title: [Heavy metals in the surface sediment of the dumping ground outside Jiaozhou Bay and their potential ecological risk].
abstract: Based on the monitoring data of heavy metals (Cr, Hg, Cd, Pb, Zn, Cu) in the surface sediment of the dumping ground outside Jiaozhou Bay from 2003 to 2008, the distribution patterns, factors controlling the distribution, and the potential ecological risks of heavy metals were studied with the data in 2007-08, and the fluctuation trends of heavy metals in the surface sediment over the 6 years were also discussed. The average concentrations of heavy metals Cr, Hg, Cd, Pb, Zn, Cu in the surface sediment were 29.47, 0.065, 0.105, 1.145, 9.63, 3.355 microg/g, respectively. Except for Cr, the concentration of heavy metals was high in the central dumping area while low outside the dumping ground, suggesting that the dredged material dumped was the main source of heavy metals. Organic carbon content in the surface sediment had a significant positive correlation with heavy metals except for Cr. Based on the results of ecological risk assessment, Hg had a medium potential ecological risk, while the other heavy metals had low potential ecological risk. The overall risk index (RI) of the heavy metals was 100.50, which was considered as a level of low potential ecological risk. The average concentration of heavy metals showed a decreasing trend over the 6 years, except Hg. In conclusion, the quality of surface sediment in term of heavy metals in the dumping ground outside Jiaozhou Bay is relatively good.
authors.affiliation: North China Sea Marine Forecasting Center of State Ocean Administration, Qingdao 266033, China. zhangnaix@mails.gucas.ac.cn
authors.forename: Cong-hua
authors.initials: CH
authors.lastname: Cao
authors.forename: Nai-xing
authors.initials: NX
authors.lastname: Zhang
authors.forename: Feng-cong
authors.initials: FC
authors.lastname: Wu
authors.forename: Bin
authors.initials: B
authors.lastname: Sun
authors.forename: Rong-zhu
authors.initials: RZ
authors.lastname: Ren
authors.forename: Xu
authors.initials: X
authors.lastname: Sun
authors.forename: Sen
authors.initials: S
authors.lastname: Lin
authors.forename: Shao-ping
authors.initials: SP
authors.lastname: Zhang
mesh_terms: D002681:China; D004463:Ecology; D004784:Environmental Monitoring / Q000379:methods; D019015:Geologic Sediments / Q000032:analysis*; D019216:Metals, Heavy / Q000032:analysis*; D009792:Oceans and Seas; D018570:Risk Assessment; D012623:Seawater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D019216:Metals, Heavy; D014874:Water Pollutants, Chemical