Abstract
To clarify the impact of human activities on the natural environment, as well as the current ecological risks to the environment surrounding Zhushan Bay in Taihu Lake, the characteristics of deposited organic materials, including elements and 16 polycyclic aromatic hydrocarbons (∑16PAHs), in a sediment core from Taihu Lake were determined. The nitrogen (N), carbon (C), hydrogen (H), and sulfur (S) contents ranged from 0.08 to 0.3%, 0.83 to 3.6%, 0.63 to 1.12%, and 0.02 to 0.24%, respectively. The most abundant element in the core was C followed by H, S, and N, while elemental C and the C/H ratio displayed a decreasing trend with depth. The ∑16PAH concentration was in the range of 1807.48–4674.83 ng g−1, showing a downward trend with depth, with some fluctuations. Three-ring PAHs dominated in surface sediment, while 5-ring PAHs dominated at a depth of 55–93 cm. Six-ring PAHs appeared in the 1830s and gradually increased over time before slowly decreasing from 2005 onward due to the establishment of environmental protection measures. The ratio of PAH monomers indicated that PAHs in samples from a depth of 0 to 55 cm were mainly derived from the combustion of liquid fossil fuels, while the PAHs in the deeper samples mainly originated from petroleum. The results of a principal component analysis (PCA) showed that the PAHs in the sediment core of Taihu Lake were mainly derived from the combustion of fossil fuels, such as diesel, petroleum, gasoline, and coal. The contributions of biomass combustion, liquid fossil fuel combustion, coal combustion, and unknown source were 8.99%, 52.68%, 1.65%, and 36.68%, respectively. The results of a toxicity analysis indicated that most of the PAH monomers had little impact on the ecology, and the annual increase of a small number of monomers might have toxic effects on the biological community, resulting in a serious ecological risks, that requires the imposition of control measures.
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This work was supported by the National Key Research and Development Program of China (2021YFC3201500), the National Natural Science Foundation of China (41673107), and the Major Project of the Jiangsu Provincial Department of Education (20KJA170001).
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All the authors contributed extensively to the work. Xiulu Lang performed the data interpretation and analysis and wrote the original draft. Jiming Tian and Mingli Zhang supported the data collection. Kangkang Yu, Zihan Zhao, and Yan Chen revised the article graphs and proofread the manuscript. Yanhua Wang designed this research and revised the draft of the manuscript.
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Lang, X., Yu, K., Zhao, Z. et al. Vertical distribution, environmental occurrence, and risk assessment of organic pollutants in lacustrine sediments in southeast China. Environ Sci Pollut Res 30, 51206–51216 (2023). https://doi.org/10.1007/s11356-023-25712-3
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DOI: https://doi.org/10.1007/s11356-023-25712-3