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.