摘要
测定了沱河芦岭矿塌陷区段沉积物重金属含量,运用地累积指数法和潜在生态风险指数法对其进行污染评价,通过分析8种重金属元素和极易迁移元素Sr的相关性强弱评价其迁移能力。结果表明:(1)沱河芦岭矿塌陷区沉积物中Mn、Ni、Zn、Cu、Cr和As平均浓度均超过背景值,8种重金属元素浓度的最大值均位于两个塌陷区之间的河流段Ⅱ;(2)地累积指数显示,河流段Ⅱ比其它3个分段重金属污染严重,为轻度或偏中度污染,且主要污染物为As、Ni、Zn和Cr;(3)潜在生态风险指数显示,沱河芦岭矿塌陷区沉积物8种重金属污染处于轻微的生态风险等级;(4)8种重金属元素与Sr相关系数显示,沱河芦岭矿塌陷区段沉积物8种重金属元素迁移能力排序为:Zn>Pb>As>Mn>Cu>V>Cr>Ni。
Contents of heavy metals in sediments from Luling Mine subsidence area section of Tuohe River were determined.The pollution of heavy metals was assessed using index of geoaccumulation and Lars Hanson method.Migration ability of 8 kinds of heavy metals as well as the extremely easy migration element Sr was evaluated by analyzing the correlation between them.Results indicated that average contents of Mn,Ni,Zn,Cu,Cr and As in sediments from Luling Mine subsidence area section of Tuohe River were more than background value,and maximum content points of 8 kinds of heavy metals were located in river segment Ⅱ between two subsidence areas.According to geoaccumulation index,heavy metal pollution of river segment Ⅱ,ranging mild from moderate migraine,exceeded other river segments and its main pollutants were As,Ni,Zn and Cr.Potential ecological risk index indicated that degree of 8 kinds of heavy metals pollution in the sediments from the river section represented mild ecological harm.Correlation coefficients between 8 kinds of heavy metals and Sr showed that the order of heavy metal migration ability in sediments of the section was as Zn,Pb,As,Mn,Cu,V,Cr and Ni from high to low.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2013年第7期13-17,22,共6页
Environmental Science & Technology
基金
国家自然科学基金面上项目(41173106)
宿州学院一般科研项目(2012yyb02)
关键词
塌陷区
重金属
沉积物
污染评价
迁移
subsidence area
heavy metal
sediment
pollution assessment
migration
