摘要
通过对陕西北部矿区4种土地类型(草地、农田、道路、矿区)中8种重金属元素(Cd、Cu、Cr、Hg、Ni、Pb、As、Zn)含量的测定,结合毗邻区土壤重金属背景值,对矿区不同土地利用类型的土壤重金属污染程度和综合潜在生态风险危害进行评价。结果表明:1)研究区土壤Hg和Cd元素累积明显,其余6种重金属虽未超过GB15618—1995《土壤环境质量标准》二级标准,但已呈现出一定的累积效应;2)4种土地利用类型下Hg和Cd元素分担率高达93%以上,单项污染指数达到重度污染水平,其余6种重金属元素分担率相对较低,单项污染指数表现为清洁水平,综合污染指数计算表明,4种土地利用类型均表现为重污染;3)综合潜在生态风险指数计算表明,草地处于重度风险等级,其余3种土地类型均为严重风险等级。
Through the determination of contents of eight heavy metal elements (Cd, Cu, Cr, Hg, Ni, Pb, As, and Zn) under four land use types (Grassland, Farmland, Roads, and Mining areas) in northern Shaanxi mining area, the pollution degree and potential ecological risk of soil heavy metals are evaluated combing with the soil heavy metal background in adjacent areas.The results showed that: 1) The accumulation of Hg and Cd in the soil is significant in the study area.Although the remaining six heavy metals do not exceed the they have present some cumulative effects.2) Hg and Cd pollutant sharing rate is as high as 93%, and single pollution index reaches severe pollution level.However, the share of the other heavy metals are relatively low, and the single pollution index shows a clean level.The comprehensive pollution index showed that the four land use types all are on heavy pollution.3) The comprehensive potential ecological risk index indicated that the grassland is at a severe risk level, whereas farmland, roads, and mining areas are at serious risk level.
作者
赵晓光
张亦扬
杜华栋
ZHAO Xiao-guang;ZHANG Yi-yang;DU Hua-dong(College of Geology & Environment,Xi’an University of Science and Technology,Xi’an 710054,China)
出处
《环境工程》
CAS
CSCD
北大核心
2019年第9期188-193,共6页
Environmental Engineering
基金
中国博士后科学基金(2018M643689)
陕西省自然科学基础研究计划面上项目(2019JM-460)
关键词
陕西北部
矿区
煤炭开采
污染土壤
重金属
生态风险评价
Northern Shaanxi
mining area
coal mining
contaminated soil
heavy metal
ecological risk assessment
