1,1,2,2-四氯乙烷在土壤中的吸附解吸研究及解吸滞后的新型模型模拟  

Sorption and Desorption of 1,1,2,2-Tetrachloroethane in Soils and New Model Prediction of Desorption Hysteresis

作　　者：王方[1] 张承东[1] 

机构地区：[1]南开大学环境科学与工程学院天津市城市生态环境修复与污染防治重点实验室环境污染过程与基准教育部重点实验室,天津300071

出　　处：《农业环境科学学报》2011年第2期295-300,共6页Journal of Agro-Environment Science

基　　金：高等学校博士学科点专项科研基金资助课题(20060055035);科技部国际科技合作项目(2009DFA91910)

摘　　要：采用室内实验方法,研究了1,1,2,2-四氯乙烷(1,1,2,2-tetrachloroethane,1,1,2,2-TeCA)在4种土壤上的吸附和解吸行为,并用一种新型解吸模型——"双元平衡解吸(Dual-EquilibriumDesorption,DED)模型"对其解吸行为进行了预测。结果表明,1,1,2,2-TeCA在4种土壤上的吸附符合传统的线性吸附模型,lgKoc的平均值为1.86;解吸行为则表现出明显的滞后现象,解吸后的lgKo(c平均值约为4.88)显著大于初始值,且与吸附相污染物的初始浓度、土壤性质无相关性。DED模型比传统线性模型能更好地拟合TeCA在土壤中的解吸滞后现象。In this study,the sorption and desorption of 1,1,2,2-tetrachloroethane（TeCA） in four soils were investigated.The desorption data was modeled using a new desorption model-＂Dual-Equilibrium Desorption（DED） model＂.The results indicated that the sorption of TeCA agreed well with the conventional linear sorption isotherm and the mean value of lg Koc was 1.86.However,the desorption exhibits significant hysteresis.The value of lg Koc after desorption（with mean value of 4.88） was significantly higher than that before desorption.The value was independent of the original concentrations of adsorbed TeCA in soils and of soil properties.In comparison with the traditional linear model,the desorption hysteresis of TeCA in soils could be predicted well with the DED model.

关 键 词：1 1 2 2-四氯乙烷 吸附 解吸 

分 类 号：X131.3[环境科学与工程—环境科学]