渤海湾西部海域表层沉积物重金属含量分布与评价

The concentration distribution and evaluation of the heavy metals in the surface sediments of western Bohai Bay

通过分析测定渤海湾100个站位表层沉积物中重金属元素的含量,探讨其分布特征及富集状况,并通过地累积指数法和潜在生态危害指数法对渤海湾西部岐口凹陷海域底质环境进行了评价。结果表明:渤海湾西部海域表层沉积物中As、Hg、Cu、Pb、Cd的平均含量分别为12.9×10^(-6)、0.031×10^(-6)、29.5×10^(-6)、27.4×10^(-6)、0.159×10^(-6)。结合5种元素的地球化学图及地累积指数法分析表明,研究区表层沉积物整体上未受到As、Hg、Cu、Pb、Cd的污染,而在高值区Pb和Cu达到轻度污染的水平;潜在生态危害指数法的评价结果指明,重金属元素的潜在危害程度顺序是Hg>Cd>As>Pb>Cu,研究区重金属的潜在生态危害轻微,只有在高值区,Hg和Cd才达到中等程度的生态危害。

Values of heavy metals from the 100 surface sediment stations in western Bohai Bay were determined,and two methods were used to evaluate the sediment environment. The results show that the average values of As,Hg,Cu,Pb,Cd in the surface sediments are 12.9×10^-6,0.031×10^-6,29.5×10^-6,27.4×10^-6,0.159×10^-6. The indices of geoaccumulation show that,in the high value area,Pb and Cu reach the slight pollution level. The potential ecological risk indices show that Hg and Cd have reached moderate ecological harm,while in the study area,the harm degree sequence of the five heavy metals is Hg Cd AsPb Cu.