Abstract
As a class of persistent organic pollutants, polycyclic aromatic hydrocarbons (PAHs) are widely present and accumulate in multimedia environments. The pollution characteristics, spatiotemporal distribution, potential sources, influencing factors, and ecological risks of 16 PAHs were investigated in the water–sediment system of the Hangzhou Bay and outer bay area (HZB and OBA, respectively). The total concentrations of 16 PAHs (∑PAHs) were 220 ± 97.0 and 130 ± 36.0 ng/L in the seawater and 343 ± 179 and 505 ± 415 μg/kg (dry weight) in the sediments of the HZB and OBA, respectively. The pollution level of PAHs in the HZB seawater was higher than that in the OBA seawater, but the opposite result was found in the sediments. Moreover, ∑PAHs exhibited high temporal variability in the HZB seawater (rainy season > dry season), whereas ∑PAHs in the sediments showed no significant difference between seasons. The molecular diagnostic ratio method was used to identify pollution sources and showed that the PAHs in seawater came from different pollution sources (fuel combustion and petroleum), whereas the PAHs in the sediments originated from coincident sources (mixed combustion). Correlation analysis revealed that temperature was positively related to ∑PAHs, whereas salinity was negatively related to seawater ∑PAHs values. Ecological risk assessment demonstrated that the potential for adverse ecological effects was low to moderate in seawater but moderate to high in the sediments.
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Data availability
The datasets used in the study are available from the corresponding author on reasonable request.
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We are grateful to the boatman “Zhe Lu Yu Gong 99001” for their support during the sampling campaign.
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This work was supported by the Key Research and Development Program of Zhejiang Province (2022C02028), the Natural Science Foundation of Zhejiang Province (LQ21D060003), Ningbo Science and Technology Bureau (2021S065, 2022J079), Major Scientific and Technological Project of Ningbo (2021Z102).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Yu-Yao Wu, Ze-Ming Zhang, Rong-Rong Zhang, and Ai-Li Sun. The first draft of the manuscript was written by Yu-Yao Wu, and revised it critically for important intellectual content by Ze-Ming Zhang, Huang Wei, and Xi-Zhi Shi. The manuscript was approved the version to be published by Ai-Li Sun, Jiong Chen, and Xi-Zhi Shi. All authors commented on previous versions of the manuscript, and Ai-Li Sun and Xi-Zhi Shi agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. All authors read and approved the final manuscript.
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Wu, Y., Zhang, Z., Huang, W. et al. Environmental profile, potential sources, and ecological risk of polycyclic aromatic hydrocarbons in a typical coastal bay and outer bay area. Environ Sci Pollut Res 30, 77757–77770 (2023). https://doi.org/10.1007/s11356-023-27885-3
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DOI: https://doi.org/10.1007/s11356-023-27885-3