云蒙湖表层沉积物重金属分布特征及风险评价  

Spatial distribution characteristics and risk assessment of heavy metals in sur-face sediments in Lake Yunmeng

作　　者：曹伟[1,2] 张雷[1,2] 秦延文[1,2] 迟明慧 赵艳民[1,2] 杨晨晨[1,2] 时瑶[1,2] CAO Wei;ZHANG Lei;QIN Yanwen;CHI Minghui;ZHAO Yanmin;YANG Chenchen;SHI Yao(State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;Institute of Water Ecology and Environment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)

机构地区：[1]中国环境科学研究院环境基准与风险评估国家重点实验室,北京100012 [2]中国环境科学研究院水生态环境研究所,北京100012

出　　处：《地学前缘》2021年第5期448-455,共8页Earth Science Frontiers

基　　金：国家重点研发计划项目(2016YFA0600904)。

摘　　要：为了解云蒙湖表层沉积物中重金属的污染状况,选取云蒙湖沉积物中6种重金属(Cu、Zn、Pb、Cr、Cd、As)作为研究对象,测定并分析其在云蒙湖表层沉积物中的分布、来源及生态风险,以期为云蒙湖沉积物中重金属污染治理及饮用水安全保障提供依据。采用富集系数法、相关性分析及聚类分析对重金属来源进行分析,并选用富集系数法、地累积指数法和潜在生态危害指数法对重金属污染程度及潜在生态危害进行了评价。结果表明:云蒙湖表层沉积物中6种重金属Cu、Zn、Pb、Cr、Cd、As平均含量分别为20.9、73.1、23.1、62.0、0.4和4.5 mg/kg;与临沂市土壤背景比较,Cd、Zn和Cr的含量超过临沂市土壤背景值,Cd污染最严重。重金属来源分析结果显示:Cd受人类活动影响较大,可能与区域农业和林业施肥有关;Cu、Zn、Pb、Cr和As这几种重金属以自然来源为主。综合富集系数法、地累积指数法和潜在生态危害指数法3种评价方法的结果得出,云蒙湖表层沉积物中Cd为最主要的污染元素,且具有较强的生态危害。To explore the pollution characteristics of heavy metals in Lake Yunmeng,the distribution,source and ecological risk of six heavy metals(Cu,Zn,Pb,Cr,Cd and As)in lake surface sediments were analyzed to provide a basis for the pollution treatment and ensure drinking water safety for Lake Yunmeng.The source of heavy metals was investigated by enrichment factor,correlation and cluster analysis,and the contamination and potential ecological risk of heavy metals were evaluated by using geoaccumulation,enrichment factor and potential ecological risk indexes.The results indicate the average contents of Cu,Zn,Pb,Cr,Cd and As were 20.9,73.1,23.1,62.0,0.4 and 4.5 mg/kg,respectively.Compared with the soil background values,elevated Cd,Zn and Cr levels were found in Linyi City,and Cd pollution was the most serious.Source analysis shows that Cd was greatly affected by human activities likely related to local fertilizer use in agriculture and forestry,whereas Cu,Zn,Pb,Cr and As were mainly from natural sources.The evaluation results indicate Cd was the main polluting element in surface sediments posing relatively high ecological risk in Lake Yunmen.

关 键 词：云蒙湖 表层沉积物 重金属 源分析 风险评价 

分 类 号：X142[环境科学与工程—环境科学] X141