介质粗糙度和铅污染对粘土矿物胶体运移的影响  

Effect of Surface Roughness and Pb Pollution on the Transport of Mineral Colloids in Saturated Porous Media

作　　者：孙慧敏[1,2] 殷宪强[1,2] 王益权[1,2] 

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100 [2]农业部西北植物营养与农业环境重点实验室,陕西杨凌712100

出　　处：《农业环境科学学报》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)

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.

关 键 词：多孔介质 表面粗糙度 铅 胶体 运移 

分 类 号：X131.3[环境科学与工程—环境科学]