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Spatial and seasonal variation and sources of deposition fluxes of polycyclic aromatic hydrocarbons (PAHs) in Shanghai

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Abstract

Spatial and temporal variations of polycyclic aromatic hydrocarbons (PAHs) deposition fluxes and sources may significantly facilitate risk evaluation and pollution control of super megacity in China. A study on PAHs of wet and dry deposition in Shanghai was conducted from January to December of 2019. Seventeen sampling sites located in four functional areas were set, including the Baoshan iron and steel industry area (BS), Jinshan petrochemical industry area (JS), city center (CC), and Chongming agricultural area (CM). A total of 15 PAHs were determined by gas chromatography-mass spectrometry (GC–MS, Agilent 7890A/5975C). PAHs atmospheric deposition flux in winter was highest (3.12 ± 1.98 μg/(m2·day), mostly attributed to local emissions accumulation under adverse meteorological diffusion conditions, as well as pollutants transport from northern China during heating season. PAHs deposition fluxes in industrial area (BS and JS) were 3.75 ± 4.08 μg/(m2·day) and 3.18 ± 3.62 μg/(m2·day) respectively, which were greater than those in CC and CM, accounting for 1.91 ± 1.06 μg/(m2·day) and 1.41 ± 0.61 μg/(m2·day) respectively. Proportional composition and isomer ratios of PAHs indicated that the PAHs deposition in winter and spring samples were more homogeneous, whereas those of summer and autumn seemed to be more variable and dispersed. Positive matrix factorization model were employed to identify the potential sources of PAHs in specific functional areas. A dominance of contribution was attributed to coal combustion (46%) at BS, petroleum volatilization (48%) at JS, biomass burning (55%) at CM, and vehicle emission (49%) at CC. This study highlighted that local urbanization and industrialization have a significant contribution to PAHs deposition to specific functional regions in Shanghai.

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source contributions to PAHs at 4 functional areas

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All data generated or analyzed during this study are included in this published article.

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Funding

This study was supported by funding from the Natural Science Foundation of China (No. 51679141), Science and Technology Commission Foundation of Shanghai (No. 19ZR1444100).

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S.H., C.S., and J.W. conceived and designed the experiments. C.S. and J.W. performed the experiments. J.T. and Z.X. analyzed the data. S.H. and C.S. wrote the manuscript, and other authors provided editorial advice, all authors reviewed the manuscript.

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Correspondence to Shenfa Huang.

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The authors declare no competing interests.

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Responsible Editor: Constantini Samara

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Wu, J., Sha, C., Li, D. et al. Spatial and seasonal variation and sources of deposition fluxes of polycyclic aromatic hydrocarbons (PAHs) in Shanghai. Environ Sci Pollut Res 29, 75258–75270 (2022). https://doi.org/10.1007/s11356-022-20348-1

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  • DOI: https://doi.org/10.1007/s11356-022-20348-1

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