北部湾涠洲岛珊瑚礁区多环芳烃污染特征研究

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Abstract The 15 polycyclic aromatic hydrocarbons (PAHs) that were prioritized by US EPA (excluding naphthalene) were investigated in ambient seawater, sediments, and corals from the coral reef regions (CRRs) of Weizhou Island, Beibu Gulf. The results show that these PAHs widely presented in the seawater, sediments, and corals. All of them were dominated by 3-rings PAHs (68.47%~85.62%). The total concentration of 15PAHs (∑₁₅PAHs) was relatively higher in the seawater ((2004.49±946.22) ng/L), coral tissues ((2488.58±1375.33) ng/g), and symbiotic zooxanthellae ((2496.76±979.26) ng/g), while lower in the sediment ((61.38±37.41) ng/g). Compared with the seawater and coral tissues in October 2015, the PAHs’ levels were significantly higher in this survey. The negative relationship between ∑₁₅PAHs and chlorophyll-a concentration ((2.14±1.92) mg/L) in coral symbiotic zooxanthellae was significant (P<0.05), indicating that the biomass dilution had a crucial effect on the ∑₁₅PAHs in coral symbiotic zooxanthellae, i.e., the rapid propagation and growth of coral symbiotic zooxanthellae would lead to the increase in chlorophyll-a concentration and the decrease in ∑₁₅PAHs. The most of the 3-rings and 4-rings PAHs in the seawater from Weizhou Island CRRs were already at the medium-high ecological risk to marine organisms, while fluorene (FLU), phenanthrene (PHE), and pyrene (PYR) in the sediment reached the moderate ecological risk to marine organisms. Further studies on the toxic effects of PAHs on coral symbiotic zooxanthellae are needed. Finally, the source apportionment indicates that the PAHs in the seawater were mainly from spilled oil and coal and biomass combustion, and the PAHs in sediment were mainly from spilled oil and fossil fuels combustion.

Key words： corals polycyclic aromatic hydrocarbons (PAHs) bioaccumulation risk assessment source apportionment

Received: 06 September 2022

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	SHI Jing-wen
	ZHANG Rui-jie
	HAN Min-wei
	WANG Yu-xuan
	WANG Chen-yan
	LI Hao-lan
	KANG Ya-ru
	LIU Fang
	QIN Su-li
	YU Ke-fu

Cite this article:

SHI Jing-wen,ZHANG Rui-jie,HAN Min-wei等. Pollution characteristics of polycyclic aromatic hydrocarbons in the coral reef regions of Weizhou Island, Beibu Gulf[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(4): 1802-1811.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I4/1802

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