金华市武义江沉积物重金属污染特征及风险评价  

Heavy metal pollution and its risk assessment in sediments of Jinhua Wuyi River

作　　者：李文[1] 胡忠行[1] 吉茹[1] 张曼[1] 卜鹏[1] 

机构地区：[1]浙江师范大学地理与环境科学学院,浙江金华321004

出　　处：《浙江师范大学学报（自然科学版）》2016年第1期108-114,共7页Journal of Zhejiang Normal University:Natural Sciences

基　　金：华东师范大学河口与海岸学国家重点实验室开放基金资助项目(SKLEC-KF201205)

摘　　要：以金华市武义江柱样沉积物为研究对象,在粒度分析和重金属元素测量的基础上,利用地质累积指数法和潜在生态危害指数法对武义江沉积物重金属污染状况进行了评价.结果表明:1)武义江柱样沉积物的物质组成以粘土质粉砂为主,自底部向上先变细再变粗;2)武义江柱样沉积物中Cr,Ni,Cu,Zn,Cd和Pb 6种重金属元素含量的平均值分别为186.81,85.30,158.42,340.13,0.66和36.81 mg·kg-1,均明显高于金华市土壤的背景值,且受粒度特征影响,自柱样底部向表层呈先增加后降低的趋势;3)除Pb元素外,其余5种元素均处于不同程度的污染状态,Cd,Ni和Cu污染较重,需重点控制,且重金属污染程度在垂向空间上处于波动变化状态,总体上自底部向表层呈先增强后减轻的趋势;4)流域上游永康、武义地区的五金产业和交通运输业排废是造成武义江重金属污染的主要原因,需加强环保措施和加快经济发展模式转型,以保护武义江的生态环境.Heavy metals were often regarded as important proxie of sediment quality.The characteristics of heavy metal content and particle size of core sediments from Wuyi River were surveyed.The environmental risk assessment was conducted systematically by using methods such as index of geo-accumulation and potential ecological risk index.The results indicated that the sediments were dominated by clayey sand.The particle size showed an first fining and then coasening trend from bottom to top, controlled by hydrological dynamics. The average contents of Cr, Ni, Cu, Zn, Cd and Pb were 186.81, 85.30, 158.42, 340.13, 0.66 and 36.81 mg· kg-1 , respectively, all of which exceeded the background values in Jinhua soils.From bottom to top, the heavy metal content first increased and then decreased, affected by the grain size characteristics.Ex-cept Pb, the elements implied different degrees of pollution, among which Cd, Ni and Cu were more seriously polluted and needed particular control.The pollution degree fluctuated vertically, generally first increased and then decreased upwards.The main source of heavy metal pollution was regarded as metacs industry and trans-portation in Yongkang and Wuyi areas.It was suggeted to take environmentally friendly measures and acceler-ate economic transformation to protect the ecological environment.

关 键 词：重金属污染 河流沉积物 粒度 地质累积指数 潜在生态风险指数 武义江 

分 类 号：X131.2[环境科学与工程—环境科学]