摘要
为研究淮北煤田宿南矿区土壤重金属含量特征,测试了土壤中重金属Fe、Mn、Cd、Cr、Pb、Ni、Zn和Cu的含量,采用地累积污染指数法和潜在生态风险指数法对土壤重金属污染进行评价,并运用多元统计分析对重金属污染来源进行解析。结果表明,Cd、Cr、Pb、Ni、Zn和Cu的均值含量不超过土壤环境质量二级标准;综合评价结果显示,Cd污染累积程度明显,且Cd是最主要的生态风险因子;聚类分析将重金属划分为具有相似地球化学过程的3组,即Ⅰ类(Fe、Ni和Pb)、Ⅱ类(Mn、Cu和Cd)和Ⅲ类(Zn和Cr);主成分分析从重金属元素中筛选出3个主成分(PC1、PC2和PC3),PC1(Mn、Cu和Cd)表示为煤矿开采与道路煤尘扩散污染,PC2(Fe、Ni和Pb)解析为土壤母质与尾气排放作用,PC3(Zn和Cr)表示交通运输与农业生产活动污染。
To study soil heavy metal content characteristics in Sunan mining area of Huaibei coalfield,contents of Fe,Mn,Cd,Cr,Pb,Ni,Zn and Cu in surface soil samples were analyzed.Geoaccumulation index and potential ecological risk index method were used to evaluate soil pollution degree respectively,and multivariate statistical analysis was applied to examine the sources of soil heavy metals.Results show that the mean contents of Cd,Cr,Pb,Ni,Zn and Cu are not exceeding the national secondary standard of environment quality for soil at all.Comprehensive evaluation results indicate that Cd pollution accumulation is obvious,and Cd is the main ecological risk factor.Cluster analysis sorts heavy metals into Group Ⅰ（Fe,Ni and Pb）,Group Ⅱ （Mn,Cu and Cd） and Group Ⅲ （Zn and Cr）,and elements in each group are extreme similar in geochemical process.Principal component analysis identifies 3 principal components（PC1,PC2 and PC3）from the heavy metals,PC1（Mn,Cu and Cd）is representative of mining and road dust pollution,PC2 （Fe,Ni and Pb）is representing soil parent materials and tail gas emissions,and PC3 （Zn and Cr）belongs to transportation and agricultural production pollution.
出处
《地球与环境》
CAS
CSCD
2017年第5期546-554,共9页
Earth and Environment
基金
国家自然科学基金项目(41373095
41173106)
安徽高校自然科学研究重点项目(KJ2017A445)
宿州学院优秀青年人才支持计划资助项目(SZXYQNL2017002)
关键词
宿南矿区
土壤重金属
含量特征
评价
来源
Sunan mining area
soil heavy metal
content characteristics
evaluation
source
