LIU Ming, FAN Dejiang, LIAO Yongjie, CHEN Bin, YANG Zuosheng. Heavy metals in surficial sediments of the central Bohai Sea: their distribution, speciation and sources[J]. Acta Oceanologica Sinica, 2016, 35(9): 98-110. doi: 10.1007/s13131-016-0926-6
Citation: LIU Ming, FAN Dejiang, LIAO Yongjie, CHEN Bin, YANG Zuosheng. Heavy metals in surficial sediments of the central Bohai Sea: their distribution, speciation and sources[J]. Acta Oceanologica Sinica, 2016, 35(9): 98-110. doi: 10.1007/s13131-016-0926-6

Heavy metals in surficial sediments of the central Bohai Sea: their distribution, speciation and sources

doi: 10.1007/s13131-016-0926-6
  • Received Date: 2015-04-28
  • Rev Recd Date: 2016-01-13
  • The semi-enclosed Bohai Sea has received large amount of pollutants from surrounding rivers and sewage channels along the densely populated and industrializing Bohai coasts, as well as the offshore oil exploration in the sea. The concentrations of heavy metals copper, cobalt, nickel, zinc, lead, chromium and cadmium in 25 surface sediment samples from the central Bohai Sea are obtained by ICP-MS analysis. The speciation of these heavy metals is extracted and their distribution, fractionation, pollution status and sources are presented. High concentrations of copper, cobalt, nickel, zinc and chromium are found in the sediments off the coastal area of the Bohai Bay and the central Bohai Sea mud, while high concentrations of cadmium and lead are found in the sediments in the whole study area. The residual fraction is the dominant form of copper, cobalt, nickel, zinc and chromium in the surface sediments, while cadmium and lead have large proportions in the nonresidual fractions. The ecological risk assessment shows that the sediments in the study area are unpolluted with respect to the heavy metals of cobalt, nickel and chromium and unpolluted to moderately polluted with respect to copper, zinc, cadmium and lead. Cobalt, nickel and chromium mainly have natural origin and their concentrations significantly vary with the composition of the sediments. The contents of copper, zinc, lead and especially cadmium in sediments are suggested to be influenced by pollutants of human activities. The heavy metals in the surface sediments at most sampling stations are mainly come from the Huanghe River; the heavy metals in the sediments in the northernmost part of the study area are significantly affected by the sediment from the Luanhe River; while in the Bohai Bay and the central region they were affected by the sediment from the Haihe River and aerosol deposition.
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