摘要
对广西3个锰矿区的废弃地土壤重金属含量进行了分析,并对其进行了污染评价。结果表明,3个锰矿恢复区土壤的Cu、Pb、Cd、Zn、Mn和Cr 6种重金属元素全量均超过相应广西土壤背景值,其中Cd含量均超过国家土壤环境质量二级标准。3个矿区土壤中的Mn和Zn无显著差异,Mn含量均大大超过170~1 200 mg/kg适中标准的上限值。从单因子污染指数来看,Pb、Zn、Cu未对3个矿区造成污染,Cr为轻微污染,Cd为重污染;综合污染指数显示3个矿区总污染等级达到了重污染。可见,Mn和Cd是这3个矿区的主要污染元素。
Extensive soil sampling was conducted from wastelands of three different manganese mines in Guangxi. Heavy metal concentrations were determined and pollution index（Pi） was used to assess the heavy metal contamination.The results showed that the concentrations of Cu、Pb、Cd、Zn、Mn and Cr in three manganese mines were all much higher than the background level of Guangxi,moreover, the concentrations of Cd were even beyond the Class II, according to China environmental quality standard for soils. No significant difference was found in the concentrations of Mn and Zn among the soils from the three mines and the Mn levels all surpassed the upper limit of the moderate range（170~1 200 mg / kg）, which suggested that the mine soils might be polluted by Mn. The values of Piindicated that the mine soils were not polluted by Pb,Zn and Cu,but slightly polluted by Cr and seriously polluted by Cd. The Nemero indices showed that the total pollution of the three manganese mines reached to heavy pollution level. In conclusion, the three manganese mine wastelands were seriously polluted by Mn and Cd.
出处
《湖北农业科学》
2016年第3期575-580,共6页
Hubei Agricultural Sciences
基金
国家自然科学基金项目(41301343)
桂林市科学研究与技术开发计划项目(20130117-3)
关键词
锰矿区
重金属污染
广西
manganese mine
heavy metal contamination
Guangxi
