玉滩湖表层沉积物重金属污染特征及潜在生态风险评价  

Pollution Characteristics and Potential Ecological Risk Assessment of Heavy Metals in Surface Sediments of Lake Yutan

作　　者：丁佳佳[1] 蔡庆[2] 李江华[1] 

机构地区：[1]重庆市环境科学研究院,重庆401147 [2]重庆工程职业技术学院矿业与环境工程学院,重庆402260

出　　处：《四川环境》2016年第4期107-112,共6页Sichuan Environment

基　　金：重庆市教委科学技术研究项目(KJ1403202)

摘　　要：为了掌握重庆玉滩湖表层沉积物重金属污染情况,监测了玉滩湖表层沉积物中Cr、Cd、Pb、Cu和Zn的相对含量,并采用地质累积指数法和潜在生态风险指数法对重金属的污染程度和潜在生态风险进行评价。结果表明,玉滩湖表层沉积物中重金属Cr、Cd、Pb、Cu和Zn的平均含量分别为28.41mg/kg、0.75mg/kg、46.04mg/kg、66.98mg/kg、131.55mg/kg,Pb和Cu受人为活动影响较大;重金属污染程度为Cu(轻度)>Pb(轻微)>Cd(轻微)>Zn(轻微)>Cr(无污染);有机质含量和重金属Pb、Cd含量显著正相关,是玉滩湖流域重金属污染防治的重点因子;玉滩湖总体的生态风险程度为轻微,重金属单项潜在生态风险程度为Cd(中等)>Cu(轻微)>Pb(轻微)>Zn(轻微)>Cr(轻微),Cd是主要的生态风险因子。The contents of heavy metals or metalloid （ Cr, Cd, Pb, Cu and Zn） were investigated in surface sediments of LakeYutan to understand its current pollution status. The contamination level and potential ecological risks of heavy metals were assessed with geo - accumulation index and potential ecological risk index methods, respectively. The results showed that the averagecontents of Cr, Cd, Pb, Cu and Zn in the sediments were 28.41mg/kg, 0. 75mg/kg, 46.04mg/kg, 66. 98mg/kg, 131.55mg/kg, respectively. The contents of Pb and Cu were greatly influenced by human activities. The contamination degree of heavy metals was Cu （ slightly polluted） 〉 Pb 〉 Cd 〉 Zn 〉 Cr （ no pollution）. The statistical analysis showed that there were positive correlations between Pb , Cu and organic matter,which were the main pollutants. The LakeYutan has low ecological risks with Cd as the main contributors. The order of ecological risks of heavy metals was Cd 〉 Cu 〉 Pb 〉 Zn 〉 Cr.

关 键 词：玉滩湖 表层沉积物 重金属 地质累积指数 潜在生态风险指数 

分 类 号：X524[环境科学与工程—环境工程]