title: [Study on heavy metal contaminations and the sources of Pb pollution in Jinghai Bay using the stable isotope technique].
abstract: The concentrations of typical heavy metals including Cu, Hg, Pb, Zn, Mn, Cd, Cr and As in the surface sediment and suspended particulate matter (SPM) in Jinghai Bay, Rongcheng city were tested. The degree of heavy metal pollution in the surface sediment was assessed according to the national standard of marine sediment quality. The potential ecological risk (PER) of heavy metals to marine ecosystem in Jinghai Bay was assessed using PER coefficient and risk index. The results showed that the levels of heavy metals and PER in the surface sediments were low enough to meet the requirement of the first class of the sediment quality standards except the levels of Cu and Zn in the sampling site S2 and Cd in S3, S4, S5 and S6 which met the requirements of the second class of the sediment quality standards. The PER coefficients of heavy metals increased following the sequence of Zn < Cr < Pb < Cu < As <Hg < Cd. The levels of heavy metals in surface sediment and SPM were the highest at S2 and gradually declined with the increasing distance between the sampling sites and the shoreline. The correlation analysis of the loss on ignition (LOI) and the levels of heavy metals showed that LOI was positively correlated to the levels of Cu, Cr, Pb, Zn, Mn, Hg and As in surface sediment. Stable isotope technique was used to trace the dominant sources of Pb contamination in surface sediments and SPM. The results showed that the ratios of 208Ph/204Pb, 207Pb/204Pb, 206Pb/204Pb and 206pb/207pb in surface sediment were more closely related to that of SPM. The ratio of 206pb/207Pb for both surface sediment and SPM was the lowest at the sampling site S2 and negatively correlated to the Pb concentration. The comparisons of Pb stable isotope ratio between the isotope ratios of natural and anthropogenic source showed that the Pb contamination was mainly derived from the human activities such as industrial discharges and leaded gasoline.
authors.affiliation: Key Laboratory of Mariculture, Ministry of Education, Ocean University of China, Qingdao 266003, China. xulinbo-6@163.com
authors.forename: Lin-Bo
authors.initials: LB
authors.lastname: Xu
authors.forename: Qin-Feng
authors.initials: QF
authors.lastname: Gao
authors.forename: Shuang-Lin
authors.initials: SL
authors.lastname: Dong
authors.forename: Jia
authors.initials: J
authors.lastname: Liu
authors.forename: Xiu-Juan
authors.initials: XJ
authors.lastname: Fu
mesh_terms: D061006:Bays; D002681:China; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry; D007553:Isotope Labeling / Q000379:methods*; D007854:Lead / Q000032:analysis*; D007856:Lead Radioisotopes / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D007856:Lead Radioisotopes; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D007854:Lead