| Modern lakes are a complex dynamic system interacted by human and natural environments,especially when receiving large amounts of anthropogenic contaminants from nearby urban areas and industrial sites. Among the various contaminants, heavy metals are of particular concern due to their environmental persistence and biogeochemical recycling and ecological risks. Therefore, it is necessary to investigate the content, speciation, adsorption and release of heavy metals in sediment that the place of heavy metals accumulating and the place of heavy metals source in water environment. The result would make a great contribution to understand the heavy metal resources, pollution status and the affection to the ecosystem, and have a great significance to lake environmental protection.The Pollution Character of heavy metals in water-sediment system was for the first time studied combining the distribution character of heavy metals in the overlying water, sediments and pore water from Nanhaizi lake in Baotou city as a whole in this thesis.The relation between the content of organic matter and each speciation of heavy metals in sediment is discussed. At the same time the adsorption and release characteristics of heavy metals with the change of environmental conditions are also studied. The primary fruits from the results are as follows:1.The total content of Cu Pb Zn Cd Hg in the digested overlying water is higher than the pore water. The content of Pb in the digested overlying water is higher than a kite in site B and site E. The content of Mercury is higher than a kite in site E. The total content of Cu Zn in the pore water is higher than a kite in site A . C and E. |
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