渤海湾表层沉积物重金属污染状况及年际变化分析

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Abstract The pollution concentration of sediment heavy metals Hg, Cu, Pb, Cd, Cr, Zn and As and their annual variations in Bohai Bay were analysized basing on the monitoring data of the surface sediment samples collected from Bohai Bay during the period from 2014 to 2018. The pollution status and potential ecoloical risk of sediment heavy metals in Bohai Bay was evaluated by the methods of single factor standard index(PI_i), geoaccumulation index(I_geo) and potential ecological risk index(RI). The results show that above 92% of the sampling sites measure up to the first standard of the national marine sedimentary evaluation criterion. The main exceeded standard heavy metals were Cd and Hg, and the distribution area of their higher concentration were in the north and south ends in the bay, especially including Tianjin Port coastal areas, Huanghua Port coastal areas, Binzhou coastal areas and Dongying coastal areas. The sediment quality status of Bohai Bay was well, and the single factor standard index(PI_i) and geoaccumulation index(I_geo) of all heavy metals annual average were less than 1 and 0, respectively. The annual variations of the seven heavy metals were different from each other, Cu the standard index (PI_i) value was higher than the others, the recent five years average standard index(PI_i) of which reached 0.653. Cd the geoaccumulation index(I_geo) was higher than the others, which should be worthy of attention. The potential ecological risk assessment of sediment heavy metals was generally slight in the period from 2014 to 2018. Metals Hg and Cd showed strong and medium ecological risk in the small proportion of stations. The potential ecological risk(RI) order of heavy metals for Bohai Bay was Cd>Hg>As>Pb>Cu>Cr>Zn. An increase-decrease-slightly increase type of RI annual variation was found. The areas of higher ecological risk(RI) were mainly near the coastal areas of Tianjin Port which was in the central part of Bohai Bay, and the Caofeidian coastal areas which was in the northeast of Bohai Bay.

Key words： Bohai bay surface sediments heavy metals annual variation

Received: 08 February 2022

PACS:	X171
	P76

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	XU Yan
	WANG Qiu-lu
	ZENG Rong
	ZHANG Yu-jia
	WANG Xiao-li

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XU Yan,WANG Qiu-lu,ZENG Rong等. Pollution status and annual variations of heavy metals in the surface sediments of Bohai Bay[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4255-4263.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I9/4255

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