鄱阳湖底泥中重金属污染现状评价

为了解丰、枯水期鄱阳湖沉积物中重金属含量以及各污染物的潜在生态危害程度,在对鄱阳湖污染现状详细调查与分析的基础上,利用地积累指数法和潜在生态风险指数法对鄱阳湖底泥中的重金属污染进行综合性的评价分析,并与单因子指数评价结果相比较.结果表明,鄱阳湖底泥已经受到了不同程度的重金属污染.从总体的污染程度分析,各污染物的污染程度大小排列次序为:Cu>Pb>Zn>Cd,这与单因子指数法评价结果一致;各污染物对鄱阳湖生态风险构成危害的影响程度排列次序为:Cd>Pb>Zn>Cu;污染的地区和时间差异大,各采样点污染程度排序为:鄱阳饶河>鄱阳湖龙口>鄱阳湖南矶山>星子冬枯山>星子渔民村,且枯水期普遍大于丰水期.

Assessment on Heavy Metal Pollution in the Sediment of Poyang Lake

In order to know the heavy metals content and the degree of the potential ecological risk in the sediment of Poyang Lake in high-water period and lowwater period,based on the detailed survey and analysis of the current state of pollution in Poyang Lake,using the Index of Geoaccumulation and the Potential Ecological Risk Index evaluate the heavy metals pollution of Poyang Lake.The results indicate that Poyang Lake has been polluted by heavy metals in various degrees.According to the Index of Geoaccumulation,the order of the analyzed heavy metals,arranged from highest to lowest pollution degree,is as follows: Cu>Pb>Zn>Cd;The ecological risk to Poyang Lake is: Cd>Pb>Zn>Cu;And the pollution is different from space and time,the pollution degree of each sampling site is arranged in the following order: Rao River>Longkou>Nanji shan>Dongku shan>Yumin village,and the degrees in low-water season are bigger than the degrees that in the high-water period commonly.