摘要
农田土壤重金属污染与粮食安全、人体健康安全息息相关。以贵溪市乌石坑铁矿为例,在废弃矿坑、尾矿库以及下游农田采集了52份表层土壤样本,检测其重金属含量,并对采样数据运用地累积指数法、潜在生态风险评价法评估重金属的污染特征,采用绝对主成分-多元线性回归模型(APCS-MLR)和正定矩阵因子分解模型(PMF)解析土壤重金属来源。结果表明:下游农田土壤Cu、Cd、As超过GB 15618—2018《土壤环境质量农用地土壤污染风险管控标准(试行)》筛选值;地累积指数评价结果表明:Cd处于偏中度污染级别,Cu、Ni、Zn处于轻度污染级别,As、Hg、Pb处于无污染级别。潜在生态风险评价结果表明:Cd(133.36)为较强生态风险,Hg(54.18)为中度生态风险,其他元素单项潜在生态风险均为轻度生态风险。研究区综合生态风险指数均值为226.59,整体呈较强的潜在生态风险。APCS-MLR与PMF模型评价得出结论相似,Pb主要是自然来源,Cd、Cu主要受废弃铁矿影响,Zn、Ni受自然和废弃铁矿共同影响,As主要来源于养殖场,Hg主要受化石燃料燃烧影响。
Heavymetal contamination in farmland is closely related to food safety and human health.This study investigated the heavy metal pollution in farmland soil near the Wushikeng Iron Mine in Guixi,Jiangxi Province.We collected 52 soil samples from the abandoned mining pits,tailings ponds,and downstream farmlands.We used the geo-accumulation index method and the potential ecological risk assessment method to evaluate the pollution characteristics of heavy metals in the soil.Additionally,the absolute principal component-multiple linear regression model(APCS-MLR)and positive matrix factorization model(PMF)were used to determine the sources of heavy metals detected in the soil.The study results showed that the contents of Cu,Cd,and As in the downstream farmland soil exceeded the screening value of the Soil Environmental Quality-Agricultural Land Soil Pollution Risk Control Standard(Trial)of China.The geo-accumulation index evaluation revealed that Cd was in moderately pollution level,Cu,Ni,and Zn were in slightly pollution level,and As,Hg,and Pb were in pollution-free level.Moreover,the potential ecological risk assessment results indicated that Cd(133.36)posed a strong ecological risk,Hg(54.18)posed a moderate ecological risk,and the other heavy metal elements posed a mild ecological risk.The average comprehensive ecological risk index of the study area was 226.59,indicating a strong potential ecological risk.Both the APCS-MLR and PMF models identified the sources of heavy metals in the soil.The results showed that Pb is mainly from natural sources,Cd and Cu are mainly affected by abandoned iron ore,Zn and Ni are affected by both natural and abandoned iron ore,As is mainly from farms,and Hg is mainly affected by fossil fuel combustion.
作者
宋炉生
孙振洲
胡晶
邓清海
SONG Lusheng;SUN Zhenzhou;HU Jing;DENG Qinghai(Geological Environment Monitoring Institute of Jiangxi Geological Survey and Exploration Institute,Nanchang 330006,China;College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China)
出处
《环境工程》
CAS
CSCD
2024年第10期155-164,共10页
Environmental Engineering
基金
江西省地质调查勘查院科研资金项目(赣地调字[2023]11号)
鹰潭市生态环境局项目(HS-YTZC-2021-006)。
作者简介
第一作者:宋炉生(1988-),男,工程师,主要研究方向为水工环地质调查与地质环境监测。15083806501@163.com;通信作者:邓清海(1976-),男,副教授,主要研究方向为水工环地质。dqh2004@163.com。
