三峡水库135 m水位蓄水前后水体中重金属分布变化

以朱沱、寸滩(上游区)、清溪场(回水变动区)、万州(库区)4个断面为代表分析了三峡水库135m水位蓄水后4种重金属的水平分布规律.结果表明:库区、回水变动区、上游区总Pb、总cu、总cd含量成库后＞成库前,成库前后沿库区→上游区方向逐渐增大;可溶态Pb含量成库前＞成库后.成库前沿库区→上游区有增大的趋势,成库后表现为减小的趋势;可溶态Cu含量除朱沱外,其余断面成库后＞成库前;可溶态Cd含量成库前后变化不明显.成库前后水体中可能存在Pb、Cd复合污染和Pb、Cu复合污染以及Cu、Cd复合污染.

Changes of Heavy Metals Distribution in Water Body of the Three Gorges Reservoir at 135 m Water Level

Horizontal distribution of the 4 heavy metals before and after the water level reached 135 meters were analyzed,taken Zhutuo,Cuntan(upriver area),Qingxichang(fluctuating backwater area),Wanzhou(reservoir area) as representatives.The result indicated that concentration of total Pb,total Cu,total Cd had augment trend after the water level reached 135 meters.Concentration of dissolvable Pb had augment trend before the water level reached 135 meters,and had depressed trend after the water level reached 135 meters.Dissolvable Cu(except Zhutuo) had augment trend in the other monitoring sites after the water level reached 135 meters.Dissolvable Cd had no significant differences before and after the water level reached 135 meters in different monitoring sites.There might be Pb,Cd complex pollution and Pb,Cu complex pollution and Cu,Cd complex pollution before and after the water level reached 135 meters.