【摘要】 为了探究莠去津污染土壤中莠去津的解吸特性,通过批量平衡法,研究了莠去津在白浆土、黑土、盐碱土上的解吸特征及影响因子。结果表明:3种土壤类型中莠去津的解吸过程经历了快速解吸、慢速解吸、最终达到解吸平衡3个阶段,平衡时间为720min;采用准二级动力学方程拟合效果最好。Freundlich方程可以较好地描述莠去津在3种土壤中的解吸等温曲线(R~2>0.969)。ΔG<0,ΔH>0,ΔS>0说明其解吸为自发吸热且无序的过程。莠去津在盐碱土中的解吸率最高,其次为黑土,白浆土解吸率最低。土壤pH升高或添加生物炭均能够降低莠去津在土壤中的解吸。更多还原

【Abstract】 To investigate the desorption characteristics of atrazine in different soils contaminated by atrazine,the desorption behavior and its affecting factors were studied by batch balance method in albic soil,black soil,and saline soil.The results showed that the process of atrazine desorption in the three soils experienced three stages:rapid desorption,slow desorption and finally desorption equilibrium,and the equilibrium time was 12 h.Freundlich equation could better describe the desorption isotherm curve of atrazine in three soils(R2>0.969).ΔG<0,ΔH>0,ΔS>0.This indicated that desorption was a spontaneous and disordered process of heat absorption.Atrazine had the highest desorption rate in saline soil,followed by black soil and albic soil.Increasing the pH value of soil or adding biochar could reduce the desorption capacity of atrazine in soil.更多还原