Distribution characteristics of heavy metal elements and pollution evaluation of sediment in Hengshui Lake
Taking the sediment of Hengshui Lake as the research object,14 sampling points were arranged for sampling and testing,and the distribution characteristics of 8 heavy metal elements(As,Hg,Cd,Cr,Pb,Ni,Cu,Zn)in the sediment were analyzed,and the single pollution index method and the Nemero pollution index method were used to evaluate the degree of heavy metal pollution in the sedi-ment.The results showed that As,Pb,Ni and Cu elements were high in the east and north of the lake.The content of Cd,Cr and Zn ele-ments was higher in the northern part of the lake.Hg was found in high concentrations in the eastern part of the lake.The evaluation of a single pollution index showed that only the heavy metal elements Cd and Zn were polluted,and the pollution degree was mild pollution and light pollution respectively,and the remaining six elements were clean.The comprehensive evaluation index of Nemero showed that there was light pollution of heavy metals in the sediment of Hengshui Lake(Y3 position),the polluted elements were Cd,Zn,and other areas were clean.The correlation analysis of 8 heavy metals in the sediment showed that the positive correlation between Cd and Zn was the most significant(P＜0.01),indicating that the contaminated elements had homology.The results can provide scientific basis for the prevention and control of heavy metal pollution and ecological restoration in Hengshui Lake.
sedimentheavy metal elementsdistribution characteristicspollution evaluationHengshui Lake
万方数据
维普
