青草沙水库底泥重金属含量分析与评价

Analysis and Evaluation of Heavy Metals in Sediment from Qingcaosha Reservoir

对青草沙水库底泥中的重金属Ni、Cd、Cu、Pb、Zn含量进行分析与评价。结果表明,青草沙库区内五种重金属在不同采样点位的浓度分布趋势是基本一致的,其中库尾的1#、2#点位呈现出略高的浓度。采用地累积指数法、潜在生态危害指数法对底泥重金属污染进行评价,Cd相较于其他重金属元素表现出较高的污染程度和潜在生态危害。采用沉积物质量基准法进行评价,Cd在部分点位偶尔会引起不利生物毒性效应,而重金属Ni在所有点位均会产生不利生物毒性效应。

Concentrations of heavy metals Ni, Cd, Cu, Pb and Zn in the sediment of Qingcaosha Reservoir were analyzed and evaluated. Results showed that concentration distribution of heavy metals in different parts of the Qingcaosha Reservoir was basically the same, and the 1# and 2# areas showed a slightly higher concentration. The evaluation of heavy metal pollution in sediments by geological accumulation index and potential ecological risk index method showed that Cd exhibited higher pollution degree and potential ecological risk than other heavy metals. Evaluation with sediment quality guidelines method showed that Cd occasionally caused adverse biological toxicity at some points, while heavy metal Ni produced unfavorable biological toxicity effects at all points.