摘要
为研究内蒙古自治区乌拉特后旗某铅冶炼厂场地土壤中重金属污染程度、风险及来源,采用反距离加权插值、地累积指数法(I_(geo))、内梅罗综合污染指数法(NPI)和潜在生态风险指数法(RI)进行风险评估,通过多种分析模型对重金属来源进行解析。结果表明,厂区土壤重金属含量较高,呈明显的块状分布,不同深度土壤中除Sb和Hg外,As、Pb、Cd、Cu和Zn平均值均超出内蒙古地区土壤元素背景值,除Cd外,表层土壤重金属含量普遍高于深层土壤中重金属含量;重金属高浓度分布区域主要在厂区中部的焙烧车间和南部的铅精矿存储区;I_(geo)表现为:Cd>Pb>Zn>Cu>As>Sb>Hg,存在一定程度的地质积累;NPI平均值为0.12,表明场地土壤总体安全;RI平均值顺序为:Cd>Sb>Hg>Pb>As>Cu>Zn,总体以低度风险为主,中度及重度风险区零星分布在厂区中部;源解析结果得到主要污染源,分别是工业源(矿石冶炼、粉尘颗粒和大气沉降)、交通运输源、化石燃料燃烧源和自然源。
In order to study the degree,risk and sources of heavy metal contamination in the soil of a lead smelting plant site in Urad Rear Banner,Inner Mongolia Autonomous Region,inverse distance-weighted interpolation,geological allumulation index(I_(geo)),Nemerow comprehensive pollution index(NPI),and potential ecological risk index methods(RI)were used for risk assessment,and the sources of heavy metals were analyzed by multiple source analysis models.The results show that the content of heavy metals in the soil of the study area is high,with a significant block distribution.The average values of As,Pb,Cd,Cu,and Zn in the soil at different depths all exceed the soil element background values in Inner Mongolia Autonomous Region,except for Sb and Hg.Except for Cd,the content of heavy metals in surface soil is higher than in other layers;the high concentration distribution areas of heavy metals are mainly in the roasting workshop in the middle of the factory area and the lead concentrate storage area in the south.The I_(geo) results show that Cd>Pb>Zn>Cu>As>Sb>Hg,indicating a certain degree of geological accumulation.The average NPI value is 0.12,indicating the overall safety of the site soil;the average RI value is in the order of Cd>Sb>Hg>Pb>As>Cu>Zn,which is mainly low-risk,with sporadic distribution of moderate and high-risk areas in the central part of the factory area.Source analysis results identified the main pollution sources,which are industrial sources(ore smelting,dust particles,and atmospheric deposition),transportation sources,fossil fuel combustion sources,and natural sources.
作者
孙祺
刘芳
孙浩然
李浩然
SUN Qi;LIU Fang;SUN Haoran;LI Haoran(School of Resources and Environmental Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Key Laboratory of Environmental Pollution Control and Remediation of the Universities of Inner Mongolia Autonomous Region,Inner Mongolia University of Technology,Hohhot 010051,China)
出处
《内蒙古工业大学学报(自然科学版)》
2025年第4期289-299,共11页
Journal of Inner Mongolia University of Technology:Natural Science Edition
基金
内蒙古自治区自然科学基金项目(2020LH03002,2024LHMS03028)
内蒙古工业大学专创融合课程建设项目(ZC2023041)。
关键词
乌拉特后旗
冶炼企业
重金属
风险评价
源解析
Urad Rear Banner
smelting enterprises
heavy metals
risk assessment
source analysis
