摘要
本文主要研究了棕壤和黑土<2μm胶体经磁处理后,铅离子吸附特性的变化以及腐殖质、游离氧化铁和磁场强度等对铅离子吸附的磁效应的影响。研究发现,磁处理(0.1～0.5T)可明显增加土壤胶体对铅离子的吸附量。其最大吸附容量 M 和吸附时结合能常数 K 也因磁化显著提高。还发现,去腐殖质和去游离氧化铁均引起土壤胶体最大吸附容量下降,但却都促进铅离子的磁增效应,即去腐殖质胶体和去铁胶体的铅离子吸附磁增效应均大于相应原胶体的。不同磁场场强以0.5T 处理的,土壤胶体铅离子最大吸附容量 M 增加最多。
The research conducted in this paper is mainly on the changes of lead adsorption on the surfaces of soil colloids,and on the influences of humic acid,free oxide iron,magnetic field in- tensity on magnetic effects of lead adsorption.As the results show,magnetic treatment can significantly intensify the adsorption of lead ion(Pb^(2+)).Also,the maximum adsorption ca- pacity and the combining coefficient(K)show a rising trend after colloids are treated in mag- netic field.Thirdly,although the processes of removing humus and removing free oxide iron lead to the decrease of the maximum adsorption capacity of lead,the magnetic effect of rising adsorption of lead can be achieved throuth these processes.In other word,the lead adsorption increased by magnetic treatment is more on the surfaces of colloids removed humus and col- loids removed free oxide iron than on the surfaces of original colloids.As far as magnetic field intensity is concerned,the maximum adsorption capacity of lead is increased most in the magnetic field with the intensity of 0.5T.
关键词
铅离子
土壤胶体
磁处理
lead adsorption
soil colloid
magnetic treatment
