Pollution Level and Regional Migration of PCDD/Fs in Ambient Air from Pearl River Delta, China

被引：0
|
作者：
Fu J.-P. [1 ]
Xie D.-P. [1 ]
Huang J.-Q. [1 ]
Yang Y.-Y. [1 ]
Feng G.-X. [1 ]
Zhou C.-F. [1 ]
Liao H.-T. [1 ]
Qing X. [1 ]
Zhang M.-W. [1 ]
Wu M.-L. [1 ]
Zhang S.-K. [1 ]
机构：
[1] South China Institute of Environmental Sciences, Ministry of Ecology and Environment, Guangzhou
来源：
Huanjing Kexue/Environmental Science | 2022年 / 43卷 / 05期
关键词：
Ambient air; Back trajectory; Fingerprint character; PCDD/Fs; Pearl River Delta;
D O I：
10.13227/j.hjkx.202107094
中图分类号：
学科分类号：
摘要：
The current situation of 2, 3, 7, 8-chlorine-substituted PCDD/Fs was examined using high-resolution gas chromatography/high-resolution mass spectrometry (HRGC/HRMS) in winter and summer ambient air from November 2019 to August 2020 around the Pearl River Delta. Further analysis was carried out on the spatial behavior, fingerprint features, indicated monomers, and regional migrations. The results revealed that the mean mass values were 1.40 pg•m-3 and 5.14 pg•m-3, whereas the average toxic equivalent quantities (measured by I-TEQ) were 0.087 pg•m-3 and 0.076 pg•m-3in summer and winter, respectively. Simultaneously, there were differences in the spatial distribution of PCDD/Fs among nine cities between summer and winter, which might have been caused by meteorological conditions and emission sources during the sampling period. OCDD, 1, 2, 3, 4, 6, 7, 8-HpCDD, OCDF, and 1, 2, 3, 4, 6, 7, 8-HpCDF were the major congeners; moreover, 2, 3, 4, 7, 8-PeCDF and 1, 2, 3, 4, 7, 8-HxCDF were the primary toxic contributors, in which the stronger linear correlation indicated a greater contribution. According to the simulated results of back trajectory, air masses influenced by the south-southeast monsoon migrated from the ocean to land and caused the lower mass concentration in summer; simultaneously, the highly contaminated districts were mainly affected by local emission sources. However, the air masses carrying pollutants influenced by the northeast monsoon migrated from Fujian and eastern Guangdong province to the Pearl River Delta, which caused the higher concentration in winter, and external and local emission sources influenced the highly contaminated regions. © 2022, Science Press. All right reserved.
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页码：2355 / 2362
页数：7
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