长江口南支重金属分布研究

对长江口南支采集的水样、悬沙和表层沉积物中的重金属含量进行了分析。结果表明，悬浮物中重金属含量高于表层沉积物，且2者远高于水相中重金属含量。大多数重金属元素间都有良好的相关性。水相中重金属含量由内向外呈轻微的浓度变化；悬浮物中重金属含量逐渐降低；表层沉积物中重金属含量向长江口外有降低趋势，介在长江口门处出现高浓度。河口重金属的分布受到离子交换、吸附、解吸、释释以及水动力等诸多因素的影响。

Study on Heavy Metals Distribution in the South Branch of Changjiang Estuary

Based on the data collected during water environmental survey in June 1994, distribution of heavy metals in water, suspended particulate matters and surficial sediments have been studied in the south Branch of Changjiang Estuary. Concentrations of heavy metals in suspended sediments were higher than those in surficial sediments. Both of them outclassed those in water. Most of heavy metals in surficial sediments were closely related each other,change of heavy metal concentration in water was not remarkable. Particulate heavy metal concentration decreased forward sea, but high value appeared at the river mouth. Distribution of heavy metals were affected by several factors, such as ionic exchange, adsorption, desorpotion, dilution and dynamics.