邕江南宁市区段表层沉积物重金属污染评价  

Contamination Assessment of Heavy Metals in the Surface Sediments of the Yongjiang River in Nanning City,China

作　　者：李平阳[1] 姜白杨 莫创荣[1] 王英辉[1] 喻泽斌[1] 黎大荣[1] 

机构地区：[1]广西大学环境学院,广西南宁530004

出　　处：《安全与环境工程》2014年第4期91-95,共5页Safety and Environmental Engineering

基　　金：广西北部湾经济区基础研究重大专项(2010GXNSFE013006);广西壮族自治区科学技术协会课题(桂科协[2013]B-02);广西南宁市科技攻关计划项目(20133146);广西大学创新实验项目(201139)

摘　　要：为了了解邕江南宁市区段表层沉积物中重金属污染现状,本文采用ICP-OES仪测定了沉积物中Cu、As、Cr、Pb、Cd、Zn和Hg的含量,并应用地质累积指数法和潜在生态危害指数法对其污染状况进行了评价。结果表明:邕江表层沉积物中Hg未检出,其他6种重金属元素的平均含量依次为Zn>Cu>Cr>As>Pb>Cd,其中Cd和As的平均含量均高于《土壤环境质量标准》的二级标准值,其他4种重金属元素的平均含量则低于《土壤环境质量标准》的二级标准值;地质累积指数法评价结果显示,邕江表层沉积物中重金属总体上为中度污染,其中Cd污染最为严重,为强—极强污染,Cu、As和Zn为无—中等污染,Pb和Cr为无污染;潜在生态危害指数法评价结果显示,邕江表层沉积物中重金属总体上属于中等潜在生态危害程度,其中Cd污染达到较重生态危害程度,As污染达到中等生态危害程度,其他4种重金属均为低等生态危害程度。可见,较其他重金属而言,邕江表层沉积物中重金属Cd和As的污染更为严重,需引起相关部门的重视。For the purpose of exploring the contaminant characteristics of the heavy metals in the Yongjiang River sediments,this study measures the contents of heavy metals（Cu,As,Cr,Pb,Cd,Zn and Hg）in the surface sediments of the Yongjiang River in Nanning City,China by ICP-OES and employs Muller＇s geoaccumulation index（Igeo）and Hakanson potential ecological risk index（RI）to assess the pollution degree of heavy metals.Results show that the average contents of the seven investigated metals are in the order of ZnCuCrAsPbCdHg（not detected）.The average contents of Cd and As are higher than the second standard values prescribed in The Environmental Quality Standard for Soils,and the average contents of the other four metals are lower than the second standard values prescribed in the document.The assessment results based on geoaccumulation indexes indicate that the pollution of heavy metals in the surface sediments of the river is moderate with respect to seven studied elements,among which the pollution of Cd is the most serious and reaches the strong to very strong pollution;Cu,As and Zn are non-pollution to moderate-pollution;and Pb and Cr are non-pollution.The assessment results based on potential ecological risk indexes indicate that the pollution of the seven metals in the surface sediments studied maintains at a moderate level.The contaminations of Cd,As and other four metals cause severe,moderate and low ecological risks in this area respectively.Therefore,Cd contamination and As contamination in the Yongjiang River are more serious.Local governments should tackle the problem seriously.

关 键 词：表层沉积物 重金属污染评价 地质累积指数法 潜在生态危害指数法 邕江 

分 类 号：X825[环境科学与工程—环境工程]