广西大新县铅锌矿区某屯耕地土壤重金属污染特征及评价

Characteristics and Assessment of Heavy Metal Pollution in the Arable Soil from the Village of Daxin Lead Zinc Mining Area

为探明广西大新铅锌矿区某屯耕地土壤重金属污染状况,采集了该屯21个土壤样品,采用ICP-AES法分析了其中Cd、Cu、Pb、Zn、Mn、Cr六种重金属的含量。采用单因子污染指数和综合污染指数法对研究区土壤进行了评价。为矿区环境保护、农业生产提供参考。结果表明,耕地土中Zn、Cu、和Cr超过桂西南土壤背景值,Pb、Zn、Mn、Cd超过《国家土壤环境质量标准》(GB156182-1995)二级标准限值,整体呈现出以Cd、Pb、Zn为主,Cu、Mn、Cr次之的严重复合污染特征。不同土地利用类型土壤内综合污染程度排序为菜地>弃耕地>玉米地,污染级别都达到重度污染。

To determine the level of heavy metals pollution in soils from a certain village of Daxin lead zinc mining area in Guangxi ,21 soil samples were collected from this village .ICP-AES was used to analyze heavy metals elements including Cd ,Cu ,Pb ,Zn ,Mn and Cr of these samples .The single factor pollution index and the comprehensive pollution index were used to evaluate the soils in the study area .The result may provide a reference for the environment protection and agricultural produc-tion in this mining area .Results show that Zn ,Cu and Cr concentrations in arable soil are higher than the background values of soil in southwest of Guangxi and Pb ,Zn ,Mn and Cd concentrations in arable soil are higher than that of the Second Grade for Environmental Quality Standard for Soils （ GB15618 , 1995） .As a whole ,it shows the serious combined pollution characteristics of Cd ,Pb ,Zn ,and Cu ,Mn , Cr follow .The order of the comprehensive pollution degree of soil of different land use types is vegeta-ble plots＆gt;abandoned lands＆gt;corn fields .The soil samples are all heavily contaminated .