阳宗海表层沉积物中的重金属生态风险评估.pdf

第28卷第5期 水摇 资摇 源摇 保摇 护 2012年9月 Vol.28 No.5 WATER RESOURCES PROTECTION Sep. 2012 DOI:10.3969/ j.issn.1004 6933.2012.05.004 阳宗海表层沉积物中的重金属生态风险评估 张玉玺,孙继朝,向小平,黄冠星,刘景涛,陈摇 玺,王金翠 (中国地质科学院水文地质环境地质研究所,河北 正定摇 050803) 摘要:对从阳宗海湖底表层采集的25 组沉积物样品中的10 种重金属质量比进行分析,结果表明, Ti、Mn、Zn、V、Cr、Cu、Ni、Co、Pb和As的质量比平均值均超过了当地土壤背景值。 而重金属系统聚 类分析表明,Zn、Cr、Pb、As 高度相关,其污染主要由于人类活动造成;Ti、Mn、V、Cu、Ni、Co 的分布特 征相似,其污染原因以岩石风化等自然因素为主。 单因子富集系数评价表明,阳宗海10 种重金属 均达到了中度富集程度,其中As、Cu、Cr 富集程度较为突出。 用Hakanson 潜在生态风险指数法评 价阳宗海表层沉积物中重金属的生态风险,结果表明,阳宗海表层沉积物中重金属的生态风险总体 属轻微程度,阳宗海南岸局部区域达到中等生态风险程度。 几种重金属对阳宗海生态风险的贡献 由大到小依次为As、Cu、Co、Ni、Pb、Cr、V、Zn、Mn、Ti,其中,As是阳宗海最突出的生态风险因子。 关键词:沉积物;重金属;生态风险评估;阳宗海 中图分类号:X171.5摇 摇 摇 文献标识码:A摇 摇 摇 文章编号:1004 6933(2012)05 0019 06 Evaluation of ecological risk of heavy metals in surface sediments from Yangzonghai Lake ZHANG Yu鄄xi,SUN Ji鄄chao,XIANG Xiao鄄ping,HUANG Guan鄄xing, LIU Jing鄄tao,CHEN Xi,WANGJin鄄cui (Institute of Hydrogeology and Environmental Geology,ChineseAcademy of Geological Sciences, Zhengding 050803,China) Abstract:The concentrationsof ten heavy metalsin25 groupsof surface sediment samplesfromYangzonghai Lake were analyzed. The results show that the mean concentrations of Ti,Mn,Zn,V,Cr,Cu,Ni,Co,Pb,and As were higher than their natural background values. Cluster analysis indicated that Zn,Cr,Pb,and Aswere highly correlated whith one another and mainly came from human activities,and Ti,Mn,V,Cu,Ni,and Co were also well correlated and mainly came from the natural lenvironment. The evaluation of the single鄄factor pollution index indicated that the ten heavy metalswere enriched to a certain degree,all reaching the level of medium pollution.