渤海中部和黄海北部表层沉积物重金属含量及生态风险评价

Contents and Ecological Risk Assessment of Heavy Metals in Surface Sediments of the Central Bohai Sea and the Northern Yellow Sea

于2015年9月,在渤海中部和黄海北部海域调查并采集表层沉积物样品,对样品的粒度、重金属(Cu、Pb、Zn、Cd、Cr)含量及有机碳含量进行了测定,探讨表层沉积物重金属含量、生态风险及其空间分布特征,分析影响生态风险空间分布的因素。结果表明:受河流输入及海洋沉积环境的影响,沉积物重金属含量较高的区域为河口区、渤海湾口以及北黄海中西部,调查区表层沉积物重金属Cu、Pb、Zn和Cr单因子潜在生态风险程度为低污染水平,Cd达到中等污染水平;表层沉积物重金属综合潜在生态风险均为中等水平。

The surface sediment samples were investigated and collected in the central Bohai Sea and northern Yellow Sea,in September 2015.The particle size,heavy metal(Cu,Pb,Zn,Cd,Cr)content and organic carbon content of the samples were measured.The heavy metal content,ecological risk and spatial distribution characteristics of surface sediments are discussed.The factors affecting the spatial distribution of ecological risks are analyzed.The results indicated that high heavy metal content in sediments is distributed in the estuary area,the Bohai Bay,and the Midwest of North Yellow Sea,which were affected by river input and marine depositional environment.The single-factor potential ecological risk of Cu,Pb,Zn and Cr in surface sediments in the survey area was low pollution level,and Cd reached moderate pollution level,and the comprehensive potential ecological risk of heavy metals in surface sediments in research area met moderate levels.