于桥水库水源地水体重金属潜在生态风险评价  

Ecological risks evaluation of heavy metals in source water of Yuqiao Reservoir

作　　者：侯迎迎 王祖伟 苗钰婷 王倩倩 HOU Yingying;WANG Zuwei;MIAO Yuting;WANG Qianqian(School of Geographic and Environmental Sciences,Tianjin Normal University,Tianjin 300387,China)

机构地区：[1]天津师范大学地理与环境科学学院,天津300387

出　　处：《天津师范大学学报（自然科学版）》2018年第5期52-57,共6页Journal of Tianjin Normal University：Natural Science Edition

基　　金：国家自然科学基金资助项目(40973078)

摘　　要：针对于桥水库水源地河流中重金属可能存在的生态风险,以于桥水库水源地河流33个子流域采样点重金属的监测数据为基础,对河流悬浮颗粒物和表层沉积物中Cd、As、Pb、Cu、Cr和Zn等重金属的含量进行分析,并采用Hakanson潜在生态风险指数评价了河流表层沉积物中以上重金属污染的状况和潜在生态风险.结果表明:河流悬浮颗粒物中Cd和As的平均含量超过我国土壤环境质量一级标准值3倍,Cu和Cr的平均含量是土壤环境质量一级标准值的1.6倍,Pb和Zn的平均含量低于土壤环境质量一级标准,Cd和Cr显示出一定的生态风险;表层沉积物中Cu、As和Cr的平均含量和部分表层沉积物样品中Pr、Cd和Zn的平均含量超过我国土壤环境质量一级标准值;比较3条支流河流可知,Cd、As和Pb在沙河沉积物中含量最高,在黎河沉积物中含量最低;Cr和Zn在沙河沉积物中含量最高,在淋河沉积物中含量最低;Cu在淋河沉积物中含量最高,在黎河沉积物中含量最低. Hakanson潜在生态风险评价结果显示,水体悬浮颗粒物中As和Cd分别属于极强和较强生态风险等级,河流表层沉积物中Cd为中等潜在生态风险级别,重金属总体属于中等风险级别.In the view of the potential ecological risk caused by heavy metals in source water of Yuqiao Reservoir,the concentrations of heavy metal including Cd,As,Pb,Cu,Cr and Zn in river suspended particulate matter and surface sediments were analyzed based on the heavy metals monitoring data of 33 sub watershed sampling sites in Yuqiao Reservoir tributaries,and the pollution condition and possible ecological risk of these heavy metal in river surface sediments were evaluated by Hakanson potential ecological risk index. The results show that the average concentrations of Cd and As in the suspended particulate matter are 3 times more than the first class level of Chinese soil environmental quality standard, the average concentrations of Cr and Cu are 1.6 times as much as the first class of Chinese soil environmental quality standard,the average concentrations of Pb and Zn are lower than the first class of Chinese soil environmental quality standard, Cd and Cr in the suspended particulate matter reveal some ecological risks. The concentrations of As, Cu and Cr in surface sediments and Pb, Cd and Zn in a part of the surface sediment samples exceed the first class of Chinese soil environmental quality standard. Compared with three tributaries rivers, the concentrations of Cd,As,and Pb in surface sediments are the highest in Sha River and the lowest from Li River,the concentrations of Cr and Zn in surface sediments are the highest in Sha River and the lowest in Lin River,and the concentration of Cu in surface sediments is the highest from in Lin River and the lowest in Li River. Evaluation results of Hakanson potential ecological risk index show that As and Cd in suspended particulate matter have extremely strong and strong ecological risk level,respectively,Cd in surface sediments has moderately ecological risk level,and heavy metals are generally at moderate risk level.

关 键 词：于桥水库水源地水体 悬浮颗粒物 表层沉积物 重金属 生态风险评价 

分 类 号：P95[天文地球—自然地理学] X524[环境科学与工程—环境工程]