挥发性有机污染物在土壤中的运移机制与模型  

THE MECHANISMS AND MODELS OF VOLATILE CONTAMINANTS TRANS PORTING IN SOILS

作　　者：彭胜[1] 陈家军[1] 王红旗[1] 

机构地区：[1]北京师范大学环境科学研究所环境模拟与污染控制国家重点联合实验室,北京100875

出　　处：《土壤学报》2001年第3期315-323,共9页Acta Pedologica Sinica

基　　金：高等学校博士学科点专项科研基金资助项目 (980 0 2 71 2 )

摘　　要：挥发性有机污染物在土壤多孔介质中有三种可能的存在状态 :溶于水中、挥发为气体及吸附于固体颗粒。挥发性有机污染物在水、气、固体颗粒三相间的物质交换与分配是决定其运移的重要因素 ,在相间物质交换为平衡的条件下 ,可用阻滞系数来表示其影响。污染物与土壤固体颗粒间的非平衡吸附解吸是相间交换中影响污染物运移的最重要的机制 ,由于天然土壤具有固有的不均质性 。Volatile contaminants exist in soils in three possible forms: dissolved in water , volatilized as vapor, and adsorbed by solid particles. The mass partitioning o r sorption between them is an important factor that affects contaminant transpor t, which could be represented by retardation coefficient in the case of that equ ilibrium partitioning or sorption is attained. The most important mechanism affe cting contaminant transport is nonequilibrium in sorption and desorption occurri ng in soil between solid particles and water phase, which should be described wi th a series of coefficients due to the innate particle-scale heterogeneity of so ils.

关 键 词：污染物运移 物质交换 非平衡吸附解吸 挥发性有机物 土壤污染 

分 类 号：X131.3[环境科学与工程—环境科学]