舟山海域表层沉积物重金属分布、来源及潜在生态风险评价

以舟山海域表层沉积物为研究对象，测定了研究区33个采样站位中Zn、Cu、Cd、Pb、Hg、As、Cr等7种重金属的含量，并分析评价了其污染分布、来源和潜在生态风险。结果表明:舟山海域表层沉积物各重金属含量差异较大，其分布总体呈西高东低、近岸海域高于远岸海域、局部存在高值区的特征。Zn、Cu、Pb、Hg、As、Cr主要受钱塘江、甬江沿岸工农业生产及入海排污口的影响；Cd可能受到海洋沉积环境对重金属在不同环境相转换机制的影响。Cd和Hg是研究区主要的潜在生态风险因子，高值区主要位于杭州湾口外、中街山列岛及长白岛-秀山岛等附近海域。

Spatial distribution,source and potential ecological risk assessment of heavy metals in surface sediments of Zhoushan sea area

Concentrations of 7 heavy metals (Zn, Cu, Cd, Pb, Hg, As and Cr) from 33 surface sediment samples in Zhoushan sea area were determined to study their distribution, possible sources and potential ecological risks.The results showed that the concentrations of the heavy metals in the surface sediments exhibited great differences.The distribution of heavy metals decreased gradually from the west to the east, and from the offshore to the open sea.Some regions had very high concentrations.Zn, Cu, Pb, Hg, As and Cr mainly originated from Qiantangjiang River, Yongjiang River coastal industrial or agricultural production and land-sourced pollutants, and there might be a special transformation of Cd in different environmental medium.The results of potential ecological risk assessment showed that Cd and Hg were the main potential risk factors in the study area, and the high values mainly appeared at the Hangzhou Bay estuary, Zhongjieshan archipelago and Changbai-Xiushan sea area.