柴窝堡湖表层底泥重金属污染评价

研究了乌鲁木齐市柴窝堡湖表层底泥的重金属含量,并采用Hakanson潜在生态危害指数法对底泥中的重金属潜在生态风险进行评价。结果表明:底泥中Cu、Zn、Pb、Cd含量均超出乌鲁木齐市土壤背景值。除湖心区外,Cd在5个监测区域中的潜在生态危害均为中等;其它重金属在5个采样点的潜在生态危害均为轻微。各重金属间的相关性分析表明,Zn与Cu,Pb与Cd、Cu呈显著正相关,说明这4种元素污染源可能相同。柴窝堡湖表层底泥受到Cu、Zn、Pb、Cd污染,需采取相应措施防止重金属由底泥进入水相。

Pollution Evaluation of Heavy Metals in Superficial Sediment of Chaiwopu Lake Urumqi

The content of heavy metals in superficial sediment of Chaiwopu Lake was studied, and Hakanson＇s Potential Ecological Risk Index was used to assess the potential ecological risk of heavy metals in superficial sediment.Mean concentration of Cr, Cu, Zn, Pb, Cd, As, Hg are measured. Cu, Zn, Pb, Cd were higher than that in background soil of Urumqi. The content of Cd in superficial sediment of Chaiwopu Lake had already reached the level of medium ecological harm. The ecological risk of the other heavy metals is slightly. According to the correlation analysis of various heavy metals, there was a remarkable correlation between Pb, Cd and Cu, Zn and Cu which suggested they might have the same origin. Therefore, the superficial sediments in Chaiwopu Lake are polluted by heavy metal such as Cu, Zn, Pb and Cd.