Heavy metal pollution status in surface sediments
of the coastal Bohai Bay
Bohai Bay, the second largest bay of Bohai Sea, largely due to the huge amount of pollutants
discharged into it annually and its geohydrologic condition, is considered to be one of
the most polluted marine areas in China. To slow down, halt and finally reverse the
environmental deterioration of Bohai Sea, some researchers have proposed to connect it
with Jiaozhou Bay in the western coast of Southern Yellow Sea by digging an interbasin
canal through Shandong Peninsula. In order to assess the heavy metal pollution and
provide background information for such a large geoengineering scheme, surface sediments
from 42 stations covering both riverine and marine regions of the northwestern
coast of Bohai Bay were analyzed for heavy metal content and fractionation (Cd, Cr, Cu, Ni,
Pb and Zn). Three empirically derived sediment quality guidelines were used to assess the
pollution extent of these metals. The studied metals had low mobility except for Cd at all
stations and Zn at some riverine stations. Although a high mobility of Cd was observed, it
could hardly cause a bad effect on the environment owing to its low total concentrations.
Anthropogenic influence on the accumulation of studied heavy metals in sediments of
Bohai Bay was obvious, but their contents were relatively lower to date comparing with
some other marine coastal areas that receive important anthropogenic inputs. Taking as
a whole, surface sediments of northwestern Bohai Bay had a 21% probability of toxicity
based on the mean effects range-median quotient.
Heavy metal pollution status in surface sedimentsof the coastal Bohai BayBohai Bay, the second largest bay of Bohai Sea, largely due to the huge amount of pollutantsdischarged into it annually and its geohydrologic condition, is considered to be one ofthe most polluted marine areas in China. To slow down, halt and finally reverse theenvironmental deterioration of Bohai Sea, some researchers have proposed to connect itwith Jiaozhou Bay in the western coast of Southern Yellow Sea by digging an interbasincanal through Shandong Peninsula. In order to assess the heavy metal pollution andprovide background information for such a large geoengineering scheme, surface sedimentsfrom 42 stations covering both riverine and marine regions of the northwesterncoast of Bohai Bay were analyzed for heavy metal content and fractionation (Cd, Cr, Cu, Ni,Pb and Zn). Three empirically derived sediment quality guidelines were used to assess thepollution extent of these metals. The studied metals had low mobility except for Cd at allstations and Zn at some riverine stations. Although a high mobility of Cd was observed, itcould hardly cause a bad effect on the environment owing to its low total concentrations.Anthropogenic influence on the accumulation of studied heavy metals in sediments ofBohai Bay was obvious, but their contents were relatively lower to date comparing withsome other marine coastal areas that receive important anthropogenic inputs. Taking asa whole, surface sediments of northwestern Bohai Bay had a 21% probability of toxicitybased on the mean effects range-median quotient.
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