可溶性有机质对土壤胶体可移动性影响试验研究  

Experimental study on effect of dissolved organic matter on mobility of soil colloids

作　　者：张文杰[1] 蒋峰永 ZHANG Wen-jie;JIANG Feng-yong(School of Mechanics and Engineering Science,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学力学与工程科学学院,上海200444

出　　处：《岩土工程学报》2021年第11期2013-2019,I0009,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(41772300)。

摘　　要：土壤胶体广泛存在于地下环境中,胶体可能加快也可能阻滞土中污染物迁移,关键在于胶体的可移动性。以腐殖酸和牛血清白蛋白为典型可溶性有机质,以膨润土胶体作为典型无机土壤胶体,进行一系列胶体迁移试验,研究了不同离子强度条件下不同可溶性有机质对土壤胶体可移动性的影响,根据DLVO理论探讨土壤胶体迁移机理。试验结果表明,膨润土胶体的可移动性随着离子强度的增大而减弱;腐殖酸和牛血清白蛋白均有利于膨润土胶体的移动,其中腐殖酸比牛血清白蛋白更能加快胶体移动;离子强度相同时,大孔隙度介质中膨润土胶体的可移动性高于小孔隙度介质。Soil colloids are widely distributed in underground environment.They can facilitate or retard the migration of pollutants in soils,depending on the mobility of the colloids.By choosing the humic acid and bovine serum albumin as the typical dissolved organic matters and the bentonite colloid as the typical soil inorganic colloid,a series of colloid migration tests are carried out to investigate the effect of different dissolved organic matters on the mobility of the soil colloids under different ionic strengths.The mobility mechanism of the colloids is explored according to the DLVO theory.The results show that the mobility of the bentonite colloids decreases with the increasing ionic strength.Both the humic acid and the bovine serum albumin can facilitate the mobility of the bentonite colloid,among which the enhancement by the humic acid is more obvious than that of the bovine serum albumin.Under the same ionic strength,the mobility of the bentonite colloid in column with larger pore volume is higher than that with smaller pore volume.

关 键 词：可溶性有机质 土壤胶体 可移动性 离子强度 

分 类 号：TU411[建筑科学—岩土工程]