典型废弃锰矿厂渣库土壤重金属污染特征与评价

Characteristics and Evaluation of Heavy Metal Contamination in Soil of Typical Waste Dumping Area

为研究广西某废弃锰矿厂废渣堆存区土壤重金属污染状况及评价重金属对土壤环境质量的影响,以广西某废弃锰矿厂废渣堆存区土壤为研究对象,在堆存区内设置45个采样点以及周边区域的4个对照点。利用内梅罗综合污染指数法和潜在生态风险法结合GIS克里金插值法对堆存区土壤中Pb、Hg、Cr、As、Cu、Cd、Ni、Co 8种重金属的污染分布规律及来源进行分析。结果表明:堆存区土壤样品中8种重金属含量均高于广西土壤环境背景值,在垂直分布上的特征为随着土壤深度的增加重金属含量先升高后降低,而Cr因受到酸性土壤的影响含量随着土壤深度增加而增加。堆存区土壤样品中As处于轻度污染状态,Co处于重度污染状态,Hg、Cd具有很强、强的潜在生态风险。

In order to study the heavy metal pollution status of soil in the waste storage area of an abandoned manganese mine in Guangxi and to evaluate the influence of heavy metals on soil environmental quality,45 sampling points and 4 control points in the surrounding area were set up in the waste storage area of an abandoned manganese mine in Guangxi as the research object.The pollution distribution patterns and sources of eight heavy metals,Pb,Hg,Cr,As,Cu,Cd,Ni and Co,in the soil of the stockpile area were analyzed by using the Nemerow comprehensive pollution index method and the potential ecological risk hair method combined with the GIS kriging interpolation method.The results show that the content of eight heavy metals in the soil samples of the stockpile area is higher than the background value of the soil environment in Guangxi,and the vertical distribution is characterized by the content of heavy metals increasing and then decreasing with the increase of soil depth,while the content of Cr increases with the increase of soil depth due to the influence of acidic soil.As in the soil samples of the stockpile area is in a light pollution state,Co is in a heavy pollution state,Hg and Cd have a strong,strong potential ecological risk.