皖南典型区耕地土壤重金属富集特征、来源识别及健康风险评估  

Enrichment characteristics,source identification,and health risk assessment of soil heavy metals in typical cultivated land in the mountainous area of southern Anhui Province

作　　者：杨艳[1] 刘彬 夏飞强 陈平峰 张祥 YANG Yan;LIU Bin;XIA Fei-Qiang;CHEN Ping-Feng;ZHANG Xiang(Anhui Institute of Geophysical and Geochemical Prospecting Techniques,Hefei230022,China)

机构地区：[1]安徽省地球物理地球化学勘查技术院,安徽合肥230022

出　　处：《物探与化探》2024年第1期255-263,共9页Geophysical and Geochemical Exploration

基　　金：安徽省公益性地质工作项目(2016-g-3-11)。

摘　　要：为探讨安徽省皖南山区典型耕地土壤重金属富集特征及成因,以安徽省东南部宁国市为研究对象,在耕地中采集1399件表层土壤样品,测定As、Cd、Hg、Pb、Cr、Ni、Cu、Zn元素含量,运用相关分析、土壤环境质量农用地土壤污染风险、地质累积指数、健康风险指数及PMF(正定矩阵因子分解)模型方法开展重金属风险评价及来源识别。结果显示:As、Cd、Hg、Pb、Cr、Ni、Cu、Zn含量的平均值分别为:15.8×10^(-6)、0.41×10^(-6)、0.106×10^(-6)、31×10^(-6)、67×10^(-6)、29.00×10^(-6)、29×10^(-6)、94×10^(-6),除Ni外,其他元素均高于安徽省背景值;重金属土壤污染风险水平整体较低,有866件土壤样品重金属含量低于风险筛选值;地质累积指数结果表明,耕地土壤主要受到Hg、Cd、As污染;健康风险评估结果显示,研究区内成人非致癌与致癌风险水平均在可接受范围内;基于PMF模型,确立了研究区重金属4种来源:与人类活动相关的工农业排放源、大气沉降源、与土壤类型相关的成土母质源和地质背景源。This study aims to explore the enrichment characteristics and origin of soil heavy metals in typical cultivated land in the mountainous area of southern Anhui province.With Ningguo City in southeastern Anhui Province as the research object,this study col-lected 1399 topsoil samples in the cultivated land for determining the concentrations of As,Cd,Hg,Pb,Cr,Ni,Cu,and Zn.Fur-thermore,this study conducted a health risk assessment and source identification of heavy metals using the correlation analysis,the soil environmental quality-risk control standard for soil contamination of agricultural land,the geoaccumulation index,the health risk in-dex,and the positive matrix factorization(PMF)model.The results are as follows:(1)The average concentrations of As,Cr,Hg,Pb,Cr,Ni,Cu,and Zn were 15.8×10^(-6),0.41×10^(-6),0.106×10^(-6),31×10^(-6),67×10^(-6),29×10^(-6),29×10^(-6),and 94×10^(-6),respec-tively,which were all higher than their background values in Anhui Province,except Ni.(2)The soil heavy metals generally exhibited low pollution risks,with the heavy metal concentrations of 866 soil samples lower than their risk screening values.(3)The cultivated soil was primarily polluted by Hg,Cd,and As,as indicated by the geoaccumulation index results.(4)Both non-carcinogenic and car-cinogenic risk levels in adults in the study area were within the acceptable ranges,as revealed by the health risk assessment results.(5)Four sources of heavy metals in the study area were identified based on the PMF model:industrial and agricultural emissions asso-ciated with human activities,atmospheric deposition,soil parent materials related to soil types,and the geological background source.

关 键 词：耕地 土壤重金属 健康风险 PMF模型 

分 类 号：X142[环境科学与工程—环境科学] X825