Environmental Risk Analysis of Soil and Groundwater Around a Pb-Zn Concentrator and Tailings Pond in Southwest China
In order to investigate the environmental risk of soil and groundwater in the surrounding areas of a lead-zinc mine and tailings reservoir in southwest China,8 heavy metals,including Cd,Hg,As,Pb,Cr,Cu,Ni and Zn,were detected and analyzed in 14 surface soil,5 groundwater,3 surface water and 3 sediment samples.The single factor pollution index method,Nemerow index method and potential ecological risk index method were used for evaluation.The results showed that the soil was contaminated by Cd,Pb,Cu and Zn.The evaluation re-sults of Nemero index showed that the contamination level of soil samples was alarming.The proportion of light pollution and heavy pollution was 7.1％,28.6％and 64.3％,respectively.The potential ecological risk level showed that heavy metal pollution was mainly a medium ecological risk.Arsenic in groundwater exceeds stand-ards.The surface water heavy metals did not exceed the standard,and the sediment Cd,Pb and Zn exceeded the standard and were enriched downstream.Combined with the location of the super standard point,it is speculated that the main cause of soil super standard may be related to the dust from the tailings pond and the waste gas e-missions from the concentrator.It is recommended that land use-based remediation and risk management be im-plemented to ensure safe use of soil.
Pb-Zn concentratorsoilheavy metalsNemerow index methodpotential ecological risk index method
NETL
NSTL
万方数据
