浙江典型海湾潮间带沉积物污染及生态风险评价

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Abstract

This study investigated the pollution characteristics of heavy metals (Cu, Zn, Pb, Cr, Cd, Hg, As) and polychlorinated biphenyls (PCB) in sediments across 4 typical intertidal zone areas in Zhejiang province and discussed the distribution, the potential ecological risks and their sources. The results showed that the contents of Cd, Hg, As, and PCB in surface sediments reached China's national first-class benchmark of marine sediment quality. The 42% of Cu, 9% of Zn, 3% of Pb, and 12% of Cr samples reached the China's national second-class benchmark. Only 1% of Cu and Zn samples dropped the China's national third-class benchmark. The integrated pollution degrees followed the order Yueqing Bay > Sanmen Bay > Xiangshan Bay > Hangzhou Bay, with a moderate pollution level in Yueqing Bay, and no pollution in other bays. The comprehensive potential ecological risks followed the order Yueqing Bay > Hangzhou Bay > Sanmen Bay > Xiangshan Bay, with a moderate risk level in Yueqing Bay and Hangzhou Bay, and a low risk level in Sanmen Bay and Xiangshan Bay. Cd was the primary potential ecological risk factor, who contributed for the potential ecological risk index (RI) by 63%, 54%, 58%, and 55% in Hangzhou Bay, Xiangshan Bay, Sanmen Bay, and Yueqing Bay, respectively. Domestic wastewater, agriculture, industrial production, and transportation were the main sources of heavy metals and PCB pollutions.

Key words： sediment heavy metals polychlorinated biphenyls intertidal zone ecological risk

Received: 12 September 2019

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X55

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	Articles by authors
	CHEN Si-yang
	SONG Li-li
	LIU Xi-zhen
	LIU Rui-juan
	YU Jun

Cite this article:

CHEN Si-yang,SONG Li-li,LIU Xi-zhen等. Evaluation on sediment pollution and potential ecological risks in the intertidal zone of typical bays in Zhejiang Province[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(4): 1771-1781.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I4/1771

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