Temporal trends of heavy metals in the sediments of Bohai Bay in China

Land reclamation can significantly influence spatial distribution of heavy metals in inshore sediments. In this study, the distribution and contamination of heavy metals (Cd, Cr, Cu, Ni, Pb, and Zn) in inshore sediments of Bohai Bay were investigated after the land reclamation of Caofeidian. The results showed that the concentrations of Cd, Cr, Cu, Ni, Pb, and Zn in the sediments were 0.20–0.65, 27.16–115.70, 11.14–39.00, 17.37–65.90, 15.08–24.06, and 41.64–139.56 mg/kg, respectively. These metal concentrations were generally higher in the area of Caofeidian than in other Chinese bays and estuaries. Spatially, the concentrations of Cd, Cr, Cu, Ni, and Zn were markedly lower in the sediments close to Caofeidian compared with other regions, whereas the concentrations of Pb showed an opposite case. Hydrodynamic conditions after the land reclamation were the major factor influencing the distribution of heavy metals in the sediments. Grain sizes dominated the distribution of Cu and Zn, and organic matters and Fe/Mn oxides/hydroxides also determined the distribution of the heavy metals. Multiple contamination indices showed that the inshore sediments were moderately to highly contaminated by Cd and slightly contaminated by other heavy metals. Similarly, Cd showed a high potential ecorisk in the sediments, and other metals were in the low level. Chromium contributed to higher exposure toxicity than other metals by the toxicity unit and toxic risk index. The results of this study indicate that after the land reclamation of Caofeidian the contamination and ecorisk of heavy metals in the sediments markedly decreased in the stronger hydrodynamic areas.

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Evaluation and Content of Various Heavy Metals Found in the Fish (Chaeturichthys Stigmatias Richardson) Collected from the Oil Spill Area of Bohai Bay (China) during the Summer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.955-959.1448 ◽

2014 ◽

Vol 955-959 ◽

pp. 1448-1451

Author(s):

Hong Wei Wang ◽

Na Zhu ◽

Duan Bo Cai ◽

Yong Fang Wang ◽

Yu Wei Liu ◽

...

Keyword(s):

Heavy Metals ◽

Heavy Metal ◽

Oil Spill ◽

Metal Content ◽

Fish Tissue ◽

Heavy Metal Content ◽

Bohai Bay

The heavy metal content in fish (Chaeturichthys stigmatias Richardson) tissue in the oil spill area of Bohai Bay had been evaluated though the determination results, the distribution and variation difference of the heavy metal content in fish tissue had been discussed The fish of each sample stations were not polluted by heavy metals.

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Heavy Metals Pollution and Pb Isotopic Signatures in Surface Sediments Collected from Bohai Bay, North China

The Scientific World JOURNAL ◽

10.1155/2014/158796 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Bo Gao ◽

Jin Lu ◽

Hong Hao ◽

Shuhua Yin ◽

Xiao Yu ◽

...

Keyword(s):

Heavy Metals ◽

North China ◽

Surface Sediments ◽

Geoaccumulation Index ◽

Pollution Level ◽

Bohai Bay ◽

Isotopic Signatures ◽

Metals Pollution ◽

Heavy Metals Pollution ◽

The Mean

To investigate the characteristics and potential sources of heavy metals pollution, surface sediments collected from Bohai Bay, North China, were analyzed for the selected metals (Cd, Cr, Cu, Ni, Pb, and Zn). The Geoaccumulation Index was used to assess the level of heavy metal pollution. Pb isotopic compositions in sediments were also measured to effectively identify the potential Pb sources. The results showed that the average concentrations of Cd, Cr, Cu, Ni, Pb, and Zn were 0.15, 79.73, 28.70, 36.56, 25.63, and 72.83 mg/kg, respectively. The mean concentrations of the studied metals were slightly higher than the background values. However, the heavy metals concentrations in surface sediments in Bohai Bay were below the other important bays or estuaries in China. The assessment by Geoaccumulation Index indicated that Cr, Zn, and Cd were classified as “the unpolluted” level, while Ni, Cu, and Pb were ranked as “unpolluted to moderately polluted” level. The order of pollution level of heavy metals was:Pb>Ni>Cu>Cr>Zn>Cd. The Pb isotopic ratios in surface sediments varied from 1.159 to 1.185 for206Pb/207Pb and from 2.456 to 2.482 for208Pb/207Pb. Compared with Pb isotopic radios in other sources, Pb contaminations in the surface sediments of Bohai Bay may be controlled by the mix process of coal combustion, aerosol particles deposition, and natural sources.

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