物探与化探2024，Vol.48Issue(3)：847-857,11.DOI:10.11720/wtyht.2024.1313
典型汞矿区周边耕地土壤重金属来源解析与农作物健康风险评价
Sources of soil heavy metals and health risk assessment of crops in arable land at the periphery of a typical mercury mining area
摘要
Abstract
This study aims to systematically assess the pollution risk of heavy metals in the soil-crop-human body system along the pe-riphery of mining areas,thus providing a scientific basis for the classified management of ecological risks and safe crop production in mining areas.Hence,this study examined the soil and crops(rice,corn,and sweet potato)in arable land along the periphery of a typical mercury mining area in Chongqing City.The single-factor pollution index(Pi),Nemero composite index(P综),and positive matrix factorization(PMF)model were employed to assess the pollution degree and ecological risk of soil heavy metals for source analy-sis.Moreover,the human health risk assessment model recommended by the United States Environmental Protection Agency(USEPA)was applied to assess the health risks of local staple crops for residents.The results are as follows:(1)The average contents of As,Cd,Cr,Cu,Hg,Ni,Pb,and Zn in the soil of the study area were all higher than the topsoil background values of Chongqing and China,suggesting that heavy metals are relatively enriched in topsoil;(2)The single-factor pollution index indicates that the over-limit ratios of Hg and Cd in the soil reached 96.29%and 92.59%,respectively,whereas rice,corn,and sweet potato samples with Cd con-tent exceeding the value specified in the national food safety standard(GB 2762-2022)accounted for 16.67%,18.75%,and 14.28%,respectively;(3)The Nemero composite index(P综)was between 1.17 and 46.05,suggesting mild to heavy pollution in the study area,with heavy pollution primarily located around the mercury mining area and artisanal mercury smelters,as well as the lower reaches of the Rongxi River;(4)The PMF model analysis demonstrates that the heavy metals in the soil of the study area origi-nate from three sources:natural source(47.21%),mining activities(16.00%),and a mixed source of mining and agricultural activ-ities(36.79%).Specifically,Cd,Cr,and Ni are principally affected by the natural source,Hg by mining activities,As and Pb by the mixed source of mining and agricultural activities,and Cu and Zn are associated with the natural source and the mixed source of mining and agricultural activities;(5)The human health risk model reveals that the consumption of rice,corn,and sweet potato poses composite health risks for both adults and children.Rice consumption exhibits the highest risk index,especially in children,with the main risk factors being As and Cd.关键词
汞矿区/重金属/土壤—农作物/来源分析/健康风险评价Key words
mercury mining area/heavy metal/soil-crop/source analysis/health risk assessment分类
资源环境引用本文复制引用
余飞,王锐,周皎,张风雷,蒋玉莲,张云逸,朱世林..典型汞矿区周边耕地土壤重金属来源解析与农作物健康风险评价[J].物探与化探,2024,48(3):847-857,11.基金项目
重庆市地质矿产勘查开发局川东南地质大队2023年度自立科研项目(CDNKY-2023003) （CDNKY-2023003）
