【摘要】 以西安市曲江池、太液池、兴庆湖、广运潭和未央湖为研究对象,基于地累积指数法和潜在生态风险指数法对湖泊表层沉积物重金属(Cu、Zn、Pb、Cr、Cd、Mn和Ni)污染风险进行评价,并探讨湖泊污染来源。结果表明,湖泊沉积物中各重金属元素含量均高于陕西省土壤元素背景值,且分布具有明显的空间差异性;地累积指数法评价结果显示,曲江池、兴庆湖和广运潭的Zn均达到偏中度污染,太液池、广运潭和未央湖的Cd达到偏中度污染,兴庆湖Cd为偏重度污染;潜在生态风险指数法评价结果表明,研究区域重金属生态风险以Cd为主。五大湖泊的污染来源包括自然源和人为源。更多还原

【Abstract】 This paper targets at researching the heavy metals in surface sediments of the five lakes( Qujiang Pool,Taiye Pool,Xingqing Lake,Guangyun Pool,Weiyang Lake) in Xi’an. The contents of heavy metals indicators( Cu,Zn,Pb,Cr,Cd,Mn and Ni) were analyzed. The geological accumulation index and potential ecological risk index were applied for assessing the status of sediment heavy metal pollution and the extent of potential ecological risk. The results are as follows: The average contents of heavy elements were higher than that in soil element background values of Shaanxi Province. The heavy metals contents distribution in the surface sediments varied in different regions. The results of geological accumulation index method showed that Zn and Cd pollution of lakes in Xi’an were serious. The potential ecological risk assessment indicated that Cd was the main heavy metal pollutant for the five lakes. Pollution sources of the five lakes included natural sources and anthropogenic sources.更多还原