江苏省重金属防控区河流底泥中重金属污染及潜在生态风险评价研究

底泥是水生态环境的重要组成部分,其环境影响值得引起重视.选择了江苏省重金属污染防治"十二五"规划中划定的32个重金属污染防控区,在区域内主要的河流布设了42个底泥测点,对其中4种重金属(As、Cd、Hg、Pb)含量进行了测定,并采用潜在生态危害指数法进行了风险评价.结果表明:底泥中Pb、Hg、Cd、As4种重金属的潜在生态风险依次为Cd>Hg≈Pb>As.90.4%的测点处于轻微和中等生态风险状态.9.6%的测点处于严重和很严重生态风险状态.无极严重生态风险测点.

Research on Pollution and Potential Ecological Risk of Heavy Metals in River Sediment of Typical Areas in Jiangsu Province

Sediment is an important part of water ecological environment. It's also the repository and final home of heavy met-al pollutants. Heavy metals in sediment state will change with the external conditions. Its environmental impact is worthy of atten-tion. This research selected 32 areas which was defined in the heavy metal pollution prevention and treatment project during of the 12 th five-year plan of Jiangsu province. 42 sediment monitoring sites were set on the main rivers in these areas, and 4 heavy metals content in sediment( arsenic, cadmium, mercury, lead) was determined. The potential ecological risk method was used to evaluate the ecological risk of heavy metals in sediment. The results showed that the average potential ecological risk index of Pb, Hg, Cd. The potential ecological risk was Cd>Hg≈Pb>As. 90. 4% monitoring sites were in a state of mild and moderate eco-logical risk. 9. 6% monitoring sites were in grave and serious ecological risk status. No monitoring site was in infinite serious eco-logical risk status.