摘要
厘清矿区重金属污染特征对矿山污染防治与生态修复具有重要指导意义.以四川省西南部铅锌矿区为研究对象,运用地累积指数法评价区域重金属污染程度,采用克里金插值法模拟区域重金属污染范围,综合运用Pearson相关性分析、主成分分析(PCA)定量解析污染源及污染贡献情况.结果表明,研究区土壤Pb、As最大值超过《土壤环境质量建设用地土壤污染风险管控标准(试行)》(GB 36600-2018)中第二类用地风险筛选值,研究区内局部区域土壤受到较为严重的Cd、Pb、Hg、Zn污染.铅锌矿开采、洗选及冶炼等生产活动是导致研究区域内Cd、Pb、Zn、As和Cu污染的首要因素,贡献率达到41.9％.
Abstract
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％.
基金项目
中煤地华盛水文地质勘察有限公司科技项目(2023-16-专题二)
NETL
NSTL
万方数据