摘要
土壤胶体在多孔介质中的运移受多种环境因素的影响,其中胶体特性和介质条件是决定胶体运移过程的关键因素。选取土壤体系中不同结构类型的粘土矿物胶体高岭石和蒙脱石作为实验材料,通过胶体对铅的吸附实验,制得被铅污染的胶体,利用室内砂柱模拟实验,分别研究了水洗和烘烤处理得到的表面粗糙度不同的石英砂介质条件下,污染与未污染的四种特性胶体在多孔介质中的迁移规律。结果表明:铅的存在降低了高岭石胶体和蒙脱石胶体在饱和多孔介质中的流动性;介质表面粗糙度会显著影响蒙脱石胶体的运移过程,而对高岭石胶体基本无影响;胶体粒径大小是决定胶体运移过程是否受介质表面影响的主要因素。
Properties of porous media and colloids are primary factors controlling colloids transport in porous media.Two typical different structural clay minerals in soil,kaolinite and montmorillonite,were used as the experimental materials.The Pb contaminated colloids were prepared through adsorption of Pb on colloids.The transport of the contaminated and uncontaminated kaolinite and montmorillonite colloids was investigated in quartz sand column with different surface roughness.The columns were packed with washed and baked quartz sand re-spectively.Results showed that the adsorption of Pb decreased the mobility of kaolinite and montmorillonite.The surface roughness signifi-cantly decreased the mobility of montmorillonite but did not influence the transport of kaolinite.Colloids size was the principal factor deter-mining the effects of surface roughness on the transport of colloids through porous media.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2012年第12期2361-2366,共6页
Journal of Agro-Environment Science
基金
中央高校基本科研业务费专项(QN2011151
QN2011017)
西北农林科技大学博士科研启动基金(2011BSJJ112
2010BSJJ072)
关键词
多孔介质
表面粗糙度
铅
胶体
运移
porous media
surface roughness
Pb
colloids
transport
