摘要
以山东某矿区为例,通过淋溶模拟实验,研究了煤矸石中重金属的淋溶规律,并探讨了煤矸石山周边土壤重金属污染特征。结果表明:风化矸石淋滤液中的Zn、Pb、Cr和Cu浓度较高,并很快稳定;新鲜矸石在淋溶初期检出Zn,其它重金属元素没有检出;风化矸石淋滤液中重金属的含量要高于未风化矸石。矸石山周边表层土壤中的Zn、pb、Cr和Cu较高,且浓度高出矸石淋溶液许多倍,表明煤矸石中重金属淋滤具有长期性,矿区土壤对重金属具有迁移性和富集性。表层土壤重金属含量随着距煤矸石堆的距离增加而呈明显的下降趋势,充分表明矸石山对周边土壤造成了严重的重金属污染,而且在土壤剖面上,重金属含量表现出随土壤深度的增加而降低的趋势。
Based on leaching experiment,the leaching rule of heavy metal in coal mine waste was brought out.The research showed that: Zn,Cr,Pb and Cu concentrations were most in the leachate of weathered coal waste,and the concentration became stable rapidly;only Zn concentrations are found in fresh coal waste leachate in the beginning time.The soil around coal mine waste also was contaminated by heavy metal,such as Zn,Cr and Pb.The process that heavy metal is leached out is a long time,and heavy metal could be migrated and accumulated.Some heavy metal gradually decreased with the soil depth increasing in the soil section.
出处
《水土保持学报》
CSCD
北大核心
2007年第4期189-192,共4页
Journal of Soil and Water Conservation
基金
济南大学科技基金项目(Y0620)
国家"863"计划项目(2003AA322040)
山东省社科规划重点项目(03BJJ37)资助
关键词
煤矸石
土壤重金属
淋溶
coal mine waste pile
soil heavy metals
leaching
