红枫湖沉积物中重金属污染特征与生态危害风险评价

调查了红枫湖沉积物中重金属的含量、分布特征与富集情况. 分别以现代工业化前正常颗粒沉积物中重金属含量的最高背景值和红枫湖周边环境土壤的背景值为参比值，对红枫湖沉积物中重金属的富集系数和生态危害系数以及各采样点的生态危害指数进行了探讨，并结合瑞典学者Lars Hkanson潜在生态危害指数法对红枫湖沉积物中重金属的生态危害进行了评价. 结果表明:该湖泊沉积物中重金属含量分布呈现一定的区域特征，北湖湖区重金属平均含量高于南湖湖区；以现代工业化前正常颗粒沉积物中重金属含量的最高背景值为参比值，重金属的富集顺序为Cd＞Hg＞As＞Cu＞Zn＞Pb，污染水平顺序为Cd＞Hg＞As＞Cu＞Pb＞Zn；以红枫湖周边环境土壤平均值为参比值，重金属的富集顺序为Cu＞Cd＞Zn＞As＞Pb＞Hg，污染水平顺序为Cd＞Hg＞As＞Cu＞Pb＞Zn.  

Pollution Characteristic and Ecological Risk Assessment of Heavy Metals in Superficial Sediments of Hongfeng Lake

Concentrations, distribution and accumulation of heavy metals in the sediments of Hongfeng Lake were investigated. The highest values for heavy metalsconcentrations in sediments before the modern industrialization of the world and the environmental background values of Hongfeng Lake were used to analyze the accumulation coefficient and potential ecological risk (PER) coefficients for heavy metal. The PER index for each sample location was also discussed. The method for evaluating PER index presented by Lars Hkanson was applied toassess the ecological risk. The distribution of various heavy metal contents reveals the regional distributive characteristics, and the concentrations are higher in the north part of the lake than those in the south part. When the highest values for heavy metals concentrations in sediments before the modern industrialization of the world were taken as references, the accumulating order for these heavy metals is: Cd＞Hg＞As＞Cu＞Zn＞Pb, and the order of pollution level is: Cd＞Hg＞As＞Cu＞Pb＞Zn. When the environmental background values of Hongfeng Lake worked as references, the accumulating order is: Cu＞Cd＞Zn＞As＞Pb＞Hg, and theorder of pollution level is: Cd＞Hg＞As＞Cu＞Pb＞Zn.