摘要
介绍了国内外近年来对重要的污染元素汞和镉在土壤中吸附和运移方面的研究成果。评价土壤吸附重金属离子多运用Langmuir、Freundlich及Temkin三种等温吸附曲线。影响土壤吸附汞和镉的因素主要有pH值、有机质、氯离子、土壤组分、土壤类型、竞争吸附离子的参与等。汞的活动性较差,其迁移性质缺乏研究;土壤中镉的二价离子在粘土衬层内的迁移过程中,可生成难溶性沉淀物质,阻碍了液体的渗透,因而导致渗透系数比纯水还低。引用参考文献45篇。
This paper introduces the recent research progress on adsorption and migration of important pollutants of cadmium and mercury. Isothermaladsorption curves based on Langmuir equation, Freundlich equation and Temkin equation are used to estimate adsorbing capacity of the soils for heavy metal ions. It is found that main factors that affect cadmium and mercury adsorbing by soils are pH, organic materials, chloride ions, soil composition and types, other adsorptioncompeting ions. Few research results on mercury migration are obtained because of its inactive characteristic. It is also found that the penetrating coefficient of bivalent cadmium in clay layer is less than that of pure water because during the migration bivalent cadmium forms precipitants and blocks liquid migration. 45 references are cited.
出处
《岩矿测试》
CAS
CSCD
北大核心
2003年第4期277-283,共7页
Rock and Mineral Analysis
基金
中央级科研院所社会公益研究项目(2001DIA10021)
国家重点基础研究发展规划项目(TG1999045700)
关键词
汞
镉
土壤
吸附
运移
等温吸附曲线
mercury
cadmium
isothermal-adsorption curve
competing adsorption
migration
soils
