Spatial distribution characteristics and source analysis of heavy metal pollution in soil in the lead-zinc mining area in southwestern Sichuan Province
Clarifying the characteristics of heavy metal pollution in mining areas has important guiding significance for mine pollution prevention and ecological restoration.Taking the lead-zinc mining area in southwestern Sichuan Province as the research object,this paper used the geoaccumulation index method to evaluate the regional heavy metal pollution level,the Kriging interpolation method to simulate the regional heavy metal pollution range,and Pearson correlation analysis and principal component analysis(PCA)for quantitative analysis of pollution sources and pollution contribution.The results showed that the maximum values of soil Pb and As in the study area exceeded the screening values for the second type of land in the"Soil environmental quality-risk control standard for soil contamination of development land"(GB 36600-2018),and the soil was seriously contaminated by Cd,Pb,Hg and Zn,part of the study area were particularly polluted.Lead-zinc ore production activities such as ore mining,washing and smelting were the primary factors leading to Cd,Pb,Zn,As and Cu pollution in the study area,and their pollution contribution efficiency reached 41.9％.
lead-zinc minesoil heavy metalsspatial distributionsource analysis
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