中文摘要：

对巢湖市双桥河清淤底泥堆场及其周边农田土壤进行等距离布点采样,所取样本采用BCR3态连续提取消解方法分析样品中3种具有代表性重金属的含量,探讨堆场重金属释放的程度。结果表明,堆场底泥中的铬、铜和铅等重金属污染物的释放量分别为43.9%、13.6%和18.2%;底泥中的重金属大部分均以残渣态的稳定形式存在。采用潜在生态危害指数法对堆场周边农田土壤中的铬、铜、铅进行潜在生态危害评价,表明：其生态危害轻微。

英文摘要：

The mass ratios of heavy metals in Shuangqiao sediment stack of Chaohu lake and surround- ing agricultural region were measured, the existing forms of heavy metals were analyzed by BCR3 sequential extraction procedures, discussing the extent of the release of heavy metals yard. The result il- lustrates that the amount of chromium, copper and lead emission account to 43.9%, 13.6~ and 18.2% respectively in the stack; most of heavy metals exist as the residual form. The ecological risks of surrounding agricultural region with these heavy metals were assessed with Hakansons＇s potential ecological harmfulness index, the results indicate that the ecological harm of Cr, Cu and Pb were marginal.