天津市七里海滨海湿地沉积物重金属元素的空间分布特征

摘要

The paper analyses 6 kinds of heavy metal elements in surface sediment of Qilihai-wetland, results showed:the contents of Cu, Zn, Pb, As, Cd were relatively stable, Hg was unevenly distributed. The richness of heavy metals in the wetland was divided into normal, slightly high and moderately high, the order of richness was Cd>Cu>Zn>Pb>Hg>As. As was between the normal and poor. Cu, Zn, Pb, Hg were slightly high, indicating a slight pollution in the wetland. Cd was moderate high, indicating a moderate pollution.%对七里海滨海湿地沉积物6种重金属元素进行系统分析，结果表明Cu、Zn、Pb、As、Cd 5种元素在沉积物中含量相对稳定，Hg元素在湿地沉积物中分布不均匀，变化较大。富集度分析表明，七里海滨海湿地重金属富集度划分为元素适中、轻度富集、中度富集3个级别，元素富集程度依次为Cd＞Cu＞Zn＞Pb＞Hg＞As，As元素基本介于元素适中和元素贫乏之间， Cu、Zn、Pb、Hg 4种重金属达到了轻度富集，说明该区已受到轻度污染，Cd元素已到达中度富集，说明该区已受到中度污染，应引起重视。