长江典型江段水体PAHs的分布特征、来源及其生态风险

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Abstract Sixteen priority polycyclic aromatic hydrocarbons(PAHs) were investigated in water samples (wet, normal and dry periods) in the main stream of the Yangtze River using solid-phase extraction (SPE) -gas chromatography-mass spectrometry (GC-MS) analysis technique. The pollution levels and distribution characteristics of PAHs were studied, the sources and ecological risks of PAHs were evaluated based on quantitative analysis. The results showed that the concentration of Σ₁₆PAHs was from 2.22 to 1450.91ng/L, the average concentrations of ΣPAHs was 107.04ng/L in the Yangtze River, among them, the concentration of Σ₁₆PAHs in the Wuhan river section was the highest during the normal period, with an average value of 1050.64ng/L. Compared with other domestic water bodies in the past five years, the PAHs pollution in the main stream of the Yangtze River was at a moderately low level. In terms of spatial distribution, the Σ₁₆PAHs in surface water of typical sections of the Yangtze River showed a trend of first rising and then falling from the Upstream Panzhihua section to the downstream Nanjing section, The variation trend of Σ₁₆PAHs in temporal distribution: normal period (187.78ng/L)>wet period (73.30ng/L)> dry period (38.02ng/L). The analysis by isomeric ratio method showed that coal, biomass burning and petroleum sources were the main sources of PAHs in the main stream of the Yangtze River in dry and normal periods, In the wet season, PAHs mainly originated from coal and biomass combustion, among them, the sources of PAHs in the Nanjing River section were more complex. The ecological risk assessment of PAHs was carried out using the Species Sensitivity Distributions (SSD) assessment method. The results showed that the PAHs in the surface water of typical sections of the Yangtze River had not yet caused significant negative impacts on aquatic organisms. The comparison of the results with historical data showed that the current ecological risk of PAHs in the main stream of the Yangtze River is lower than the ecological risk before the implementation of the Yangtze River protection policy.

Key words： the main stream of the Yangtze River polycyclic aromatic hydrocarbons ecological risks assessment

Received: 24 April 2022

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X522

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	YANG Meng-ru
	XU Xiong
	WANG Dong-hong
	LIU Quan-zhen
	Lü Jing
	LIN Li-hua
	WANG Dian-chang
	CHEN Yong-bo
	LIANG Wen-yan

Cite this article:

YANG Meng-ru,XU Xiong,WANG Dong-hong等. Distribution characteristics, source and ecological risks assessment of PAHs in water bodies of typical sections of the Yangtze River[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(11): 5308-5317.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I11/5308

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