1998年特大洪水期长江口南汇嘴水域重金属元素的分布特征

该文根据１９９８年９月长江口南汇嘴水域综合调查,探讨了该水域Ｃｒ,Ｍｎ,Ｆｅ,Ｃｕ,Ｚｎ,Ｃｄ,Ｐｂ七种重金属元素和Ａ１的空间分布,通过计算和图表分析后认为：水相中高含量重金属元素就平面分布而言,长江口口门区大于口内区及口外区而小于杭州湾北岸,垂向上则表现为随着水深的增大而增加的态势,而这种分布态势主要取决于水体中悬浮颗粒的浓度。低含量重金属元素的分布为口门区大于杭州湾北岸,固相重金属元素具有平面

The Distribution Character of Heavy Metal Elements over Nanhuizui Water Area of Yangtse Estuary in the Period of Catastrophic Flood, 1998

The paper deal with the distribution of seven hea vy metal elements (Cr, Mn, Fe, Cu, Zn, Cd, Pb) and Al over the Nanhuizui water are a of Yangtse Estuary based on the synthetical survey of this waters in Sep., 19 98. The results show that as plane distribution is concerned, the concentration of highly contented elements in water phase at the mouth is higher than that ins ide and outside of the mouth but lower than north bank of the Hangzhou Bay, whic h mostly depends on the concentration of suspended sediment. The concentration o f the lowly contented elements is higher in mouth area than in north bank of the Hangzhou Bay. On the other hand, their concentration all increase with water de pth. On the contrary, their distribution in solid phase is of quasihomogeneity w ith very little change in plane and on bottom layer being slightly less than on surface layer, which mainly result not only from the fact that the suspended sed iment of this area all come from the Yangtse River but also from their adsorptio n and anti-adsorption property. Furthermore, through contrast with historical ma terial, it shows that this catastrophic flood remarkably diluted these heavy met als in water phase, compared with the same period of normal years, they were all diluted more than six tenths. The distribution of the heavy metal elements of this waters has close relationsh ip with its suspended sediment distribution and estuarine front activities.