舟山附近海域表层沉积物粒度及重金属研究

以舟山附近海域表层沉积物2016年8月的监测资料为基础，对沉积物粒度特征和重金属含量及其影响因素进行了研究，对重金属污染程度进行了评价，旨在为舟山附近海域沉积环境的研究提供地球化学资料。结果表明:舟山附近海域表层沉积物粒度组成均以粉砂和粘土为主；沉积物类型以粘土质粉砂和粉砂质粘土为主；各重金属元素平均含量顺序依次为Zn > Cr > Cu > Pb > Cd > Hg；空间分布波动程度顺序依次为Pb > Cu > Cd > Zn > Cr > Hg；Cu、Cd、Pb、Cr、Zn具有相似污染源；有机碳是控制表层沉积物中重金属含量分布的重要因素；重金属污染程度依次为Hg>Cd>Cu>Zn>Pb>Cr，趋向中度污染水平。

A study of particle size and heavy metals in surface sediments of Zhoushan region

Based on the monitoring data of surface sediments of Zhoushan region in Aug.2016, the particle size of sediments, the content of heavy metals and its influencing factors were analyzed, the degree of heavy metal pollution was evaluated, in order to provide geochemical data for the study of sedimentary environment in Zhoushan region.The results showed that the particle size of surface sediments in the study area was mainly composed of silt and clay.The type of sediment was dominated by clay powder and silvery clay.The order of average concentration of heavy metals was Zn>Cr>Cu>Pb>Cd>Hg.The order of fluctuations in spatial distribution was Pb>Cu>Cd>Zn>Cr>Hg.Cu, Cd, Pb, Cr and Zn had similar pollution sources.Organic carbon was an important control factor in the distribution of heavy metals.The order of the level of heavy metals pollution was Hg>Cd>Cu>Zn>Pb>Cr, heavy metals pollution incline to moderate level of pollution.