近十年京杭运河苏州段底泥重金属生态风险分析

摘要

采用Hakonson生态风险指数法对京杭运河苏州段近十年来底泥重金属污染进行评价，对其空间分布和时间分布规律进行了分析。结果表明，京杭运河苏州段重金属为低生态风险等级，汞和镉为主要的生态风险因子，城区老运河段重金属生态风险指数最高。近十年来，京杭运河苏州段底泥重金属潜在生态风险指数呈下降趋势，重金属污染得到有效的控制。%The pollutions in recent ten years of the heavy metals in the sediments of the Grand Canal in Suzhou were assessed with the Hakonson potential ecological risk index methods , and the spatial and temporal variations of the ecological risk were analyzed .According to the analysis results , the heavy metals in the sedi-ments of the Grand Canal were in the category of low in ecological risk , Hg and Cd were the potential ecological risk factors, and the ecological risk index of the old Grand Canal was the highest .In the last ten years, the eco-logical risk index of the heavy metals in the sediments of the Grand Canal showed a decrease tendency .The heavy metal pollution has been effectively controlled .