盐城新洋港表层沉积物重金属分布特征与评价

分析了江苏盐城新洋港河口表层沉积物中的Cr、Ni、Cu、Zn、Cd、Pb共6种重金属元素的含量。研究发现,除Zn和Cd外,其它元素的含量均超过江苏省海岸带的背景值,其中全Cr、Pb、Cu的含量均超国家I类标准,属Ⅰ类沉积物。文章分别使用内梅罗综合污染指数法、Hakanson潜在生态危害指数法和污染负荷指数法对数据进行了分析,研究结果发现内梅罗综合污染指数法得出Cr对环境污染的贡献最大;Hakanson潜在生态危害指数法认为潜在生态风险整体呈现向海不断减小的趋势,并以有植被覆盖的互花米草滩为最高。污染负荷指数法与Hakanson潜在生态危害指数法的评价结果一致。从线状分布看,6种重金属的综合含量整体呈沿向海方向减小趋势,互花米草滩明显高于无植被覆盖的光滩。

Distribution Characteristics and Assessment of Heavy Metals in Surface Sediments along Xinyanggang Estuary in Yancheng

The paper analyzed the concentrations of heavy metals in the surface sediments of Xinyanggang Estuary,Yancheng,Jiangsu province,including Cr,Ni,Cu,Zu,Cd,Pb.Results showed that the measured heavy metals＇ concentrations,except Zn and Cd,all exceeded the background values of the coastal zone in Jiangsu Province,and Cr,Pb,Cu belonged to I class sediments according to National Standard.Nemerow Integrated Pollution Index （NIPI）,Hakanson Potential Ecological Risk Index （HPERI） and Pollution Load Index （PLI） were used to analyze the pollution status in this area.Cr contributed much to the pollution status based on NIPI method.Spartina marsh was mostly polluted than other areas and the muddy flats was less polluted according to HPERI method,which was consistent with the result of PLI method.Based on linear distribution,concentration of heavy metals showed decreasing trend to the sea,and Spartina marsh was mostly polluted than other areas without plants.