城市工业地块土壤重金属污染风险评价与源解析OA北大核心CSTPCD

The research area selected is Jinshan District,Shanghai.Based on 168 soil samples from 25 different depth profiles of redevelopment sites within the study area,the concentrations of heavy metals cadmium(Cd),lead(Pb),copper(Cu),nickel(Ni),mercury(Hg),and arsenic(As)were determined and analyzed.The characteristics of heavy metal pollution were assessed using the Geoaccumulation Index,Nemerow Comprehensive Pollution Index,and Potential Ecological Risk Index.Additionally,the pollution sources were analyzed utilizing geostatistics,correlation analysis,and Absolute Principal Component Scores-Multiple Linear Regression(APCS-MLR)model.Results indicate that,except for As,the concentrations of other heavy metals in the soil exceeded the background values of Shanghai.The concentrations of Cd,Pb,Cu,Ni,and Hg in the surface soil were 2.15,1.61,2.20,2.02,and 1.30 times higher than the background values,respectively.The concentrations of these six heavy metals gradually decreased with increasing soil depth,indicating a certain degree of enrichment in the surface soil due to human activities.Spatial interpolation reveals that high values of Cd,Cu,and Ni were concentrated in the northwest,while high values of Pb and Hg were concentrated in the central part of the study area,with As distributed evenly.The Geoaccumulation Index showed the order of accumulation as Ni(0.37)>Cu(0.36)>Cd(0.29)>Pb(0.11)>Hg(-0.62)>As(-0.85).The Nemerow Comprehensive Pollution Index indicated mild pollution with a value of 1.95.The results of the Potential Ecological Risk Index show that the comprehensive potential ecological risk index(R)in the study area ranged from 50.60 to 271.50,with an average of 153.00,indicating a moderate ecological risk overall.Correlation analysis and the APCS-MLR model identified three main sources of heavy metals in the soil of the study area:Source 1(Cd,Cu,and Ni)was attributed to metal product sources,Source 2(Hg and Pb)to chemical raw materials and chemical product sources,and Source 3(As)to a mixed source mainly from natural origins.This study provides a relatively comprehensive evaluation of soil heavy metal pollution in the redevelopment sites of Jinshan District,Shanghai.It aims to provide evidence-based support for the prevention,control,and remediation of soil heavy metal pollution during the urban renewal process.