北汝河饮水源地土壤重金属元素污染特征分析

Analysis on Soil Pollution Characteristics of Heavy Metal Elements in the Drinking Water Source of Beiru River

为探讨北汝河襄城段饮水源地土壤重金属含量特征,采用单因子评价法、内梅罗综合污染指数法对饮水源地附近土壤中的重金属含量特征进行综合评价.结果表明:水源地污染主要受到Pb、Zn、Cu三种元素影响,Pb、Zn、As、Cu、Ni、Cr元素分别是环境背景值的1.34、1.03、0.87、1.36、0.70、0.97倍.研究区由Pb单因子污染指数最高是2.35,最低是0.71,处于轻度污染范围和清洁无污染范围.7个研究区中内梅罗综合污染指数最低为0.63,最大为3.06,2%土壤样品污染等级为安全,14%处于警戒线,60%属于轻度污染,6%属于中度污染,2%属于重度污染.7个研究区中Pb、Zn、As、Cu、Ni、Cr六种元素都有不同程度的超标,其中北汝河北岸土壤重金属Pb元素超标程度最高.

In order to explore the characteristics of heavy metal content in the soil of drinking water sources in the Xiangcheng section of the Beiru River,the single factor evaluation method and the Nemero comprehensive pollution index method were used to comprehensively evaluate the characteristics of heavy metal content in the soil near the drinking water source.The results show that the pollution of water sources is mainly affected by Pb,Zn and Cu,and the elements of Pb,Zn,As,Cu,Ni and Cr are 1.34,1.03,0.87,1.36,0.70 and 0.97 times of the environmental background values,respectively.The highest Pb single-factor pollution index in the study area was 2.35 and the lowest was 0.71,which were in the range of light pollution and clean pollution.The lowest comprehensive pollution index of Nemero in the seven study areas was 0.63 and the maximum was 3.06.And 2%of the soil samples were classified as safe,14%were in the warning line,60%were light pollution,6%were moderate pollution,and 2%were severely polluted.In the 7 study areas,Pb,Zn,As,Cu,Ni and Cr elements all exceeded the standard to varying degrees,and the soil of the north bank of the BeiRu River had the highest level of Pb element exceeding the standard.