浙中典型硫铁矿区农田土壤重金属含量特征及健康风险  

Heavy Metal Concentration Characteristics and Health Risks of Farmland Soils in Typical Pyrite Mining Area of the Central Zhejiang Province, China

作　　者：成晓梦 孙彬彬[1,2] 吴超 贺灵[1,2] 曾道明 赵辰[1,3] CHENG Xiao-meng;SUN Bin-bin;WU Chao;HE Ling;ZENG Dao-ming;ZHAO Chen(Institute of Geophysical&Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang 065000,China;UNESCO International Center on Global-Scale Geochemistry,Langfang 065000,China;College of Earth Sciences,Guilin University of Technology,Guilin 541006,China)

机构地区：[1]中国地质科学院地球物理地球化学勘查研究所,廊坊065000 [2]联合国教科文组织全球尺度地球化学国际研究中心,廊坊065000 [3]桂林理工大学地球科学学院,桂林541006

出　　处：《环境科学》2022年第1期442-453,共12页Environmental Science

基　　金：中国地质科学院地球物理地球化学勘查研究所基本科研业务费(AS2017J14)。

摘　　要：为探明硫铁矿开采对周边农田土壤环境及人体健康的影响,在龙游县硫铁矿区周边采集表层土壤样品(0~20 cm)42件,分析了土壤中8种重金属含量(As、Cd、Cr、Cu、Hg、Ni、Pb和Zn)及pH,采用统计学、地累积指数(I_(geo))、正定矩阵因子分析法(PMF)和健康风险评估模型等方法开展研究区土壤重金属含量特征、来源解析和人体健康风险评价.结果发现,表层土壤中平均ω(Cd)、ω(Cu)、ω(Pb)和ω(Zn)均超过浙江和全国土壤背景值,与农用地污染风险筛选值(GB 15618-2018)相比,土壤样品中Cd、Cu、Pb和Zn的超标率分别为82%、49%、42%和31%.土壤重金属地累积指数(I_(geo))结果显示,研究区污染最严重的是Cd,其次为Cu、Pb和Zn.PMF分析结果表明,研究区重金属来源包括:自然来源(As、Cr和Ni)、重金属地质高背景和成矿地质体开采引起的综合污染源(Cd、Cu、Pb和Zn)及人为来源(Hg),各种来源的综合贡献率占比分别为32%、46%和22%.人体健康风险评估模型显示,土壤Pb是引发非致癌风险的主要因素,Cr暴露对成人存在致癌风险,Cr和As暴露对儿童存在致癌风险.In order to ascertain the impact of pyrite mining on the surrounding farmland soil environment and human health, 42 surface soil samples(from 0-20 cm) were collected around the pyrite mining area in Longyou county. In this study, the concentrations of eight heavy metals(As, Cd, Cr, Cu, Hg, Ni, Pb, and Zn) and the pH in the topsoil were analyzed, and the concentration characteristics of heavy metals, source analysis, and human health risks assessment were studied using statistical analysis(SA), geo-accumulation index(I_(geo)), positive matrix factorization(PMF), and the health risk model. The average of ω(Cd), ω(Cu), ω(Pb), and ω(Zn) concentrations exceeded the background values of soils in Zhejiang province and China. According to the agricultural land pollution risk screening values(GB 15618-2018), Cd, Cu, Pb, and Zn were up to 82%, 49%, 42%, and 31%, respectively. The I_(geo)shows that the major pollutant element in the soils was Cd, followed by Cu, Pb, and Zn. The PMF analysis indicates that nature sources(As, Cr, and Ni), comprehensive pollution sources caused by high geological background and mining of ore-forming geological bodies(Cd, Cu, Pb, and Zn), and anthropogenic sources(Hg) were the three major sources of heavy metals in the study area, with contributions of 32%, 46%, and 22%, respectively. The results of the health risk assessment indicate that the major non-carcinogenic factor triggering risks was the ingestion of Pb;Cr exposure had carcinogenic risk for adults, and Cr and As exposure had carcinogenic risk for children.

关 键 词：硫铁矿区 农田土壤 重金属 正定矩阵因子分析(PMF) 健康风险评价 

分 类 号：X53[环境科学与工程—环境工程] X820.4