Spatial distribution and accumulation of heavy metals in tidal flat sediments of Shanghai coastal zone |
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Authors: | CHEN Zhenlou LIU Peifang XU ShiyuanLIU Lin YU Jia& YU Lizhong State Key Laboratory for Estuarine Coastal Sediment Dynamics Morphodynamics East China Normal University Shanghai China |
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Affiliation: | CHEN Zhenlou,LIU Peifang,XU ShiyuanLIU Lin,YU Jia& YU Lizhong State Key Laboratory for Estuarine and Coastal Sediment Dynamics and Morphodynamics,East China Normal University,Shanghai 200062,China |
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Abstract: | Surface and core sediments from the high, middle and low tidal flats of Shanghai coastal zone were analyzed for heavy metal (e.g. Cu, Pb, Zn, Cr, Cd, Fe, Mn) concentrations. Besides Cd, the concentrations of Cu, Zn, Cr and Pb are 2-5 times higher than their background values and show serious pollution trend due to the direct discharge of industrial and municipal sewage along the Shanghai tidal flat, as well as the wet and dry depositions of industrial dusts. It seems that heavy metals prefer to accumulate and be enriched in the sediments near large sewage outlets, high flats, and the subsurface layer at the depth of 10-30 cm. Several main factors, which include the direct sewage discharge along the tidal flat, tidal hydrodynamic action, large engineering activity, early diagenesis and windstorm tide, are considered to be responsible for influencing spatial distribution patterns of heavy metals in the Shanghai tidal flat. |
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Keywords: | Shanghai coastal zone tidal flat sediments heavy metals spatial distribution spatial accumulation. |
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