二道松花江沉积物重金属特征及其潜在生态风险

为了查明第二松花江河源区水体环境状况,通过测定二道松花江及其主要支流沉积物中重金属元素As、Cd、Cr、Cu、Hg、Pb、Zn的质量分数,探讨了沉积物中的重金属浓度特征,并采用潜在生态风险指数法对该河流沉积物中重金属的潜在生态风险进行了评价。结果表明:二道松花江及其主要支流沉积物中重金属元素分布不均匀,As、Cd、Cr、Cu、Hg质量分数平均值分别为4.47×10-6、0.158×10-6、35.81×10-6、10.57×10-6、0.040×10-6,总体处于较低水平;沉积物中重金属潜在生态风险总体上处于轻微生态危害程度,但在金银别河处于极强生态危害程度,以Hg的生态风险为主。

Characteristics and Potential Ecological Risk of Heavy Metals of Sediments in Erdaosonghua River

In order to investigate the water environment of the Second Songhua River,based on analyzing the content of heavy metals(As、Cd、Cr、Cu、Hg、Pb、Zn)of the sediment in Erdaosonghua River and its tributary,the characteristics of heavy metals were discussed,and the potential ecological risks of heavy metals in sediment were assessed by the method of potential ecological risk index.The results show that the content of heavy metals (As 4.47×10-6,Cd 0.158×10-6,Cr 35.81×10-6,Cu 10.57×10-6,Hg 0.040×10-6)in sediment is relatively low,with uneven distribution.The potential ecological risks of the heavy metals in sediment of Erdaosonghua River belong to"slight"level;while the risk level is even high in Jinyinbie River,with mercury as the primary risk.