摘要
通过对秀山土家族苗族自治县8个锰矿影响区的土壤重金属(Mn、Hg、As、Cd、Cu、Pb、Zn、Cr、Ni)含量进行测定分析,以长江流域各重金属元素背景值、土壤环境质量农用地土壤污染风险筛选值为评价标准,应用单因子污染指数法、Nemero综合污染指数法和Hakanson潜在生态危害指数法对土壤重金属潜在生态风险进行了评价。结果表明:对比长江流域各重金属元素背景值,研究区部分点位超标,Cd和Zn点位超标率高达100%,超标倍数最高达9.36倍;对比农用地土壤环境质量标准,研究区Cd、Cr、Cu、Ni和Zn存在超标现象,且Cd点位超标率高达66.67%;单因子污染指数法及Nemero综合污染指数法评价结果均显示研究区存在Cd轻微污染,考虑到秀山处于Cd高背景值区,Cd轻微污染的原因还需进一步研究;潜在生态风险评价结果显示,黄家河脚锰矿和嘉源锰矿影响区存在中等生态危害,应予以重视。
In the determination and analysis of heavy metal content(Mn,Hg,As,Cd,Cu,Pb,Zn,Cr,Ni)of soil in 8 manganese mine-affected areas in Xiushan County,we have found that the background value of each heavy metal element in Changjiang River Basin and soil environmental quality are used for agricultural purposes.The soil pollution risk screening value is the evaluation standard and the single factor pollution index method.Nemero comprehensive pollution index method and Hakanson potential ecological hazard index method are used to evaluate the potential ecological risks of soil heavy metals.The results show that,in comparing the background values of various heavy metal elements in the Yangtze River Basin,some points in the study area exceed the standard.The over-standard rate of Cd and Zn points is as high as 100%and the over-standard multiple is up to 9.36 times.Compared with the soil environmental quality standards for agricultural land,we think the study area Cd,Cr,Cu,Ni and Zn have exceeded the standard.The Cd point exceeded the standard rate as high as 66.67%.The single factor pollution index method and Nemeiro comprehensive pollution index method evaluation results show that there is slight Cd pollution in the study area.Considering that Xiushan is located in the high Cd background value area,the reason for the slight Cd pollution needs further study.Potential ecological risk in evaluation results shows that there are moderate ecological hazards in the affected areas of Huangjiahejiao Manganese Mine and Jiayuan Manganese Mine,which should be paid more attention to.
作者
李惠敏
周川
梁睿雨
LI Huiming;ZHOU Chuan;LIANG Ruiyu(Chongqing Institute of Geology and Mineral Resources, Chongqing 401120, China;Chongqing Key Laboratory of Exogenic Mineralization and Mine Environment, Chongqing 401120, China;Chongqing Mine Soil Environment Monitoring and Remediation Engineering Technology Research Center, Chongqing 401120, China)
出处
《中国锰业》
2022年第2期11-14,共4页
China Manganese Industry
关键词
锰矿
土壤重金属
生态风险
评价
Manganese mine
Heavy metals in soil
Ecological risk
Evaluate
