淮河沉积物中重金属污染及潜在生态危害评价

Pollution of heavy metals in surface sediments from Huaihe River(Jiangsu section) and its assessment of potential ecological risk

测定了淮河 (江苏段 )表层沉积物中重金属的含量 ,分析了重金属的含量分布及富集状况 ,采用 Lars Hakanson潜在生态危害指数法对重金属的生态危害进行了评价。结果表明 ,各种重金属的含量分布呈现出相似的特点 ,即安徽省进入江苏省境内断面 (肖嘴 )时含量较低 ;在江苏省盱眙县城内断面 (淮河大桥 )含量明显增高 ;汇入洪泽湖前断面 (红光化工厂 )稍高于肖嘴断面。从富集系数来看 ,Pb的富集程度最高 ,其次是 As、Cr、Cd、Zn、Cu;而 Hg的富集程度最低。重金属的潜在生态危害评价显示 ,除淮河大桥断面 Cd的污染属于中等生态危害外 ,其他各点重金属的生态危害都很轻微 ,污染程度顺序为 Cd>As>Hg>Pb>Cu>Zn。

Concentrations, distribution and enrichment of heavy metals in surface sediments from Huaihe River (Jiangsu section) were investigated. The method of potential ecological risk index presented by Lars Ha··kanson was used to assess the ecological risk of heavy metals. The results indicated that the contents distribution of all metals appear similar characteristics, the contents of metals were relatively high in Huaihe River Bridge and low in Xiaozui. Among these metals, the enrichment of Pb appears higher and the others were low. The assessment results of ecological risk revealed except Cd in Huaihe River Bridge belongs to middle potential ecological risk, all the others belong to light potential ecological risk. The order of polluting degree of these heavy metals in surface sediments from Huaihe River (Jiangsu section) is Cd>As>Hg>Pb>Cu>Zn.