饶河入鄱阳湖口处沉积物中重金属的含量及空间变化

Contents and Spatial Variation of Heavy Metal in Sediment at Inlet of Raohe River to Poyang Lake

饶河是鄱阳湖流域的五大水系之一,是鄱阳湖流域重金属污染最严重的区域之一。本文对鄱阳湖饶河入湖段设置了3个采样点,对采样点中的底泥样品进行了重金属元素Cu,Pb,Zn的分析与测定,用原子吸收法测定了柱状样沉积物中重金属的含量,分析了各元素在各采样点的空间分布特征。分析结果表明:各重金属含量的垂直分布特征由于受沿岸不同污染源的影响,重金属污染物难以形成一定规律的分布状态,总体上呈波折型分布;该区域底泥中重金属的分布受水流的影响较大;各元素之间呈现出一定的相关性,即Cu,Zn2种元素之间呈极显著正相关,这表明在鄱阳湖饶河入湖段呈现出重金属复合污染的趋势。

Raohe is one of the five river systems and the most serious heavy metals contaminated areas of Poyang lake valley. For the environmental protection purpose, sediment samples from 3 different locations in Raohe river of Poyang lake were collected. The heavy metal contents of Cu, Pb and Zn in core sediments were analyzed in order to study the geochemical characteristics, contamination features and the spatial and vertical distribution characters for heavy metals of estuary in Raohe basin. The results show that heavy metal pollutants have no regulation in vertical distribution which is twist and turn type generally because of the influence of different pollution sources along the bank. The distribution of heavy metals is effected by water flow. Obvious positive correlation between Cu and Zn reflects a complex contamination trend of heavy metals in estuary in Raohe basin.