【作者】 王亚平； 潘小菲； 岑况； 刘素芳； 韩志文；

【Author】 WANG Ya-ping~1,PAN Xiao-fei~2,CEN Kuang~3,LIU Su-fang~4,HAN Zhi-wen~5 (1.National Research Center of Geoanalysis,Beijing 100037,China;2.Institute of Geology and Geophysics Chinese Academy of Sciences,Beijing 100029,China;3.China University of Geosciences,Beijing 100083,China;4.Water Resource Bureau of Haidia,Beijing 100089,China; 5.Water Resource Bureau of Daxing,Beijing 102600,China)

【机构】 国家地质实验测试中心； 中国科学院地质与地球物理研究所； 中国地质大学(北京)； 北京市海淀区水资源局； 北京市大兴区水资源局；

【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。更多还原

【Abstract】 This paper introduces the recent research progress on adsorption and migration of important pollutants of cadmium and mercury.Isothermal-adsorption 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 adsorption-competing 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 laver is less than that of pure water because during the migration bivalent cadmium forms precipitants and blocks liquid migration.45 references are cited.更多还原