大纵湖(兴化片区)底泥重金属时空分布特征及生态风险评价  

Temporal and Spatial Distribution Characteristics of Heavy Metals in Sediments and Ecological Risk Assessment in Lake Dazong(Xinghua Area)

作　　者：朱冬冬 黄晨悦 周莉 尤晓慧 杭小帅 孔明 韩天伦 崔益斌 丁程成 ZHU Dong-dong;HUANG Chen-yue;ZHOU Li(Nanjing Institute of Environmental Sciences,Ministry of Ecology and Environment,Nanjing,Jiangsu 210042)

机构地区：[1]生态环境部南京环境科学研究所,江苏南京210042

出　　处：《安徽农业科学》2022年第10期54-58,共5页Journal of Anhui Agricultural Sciences

基　　金：水体污染控制与治理科技重大专项(2018ZX07208006-004);国家自然科学基金青年科学基金项目(41907154);江苏省自然科学基金面上项目(BK20191110)。

摘　　要：为探究大纵湖(兴化片区)底泥重金属时空分布及其潜在的生态风险,运用地累积指数法和潜在生态危害指数法分析铜(Cu)、锌(Zn)、铅(Pb)、镉(Cd)、铬(Cr)、镍(Ni)、砷(As)、汞(Hg)8种重金属的污染状况,评估重金属污染风险等级,探讨潜在的影响因素。结果表明,地累积指数法得出Cd是研究区污染程度最高,达到偏中度污染程度;潜在生态危害指数法得出,Cd达到强生态危害,Hg在入湖河口和湖内达到强生态危害,出湖河口达到中等生态危害。底泥重金属时空特征研究发现,研究区底泥重金属主要在秋冬两季累积,外来污染源主要来源于鲤鱼河、中引河,而西孤河影响相对较小。In order to explore the temporal and spatial distribution of heavy metals in the sediments of Lake Dazong(Xinghua area)and their potential ecological risks,the geo-accumulation index method and the potential ecological hazard index method were used to analyze 8 heavy metals(Cu,Zn,Pb,Cd,Cr,Ni,As,Hg),assess the risk level of heavy metal pollution,and explore potential influencing factors.The result showed that the geo-accumulation index method shows that Cd had the highest degree of pollution in the study area,reaching a moderate degree of pollution.According to the potential ecological hazard index method,Cd reached a strong ecological hazard,Hg reached a strong ecological hazard,the estuary of the lake reached a moderate ecological hazard.Through the study of the temporal and spatial characteristics of sediment heavy metals,it was found that the sediment heavy metals in the study area mainly accumulated in autumn and winter.The external pollution sources mainly came from Liyu River and Zhongyin River,while the influence of Xigu River was relatively small.

关 键 词：底泥 重金属 时空分布 生态风险 大纵湖(兴化片区) 

分 类 号：X826[环境科学与工程—环境工程]