绿华海上散货减载平台附近海域沉积物重金属风险评估

根据2012年绿华减载平台附近海域春、夏、秋三个季度沉积物监测结果分析评价表明:(1)该海域沉积物中汞(Hg)、砷(As)、铜(Cu)、铅(Pb)、镉(Cd)、铬(Cr)6种重金属元素含量均符合《海洋沉积物质量》第一类标准值;铁(Fe)元素含量相比2006年明显升高。(2)地积累指数法和潜在生态危害指数法评价结果均显示,重金属Hg、As、Pb、Cr均未受到污染,Cu受到轻微污染,而Cd受到中等程度及以上污染,2种方法的评价结果一致性较好。(3)潜在生态危害指数法评价结果显示,重金属Hg、As、Cu、Pb和Cr为低等程度潜在生态危害,而Cd为较高程度潜在生态危害。该海域沉积物6种重金属的综合潜在生态危害属于中等程度。(4)讨论了不同背景参比值对评价结果的影响,表明采用合适的背景参比值,对沉积物重金属评价具有重大意义。

The risk assessment of heavy metals in surface sediments near Lvhua offshore bulk unloading platform

Based on sediment monitoring results of the sea area around Lvhua relieving platform in spring, summer, autumn of 2012, this paper educes the following conclusion :(1)In this area, the content of mercury(Hg),arsenic(As),cooper(Cu),lead(Pb),cadmium(Cd) and chromium(Cr) accorded with the first class evaluation criterion in the marine sediment quality; Compared with 2006,the content of iron(Fe) increased significantly.(2)Both evaluation results of the geoaccumulation index and the potential ecological risk index led to the same conclusion that Hg, As, Pb and Cr were not contaminated, while Cu was slightly polluted and the situation of Cd was even worse.(3)According to the potential ecological risk index evaluation ,for potential ecological hazards, Hg, As, Cu, Pb and Cr were of low levels while Cd was of higher degree. The comprehensive potential hazards of the above 6 kinds of heavy metal were of moderate levels in this area.(4) The discussion of different effects with various background parameters indicated that an appropriate choice of parameters was of great meaning in heavy metal pollution assessment.