Temporal and spatial distribution of trace metals in sediments from the northern Yellow Sea coast,China: implications for regional anthropogenic processes |
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Authors: | Email author" target="_blank">Qianli?SunEmail author Dongyan?Liu Tao?Liu Baoping?Di Feng?Wu |
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Institution: | (1) State Key Laboratory for Estuarine and Coastal Research Institute, East China Normal University, Shanghai, 200062, China;(2) Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, 264003, China;(3) Department of Geography, East China Normal University, Shanghai, 200062, China;(4) State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, 710075, China |
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Abstract: | Surface sediment samples from 17 sites in the Yantai coastal area, the northern Yellow Sea, China, combined with a sediment
core were employed for geochemical and chronological analyses for the purpose of characterizing the temporal and spatial distribution
of trace metals in sediments and their implications for anthropogenic processes. The results indicated that the spatial distribution
of trace metals (Cr, Ni, Ti, Pb, As, Zn, Mn and Cu) in surface sediments was significantly contributed by the sewage discharges
along the Yantai coast, and the coastal currents played a major role for transporting the pollutants to offshore. The temporal
concentrations of trace metals in the sediment core based on the chronology determined by a combination of radionuclide 137Cs and 210Pb activity demonstrated that trace metal concentrations increased step-wisely over the last ca. 100 years, corresponding
to the intensity of anthropogenic processes in the Yantai area. The high levels of Cu and As before the late 1970s indicated
the agricultural emission from the application of pesticides. While, all the high-trace metal concentrations since the early
1980s could be seen as diagnostic indictors of increasing industrialization, urbanization and sewage discharge in the Yantai
area. Although the potential ecological risk evaluation of trace metals in the coastal area suggests low-potential ecological
risk at present, some trace metals, such as As and Pb need particular attention due to their slight contamination. |
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