Diurnal Variations and Source Analysis of Water-soluble Compounds in PM2.5 During the Winter in Liaocheng City

被引：1
|
作者：
Yi Y.-N. [1 ]
Hou Z.-F. [1 ,2 ]
Meng J.-J. [1 ,2 ]
Yan L. [3 ]
Wang X.-P. [4 ]
Liu X.-D. [1 ]
Fu M.-X. [1 ]
Wei B.-J. [1 ]
机构：
[1] School of Environment and Planning, Liaocheng University, Liaocheng
[2] State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an
[3] Chinese Academy for Environmental Planning, Beijing
[4] Key Laboratory of Geographic Information Science, School of Geographic Sciences, East China Normal University, Shanghai
来源：
Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 10期
关键词：
Inorganic ions; Levoglucosan; Liaocheng City; Oxalic acid; PM[!sub]2.5[!/sub;
D O I：
10.13227/j.hjkx.201903039
中图分类号：
学科分类号：
摘要：
To investigate the diurnal variations and sources of water-soluble compounds in Liaocheng City, PM2.5 samples were collected between January and February 2017. The PM2.5 samples were analyzed for the compositions, concentrations, and sources of water-soluble inorganic ions, oxalic acid, and levoglucosan. The sources of these chemical compound were investigated using principal component analysis (PCA) and multiple linear regression (MLR) modeling. The results showed that the mass concentrations of PM2.5during the nighttime were higher than those during the daytime, and the average concentrations exceeded the National Ambient Air Quality Standard (GB 3095-2012) by more than 1.8 times. Moreover, atmospheric pollution was worse during the day than during the night. SNA (SO4 2-, NO3 -, and NH4 +) were the dominant species among the inorganic ions, the relative abundance of which with respect to the total concentrations of inorganic ions was 73.4% and 77.1% during the daytime and nighttime, respectively. The ratios of anion to cation equivalents (AE/CE) were less than one, suggesting that the PM2.5was slightly alkaline, and the degree of acidity at night was stronger than during the day. The results of the correlation analyses suggested that aqueous-phase oxidation was the major formation pathway of oxalic acid, which is driven by acid-catalyzed oxidation. The oxalic acid was mainly influenced by biomass burning during the winter in Liaocheng City. The results of the PCA-MLR model suggested that water-soluble compounds in Liaocheng City were mostly from vehicular emissions and secondary oxidation, biomass burning, while the impacts of mineral dust and coal burning were relatively minor. © 2019, Science Press. All right reserved.
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页码：4319 / 4329
页数：10
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