霍邱县城湖泊沉积物重金属环境容量评价与预测

Evaluation and Prediction of Environmental Capacities of Heavy Metals in the Surface Sediments of Lakes in Huoqiu County

为阐明霍邱县城西湖和城东湖沉积物重金属的环境容量,在城西湖和城东湖各采集了30件沉积物样品,运用综合环境容量指数法(PI),研究了城西湖和城东湖沉积物重金属环境容量特征及空间分布规律,估算了静态和动态环境容量,预测了近百年的变化趋势.结果表明,城西湖和城东湖沉积物中As、Cd、Cr、Cu、Hg、Ni、Pb和Zn含量均值未超过国家规定的土壤风险筛选值;城西湖和城东湖沉积物各重金属元素单项环境容量指数平均值大小分别为:Ni(0.81)Cr>Pb>Cu>Ni>As>Hg>Cd.5~20 a之内静态和动态年容量变化速度大于其他年限容量变化速度,各年限动态年容量均大于静态年容量.

To clarify the environmental capacity of heavy metals in sediments of Chengxi Lake and Chengdong Lake in Huoqiu County,30 sediment samples were collected from Chengxi Lake and Chengdong Lake,respectively.The environmental capacity characteristics and spatial distribution of heavy metals in sediments of Chengxi Lake and Chengdong Lake were studied using the comprehensive environmental capacity index,the static and dynamic environmental capacity was estimated,and the change trend of nearly one hundred years was predicted.The results showed that the average contents of As,Cd,Cr,Cu,Hg,Ni,Pb,and Zn in the sediments of Chengxi Lake and Chengdong Lake did not exceed the national soil risk screening values.The average values of the single environmental capacity index of heavy metals in the sediments of Chengxi Lake and Chengdong Lake were in the following orders:Ni(0.81)Cr>Pb>Cu>Ni>As>Hg>Cd.Within 5 to 20 years,the static and dynamic annual capacity changed faster than that of other years,and the dynamic annual capacity of each year was greater than the static annual capacity.