai H.-X. [2 ]
Huang C. [2 ]
Yu J.-Z. [3 ]
Zhu S.-H. [2 ,3 ]
Qiao L.-P. [2 ]
Tong Z.-F. [1 ]
机构：
[1] College of Chemistry and Chemical Engineering, Guangxi University, Nanning
[2] State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, Shanghai
[3] Department of Chemistry, The Hong Kong University of Science and Technology
来源：
Huanjing Kexue/Environmental Science | 2022年 / 43卷 / 04期
关键词：
High performance liquid chromatography; Molecular composition; Nitroaromatic compounds(NACs); Orbitrap mass spectrometry; Seasonal variationj;
D O I：
10.13227/j.hjkx.202106215
中图分类号：
学科分类号：
摘要：
Nitroaromatic compounds (NACs) are an important class of nitrogen-containing compounds in fine particles. The investigation of characteristics and seasonal variation of NACs in PM2.5 increases our knowledge about nitrogen-containing compounds and contributes to the scientific basis in formulating reduction policies of NOx in urban areas. In this study, we analyzed the chemical composition of PM2.5 samples collected from March 2018 to February 2019 in an urban location in Shanghai. A total of 2 439-3 695 organic molecular formulas were detected using UPLC-Orbitrap MS. Nine NACs were quantified using an internal standard method. In spring, ρ(NACs) ranged from 3.12 to 16.76 ng•m-3, and the average concentration was 9.31 ng•m-3. In summer, it ranged from 1.05 to 9.70 ng•m-3, and the average value was 4.16 ng•m-3. In autumn, it ranged from 2.87 to 36.27 ng•m-3, and its average was 9.84 ng•m-3. In winter, it ranged from 4.83 to 56.23 ng•m-3, and the average was 22.37 ng•m-3. 4-Nitrophenol accounted for more than 25% of the quantified NACs in different seasons. In summer, the concentration of 5-nitrosalicylic acid accounted for 36%, but it decreased to 19% in winter. NACs in summer mainly originated from secondary formation, as evidenced by their clear correlation with the oxidant level, whereas biomass burning became the main source of NACs in winter. © 2022, Science Press. All right reserved.
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页码：1725 / 1737
页数：12
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