摘要
为了掌握冶炼厂场地土壤环境风险水平,为环境风险管理提供技术依据,以典型冶炼厂为研究对象,分别测定了土壤中As、Cu、Ni、Hg、Pb、Cd和Zn等指标浓度,利用反距离权重插值法研究重金属空间分布特征,运用单因子污染指数法、内梅罗综合指数法、地质累积指数法、潜在生态风险指数法和生态风险预警指数法评价了土壤重金属的污染程度和生态风险水平。结果表明:研究区内所有重金属指标浓度均存在超过GB 15618—2018中的风险筛选值的现象,且具有高度变异性。熔炼区、吹炼及贫化区和仓库区土壤重金属污染最严重。Cd、Pb、Hg、Zn、As和Cu指标的Pi和Pn均处于重度污染等级;Cd、Pb、Hg、Zn、As和Cu指标均存在累积风险。研究区内土壤重金属潜在生态风险指数的范围为10322~68663,均处于极强风险等级;生态风险预警指数为409~2467,均处于重警等级。
In order to master the level of environmental risk in the soil of the smelter site and pro-vide technical basis for environmental risk management,the concentrations of As,Cu,Ni,Hg,Pb,Cd and Zn in the soil were respectively determined with a typical smelter as the research ob-ject,and the spatial distribution characteristics of heavy metals were studied by using inverse dis-tance weight interpolation method.The pollution degree and ecological risk level of soil heavy metals were evaluated by single factor pollution index,Nemerow pollution index,geological accu-mulation index,Nemerow composite index,geological accumulation index,potential ecological risk index and ecological risk early warning index.The results showed that the concentrations of all heavy metals in the study area exceeded the risk screening value of GB 15618—2018,and showed high variability.The soil heavy metal pollution was the most serious in melting area,blo-wing and dilution area and warehouse area.The Pi and Pn of Cd,Pb,Hg,Zn,As and Cu inde-xes were all in the severe pollution level.Cd,Pb,Hg,Zn,As,and Cu indicators all had cumu-lative risks.The potential ecological risk index of soil heavy metals in the study area ranged from 10322 to 68663,all of which were at very high risk level.The ecological risk warning index ranged from 409 to 2467,all of which were in the heavy alarm level.
作者
梁增强
杨菁
Liang Zengqiang;Yang Jing(Tianjin Huanjian Environmental Testing Co.,LTD.,Tianjin 300191,China;Beijing Bosen Environmental Technology Co.,LTD.Tianjin Branch,Tianjin 300011,China)
出处
《河北环境工程学院学报》
CAS
2024年第1期77-82,94,共7页
Journal of Hebei University of Environmental Engineering
关键词
土壤污染
重金属
冶炼厂
污染特征
生态风险
soil pollution
heavy metal
smelter
pollution characteristics
ecological risk
