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《Ocean Development and Management》 2019-06
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Comparison of Heavy Metal Distribution and Potential Ecological Risk Assessment in the Inner and Outer Seas of Daya Bay

ZHANG Haijuan;CHEN Yuanyuan;China Offshore Environmental Service Ltd.;  
In order to promote the marine ecological environment protection and sustainable development in Daya Bay,the paper evaluated the pollution level of heavy metals of Daya Bay,by the single factor index and Nemero comprehensive pollution index,using 9 heavy metals such as copper as indicators to investigate the seawater,surface sediments and organism of the inner and outer sea of Daya Bay,according to relevant norms and standards,which is innovative.The paper also evaluated the potential ecological risk in the Daya Bay,based on surface sediments,and the potential ecological risk index.Research indicated:Most of the heavy metals in seawater,surface sediments and organism of Daya Bay meet the first level standard or recommended standards.The main heavy metal in seawater is lead,and the comprehensive pollution index is lower than the bay outside the bay,which may be related to human activities and seawater exchange.The main heavy metal in the surface sediment is vanadium,and the comprehensive pollution index is lower than the bay in the bay,which may be related to the maximum value of vanadium exceeding the standard.The comprehensive pollution index of heavy metals in the crustaceans and cephalopods which are outside the bay are lower than that inner the bay,while the comprehensive pollution index of heavy metals in the fish and shellfish which are inside the bay are lower than that outside the bay,but the gap is not obvious.The potential ecological risk level of most heavy metals in Daya Bay is very high,and mercury is the primary potential ecological risk factor,which must be highly concerned.
【CateGory Index】: X55;X826
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