摘要
沉积物重金属污染对水生生态系统具有潜在危害。对取自三门湾的10个表层沉积物中的重金属(Cu、Pb、Zn、Cd、Hg、Cr、As)元素进行了分析,探讨了其空间分布,运用Hakanson潜在生态危害指数法,评价了表层沉积物中重金属的富集程度和潜在生态风险。结果表明:三门湾表层沉积物中Cu、Pb、Zn、Cd、Hg、Cr、As等重金属含量分布无明显规律;7种重金属中,以Cr的污染程度最高,平均污染系数为1.30,重金属污染程度由高到低依次是:Cr>Zn>Cu>Pb>As>Hg>Cd;潜在生态危害评价显示,重金属元素的潜在生态危害均属轻微,潜在生态危害程度顺序是Hg>Cd>As>Cu>Pb>Cr>Zn,对三门湾生态环境具有潜在影响的重金属元素主要是Hg。
Heavy metal contamination in surface sediment is harmful to the aquatic ecosystem. In this study, 10 surface sediment samples from Sanmen Bay were collected and analyzed for heavy metals such as Cu, Pb, Zn, Cd, Hg, Cr and As, on an attempt to illustrate their distribution in the fishing harbor, and to assess their accu- mulation levels and potential ecological risks, using Potential Ecological Index（RI） methods. The result showed that the contents of all these heavy metals appear no apparent rule. Among all these heavy metals, the pollution of Cr was most serious with the pollution index 1.30. The pollution degree of these heavy metals in surface sediments followed the order： Cr〉Zn〉Cu〉Pb〉As〉Hg〉Cd. The potential ecological risk of the heavy metals in this area belonged to light. The potential ecological risk of these heavy metals in surface sediments of Sanmen Bay was Hg〉Cd〉As〉Cu〉Pb〉Cr〉 Zn. Hg was the potential impact element for the ecological environment of Sanmen Bay.
出处
《浙江海洋学院学报（自然科学版）》
CAS
2011年第4期318-321,335,共5页
Journal of Zhejiang Ocean University(Natural Science Edition)
基金
国家海洋局公益行业科研专项(200805084)
关键词
三门湾
沉积物
重金属
潜在生态危害评价
Sanmen Bay
sediment
heavy metals
assessment of potential ecological risk
