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当前位置: 首页 > 文章 > 巢湖水体沉积物重金属的分布及生态风险评价 农业环境科学学报 2008,27 (04) 1403-1408
Position: Home > Articles > Distribution and Ecological Risk Assessment of Heavy Metals in Sediments of Chaohu Lake Journal of Agro-Environment Science 2008,27 (04) 1403-1408

巢湖水体沉积物重金属的分布及生态风险评价

作  者：
程杰;李学德;花日茂;唐俊;卢洪秀
单  位：
安徽农业大学资源与环境学院;安徽省农产品安全重点实验室
关键词：
巢湖;沉积物;重金属;风险评价
摘  要：
为了解巢湖水体沉积物中重金属的污染现状及其潜在生态危害程度,追溯水域污染历史,研究随年代变化的污染梯度及规律,对巢湖湖区及部分出入湖支流沉积物中重金属元素(Cd、Cr、Pb、Cu、Zn、Mn、Fe)的空间分布进行了调查研究,并利用潜在生态风险指数法对其进行了综合评价分析。结果表明,测定的巢湖水体沉积物重金属中Zn、Cd的含量普遍比背景值要高,部分支流中的重金属含量比湖区要高,并以西半湖的南淝河污染较为严重,并已出现复合污染的趋势。沉积物中重金属的垂直分布一般规律是在0～8cm段出现峰值,且随采样深度的增加重金属含量有递减的趋势。利用潜在生态风险指数法对沉积物中重金属污染的评价结果显示,对巢湖生态风险构成危害程度最大的重金属是Cd,少数样点已属强生态危害。多种重金属潜在生态危害指数表明,南淝河已达到严重生态危害程度。
译  名：
Distribution and Ecological Risk Assessment of Heavy Metals in Sediments of Chaohu Lake
作  者：
CHENG Jie, LI Xue-de, HUA Ri-mao, TANG Jun,LU Hong-xiu(College of Environment and Resources, Anhui Agricultural University, Key Lab of Agro-food Safty of Anhui Province.Hefei 230036, China)
关键词：
Chaohu lake;sediment;heavy metals;risk assessment
摘  要：
Chaohu Lake is one of the five largest fresh lakes in China.The sediments of Chaohu Lake and some of its tributary rivers were sampled and analyzed for the contents of heavy metals(Cd,Cr,Pb,Cu,Zn,Mn,Fe) in order to know their spatial distribution and the potential ecological hazard.The results indicated that the levels of heavy metals in the sediments of the rivers(esp.the Nanfei River) were even higher than those of the lake.Among the heavy metals, their levels followed a decreasing order of Fe>Mn>Zn>Cr>Pb>Cu>Cd.Concerning the vertical distribution, the concentration of heavy metals decreased along with the increasing of depth, and the highest level is presented in the layer 0～8 cm of depth.The potential ecological risk index was used to evaluate metals pollution in sediments of Chaohu Lake.By means of the risk assessment methodology, based on available data, it was demonstrated that Nanfei River was exposed to a very high potential ecological risk.Among the analyzed heavy metals, Cd exhibited the highest pollution degree at the most of the sampling points.The other points were under a low potential ecological risk.

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