典型河流表层底泥重金属污染现状与评价

运用Hakanson的生态风险指数法,对湘江株洲段丰、平水期和枯水期采集的72个表层底泥样品进行分析,评价重金属Pb、Zn、Cd、Cr、As及Hg对河流水域的污染程度及其对河流造成的潜在生态风险影响。结果表明:从朱亭断面到白石断面枯水期底泥重金属污染程度较丰、平水期低;底泥疏浚后霞湾断面底泥中的重金属在短时期内得到控制,但是一段时间后重金属污染仍然存在。湘江株洲段各采样断面污染程度排序为:马家河断面>霞湾断面>白石断面>一水厂断面>枫溪断面>朱亭断面。各断面表层底泥总的潜在生态风险程度都达到了重度或者严重的强度。

Circumstance and Assessment upon Heavy Metals Pollution in Surface Sediment of Typical River

The paper aims to assess the pollution level and potential eco-risk of heavy metals,including Pb,Zn,Cd,Cr,As and Hg,upon waters of rivers and rivers itself.Result of this research,by means of applying analysis of Hakanson eco-risk Index to 72 surface sediments collected during the periods of high water,concerning the section areas between Zhuting and Baishi,heavy metals pollution in sediment during low water period is less than that in the period of high water and flat water.Heavy metals in sediment of Xiawan section are controlled well in a short time after being dredged,yet later the pollution remains.In short,all of the waters collected in different sections of Xiangjiang River are badly polluted and for some sections,situation is even worse.Specifically,Majia River is the most heavily polluted section,followed by Xiawan,Baishi,Yishuichang,Fengxi and Zhuting in this regard.