长江口海域表层沉积物重金属元素赋存形态特征  

The Geochemical Forms of Heavy Metals in Surface Sediments in the Yangtze River Estuary

作　　者：何中发[1] 方正[1] 温晓华[1] 张琢[1] 王张华[2] 赵宝成[1] 谢建磊[1] 李晓[1] 

机构地区：[1]上海市地质调查研究院,上海200072 [2]华东师范大学河口海岸学国家重点实验室,上海200062

出　　处：《上海国土资源》2012年第2期69-73,共5页Shanghai Land & Resources

基　　金：中国地质调查局"上海市近岸海域多目标区域地球化学调查"(GZTR20060102);上海市科委"上海市后备土地资源潜力与动态规律研究"(072112020);上海市科委"海岸带地质环境对城市安全影响监测体系研究"(09231203300)

摘　　要：通过长江河口地区水下表层沉积物样品多种化学元素的赋存形态分析测试数据,综合分析重金属元素的赋存形态特征。研究结果显示:镉、汞、铅残渣态所占比例均小于50%,锌、砷、铬、铜、镍残渣态占比均大于50%;8个元素的残渣态与全量呈显著正相关关系。沉积环境和沉积物粒径对重金属元素赋存形态具有重要影响。沉积物的物质来源、矿物组成特征、水动力作用与沉积物粒度和物理化学条件等是长江口地区表层沉积物重金属元素赋存形态的主要控制因素。Near surface sediments from the Yangtze River Estuary were analyzed for the presence of heavy metals.The results show that residual concentrations of Cd,Hg,and Pb are all less than 50%,while Zn,As,Cr,Cu,and Ni are more than 50%.Furthermore,the residual and total amounts of these eight heavy metals（Cd,Hg,Pb,Zn,As,Cr,Cu,and Ni） have a significant positive correlation with the total heavy metal content which suggests that the sedimentary environment and sediment grain size have a significant influence on the geochemical form of heavy metals.We conclude that the source material is the primary control on the occurrence of heavy metals in the Yangtze Estuary,followed by mineral composition,and then hydrodynamics,sediment grain size,and physicochemical conditions.

关 键 词：长江口 沉积物 重金属 赋存形态 

分 类 号：P736.21[天文地球—海洋地质]