冷水江锑矿区重金属污染林地土壤环境质量评价

为了给锑矿区土壤生态修复、造林树种选择和快速恢复植被提供科学依据,采集了冷水江锑矿区受重金属污染的林地土壤样品,运用原子吸收分光光度法对土壤中6种重金属元素进行了测定,并对锑矿区受重金属污染的森林土壤环境质量进行了全面评价,结果表明:锑矿区三地点土壤中Sb、As、Pb、Hg、Cd、Zn含量有极显著差异。七里铺点土壤中以Sb、Hg、Cd、Zn含量最高,长龙界点土壤中以As含量最高,联盟点土壤中以Pb含量最高。随着土层厚度的增加,土壤中Sb、As、Pb、Hg、Cd、Zn含量呈递减的趋势。联盟点、长龙界点重金属污染的大小顺序是:Sb>Cd>Hg>As>Zn>Pb。七里铺点重金属污染的大小顺序是:Sb>Cd>Hg>Zn>As>Pb。依据内梅罗污染指数评价标准,冷水江锑矿区存在着严重的Sb、As、Cd、Hg和轻度的Zn、Pb复合污染。从不同土层重金属污染的内梅罗污染指数及重金属含量的分布特征分析,Sb、Hg在土壤中具有较大的迁移性,Zn具有中等的迁移性,而As、Pb、Cd则具有较小的迁移性。

Appraisal for Environmental Quality of Forestry Soil Polluted by Heavy Metals in Antimony Mine of Len-Shuijiang City

The environmental quality of forestry soil polluted by heavy metals in antimony is appraised by measurement six heavy metals element in soil with atomic absorption spectrophotometry in order to afford scientific principle to ecological rehabilitate soil and select forestation trees and restore vegetation rapidly in antimony mine.The soil samples polluted by heavy metals are collected in antimony mine of Leng-Shuijiang City.The result showed that the content of Sb,As,Pb,Hg,Cd,Zn in three sites soil there are significant difference.The content of Sb,Hg,Cd,Zn in soil excess As,Pb at Qilipu plot.The content of as is maximum at Changlongjie plot and The content of Pb is maximum at Lianmeng plot.The content of Sb,As,Pb,Hg,Cd,Zn reduce with soil depth increasing.The rank of heavy metal pollution is Sb>Cd>Hg>As>Zn>Pb at Lianmeng and Changlongjie plot but Qilipu plot is Sb>Cd>Hg>Zn>As>Pb.There is serious pollution by Sb,As,Cd,Hg and low-grade pollution by Zn,Pb according appraisal standard of nemero index in antimony mine of Leng-Shuijiang city.The Sb,Hg of soil transfer easier and Zn of soil transfer medium and As,Pb,Cd of soil transfer lesser according nemero index and the content of heavy metal distributing character by soil depth.