摘要
为了解磁湖流域重金属污染空间分布及其生态风险,以磁湖为研究对象,对南北磁湖底泥浮泥层(表层)中6种重金属含量进行了测定。利用地质累积指数([Igeo])、单因子污染指数(Pi)和潜在生态风险指数(RI)对6种重金属Pb、Cd、Zn、Cr、Cu和Ni的污染水平及其潜在生态风险进行评价,并通过Pearson相关性分析对金属元素的来源进行探究。结果显示,在北磁湖中重金属的污染程度从大到小的顺序依次是:Cd>Pb>Zn>Cu>Cr>Ni;在南磁湖重金属元素的污染程度从大到小的顺序依次是:Cd>Cu>Zn>Pb>Ni>Cr。重金属Cd在南北磁湖中的污染程度都最为严重,其在流域范围内都有极高的生态危害程度。整体来看,南磁湖南岸在采样点S4和S5的重金属污染情况极为严重,而北磁湖重金属污染较重的情况主要位于西部。Pearson相关性分析的结果显示,北磁湖中除Zn-Cd、Ni-Cr、Cu-Cr和Ni-Cu之间存在显著相关性以外,其它重金属之间均无显著相关性,可能属于自然来源。而南磁湖的沉积物中6种重金属之间具有极高的相关性,说明在南磁湖沉积物中的重金属污染具有同源性。
This study determined six heavy metal contents in the floating mud layer(surface layer) of sediment in the north and south Cihu Lake to investigate the spatial distribution and ecological risk of heavy metal pollution in the Cihu Lake catchment. We evaluated the pollution and the potential ecological risks of Pb,Cd,Zn,Cr,Cu,and Ni based on the matrix,including the Geo-accumulation Index(Igeo),Single-factor Index Method(Pi),and Hakanson Potential Ecological Risk Index(RI),and explored the sources of metal elements with Pearson correlation analysis. The heavy metal pollution ranks by the degree of impact as Cd>Pb>Zn>Cu>Cr>Ni and Cd>Cu>Zn>Pb>Ni>Cr in the north and south of Cihu Lake,respectively,among which Cd pollutes most seriously in both lakes,profoundly arousing ecological damage in the basin. Besides,severe pollution appeared in the sample sites of S4 and S5 on the south bank of south Cihu Lake,while the pollution in the north Cihu Lake worsened in the west. Pearson correlation analysis showed no significant correlation between the heavy metals except Zn-Cd,Ni-Cr,Cu-Cr and Ni-Cu,which might be from natural sources. However,there is a high correlation between the six heavy metals in the sediments of Nancihu Lake,indicating the homology of the heavy metal pollution in the sediments of Nancihu Lake.
作者
张宁
潘超
肖婧
林晨宇
Zhang Ning;Pan Chao;Xiao Jing;Lin Chenyu(Wuhan Wushui Eco-hydraulic Engineering&Technology Co.,Ltd,Wuhan Hubei 430070,China;College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing Jiangsu 210098,China)
出处
《环境与发展》
2022年第9期68-78,共11页
Environment & Development
关键词
磁湖
重金属分布
污染评价
Cihu Lake
Distribution of heavy metals
Pollution assessment
