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.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
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)
关键词
1
1
2
2-四氯乙烷
吸附
解吸
1
1
2
2-tetrachloroethane
sorption
desorption
作者简介
作者简介：王方（1984-），女，博士研究生，主要研究方向为环境化学。E-mail：wangfang_0907@mail．nankai．edu．cn。
通讯作者：张承东E-mail：zhangchengdong@nankai．edu．cn
