淀山湖沉积物中重金属元素分布特征及其季节变化

Heavy metals Partitioning and Seasonal Variation in Lake Sediments

分别于夏冬两季采集淀山湖表层柱状沉积物样品,分析了沉积物样品中Cd、Pb、Cu、Cr、Fe和Mn的总量分布特征,用Tess-ier连续提取法,系统地对沉积物中重金属元素的形态分布进行了研究,并初步探讨了重金属元素分布特征的季节变化的原因。结果表明:沉积物中Pb的总量存在季节变化;沉积物中Cd、Cu、Cr和Fe主要存在于残渣态中,但Pb的铁锰氧化物结合态与Cu的有机质-硫化物结合态均为各自的优势结合态;Mn主要以可交换态、铁锰氧化物结合态及残渣态存在;Cd、Pb、Cu、Cr、Fe和Mn各形态含量均存在季节变化,其总量及各形态含量的变化与温度、pH、Eh等有关。

Sediments sample of Dianshan Lake was collected in summer and winter to analyze partitioning of heavy metals such as Cd,Pb,Cu,Cr,Fe and Mn by Tessier extraction procedure and reasons of seasonal variation were analysed.Results showed that seasonal variations occurred for various speciations of heavy metals,and the variations related with temperature,pH and Eh.