Spatial distribution characteristics and risk assessment of heavy metal pollution in a typical steel smelting site
A shutdown steel smelter in Shanghai was took as the research object,and 249 soil samples in the surface,middle and deep layers were collected from 83 sampling points to analyze the distribution characteristics,pollution status,potential ecological risk and health risk of six heavy metals(As,Pb,Cd,Ni,Hg and Cu).The sampling points were chosen by professional and systematic layout methods.The results showed that the concentrations of As and Pb in some samples exceeded the standard;Cd and Pb showed strong variation,and the variation of other metals was moderate.The average concentrations of heavy metals showed a trend of gradual decrease from top to bottom in vertical distribution,and the highest concentrations were all distributed in the surface soil.Heavy metals were mainly enriched in the slag removal room,steel slag treatment area and scrap steel batching room.The evaluation results of the ground accumulation index showed that some samples of Cd and Pb were extremely severely polluted,the proportion of samples with severe pollution or above was 8.43％and 3.61％,respectively.The evaluation of potential ecological risk showed that the overall ecological risk of the site was high,with Cd as the main contributing factor and 51.81％of the samples with relative high risk or above.Health risk assessment showed that Pb,As and Cd might pose health risk to human,thus it was necessary to carry out soil management or remediation to ensure the redevelopment and utilization of the site.
steel smelting siteheavy metal pollutionspatial distributionecological riskhealth risk assessment
NETL
NSTL
万方数据
维普
