海河干流（市区段）表层沉积物重金属污染及变化趋势分析

根据1990—2006年监测资料,对海河干流（市区段）沉积物中重金属的现状和变化趋势进行了分析,采用地积累指数和Hakanson危害指数对海河干流（市区段）沉积物重金属富集现状和对水生生物危害进行评估。结果显示：海河干流（市区段）表层沉积物除Zn外,均呈现污染下降趋势。海河干流（市区段）沉积物中重金属对生物潜在危害顺序为Cd〉Hg〉As〉Cu〉Pb〉Cr〉Zn,各项指标对生物潜在危害性上游大于下游。

Heavy Metal Pollution and Their History Trend in the Surface Sediment of Haihe River

The characteristics of temporal and spatial distribution of heavy mental（ Cu, Zn, Pb, Cd, Hg, As, Ni, Cr） in the surface sediment of haihe river had been analysed. The potential ecological risk（PER） index（PER） and the geoaccumulation index（Igeo） were applied for assessing the pollution of heavy metals in haihe river. The results showed that the lego were higher than zero. Except Zn, every item had a downward trend. RI were higher than 150. The heavy metal PER order was following： Cd 〉 Hg 〉 As 〉 Cu 〉 Pb 〉 Cr 〉Zn.