湘江流域长株潭段底泥重金属污染评价

Investigation on Heavy Metal Pollution of Sediments in Xiangjiang River in Changzhutan

在湘江长株潭段共采集了6个底泥样品,监测了Cu、Pb、Zn、Cd、Ni、Cr、As、Hg8种重金属元素,采用地积累指数法和潜在生态危害指数法对湘江长株潭段底泥重金属污染进行评价。结果表明:湘江长株潭段底泥受重金属污染较严重,各种重金属的污染程度由强至弱依次为Cd>Zn>Cu>Pb=Ni>Hg>As=Cr;金属污染物对湘江长株潭段构成的潜在生态危害由强至弱依次为Cd>Hg>Pd>Cu>Zn>As>Cr,其中Cd的影响占主导地位。对于评价效果,地积累指数法和潜在生态危害指数所反映的情况有所差异,原因主要是参比体系及参比值的差异。

6 sediments speciments were sampled from Xiangjiang River based on the distribution of industrial park for analyzing Cu,Pb,Zn,Cd,Ni,Cr,As,Hg.The potential ecological risk index and the index of geoaccumulation were used to evaluate the contamination level of heavy metals in the sediments.The results showed that the sediments of Xiangjiang River in Changzhutan had been seriously polluted by heavy metals.The orders of the degree of contamination and potential ecological risk were CdZnCuPb=NiHgAs=Cr and CdHgPdCuZnAsCr,among which Cd was the prediment factor.There was different between the result of the potential ecological risk index and the index of geoaccumulation,which was due to the difference of reference value and reference system.