阿特拉津在天然水体沉积物中的吸附行为

本文研究了阿特拉津在几种水体沉积物中的吸附、解吸规律，并进一步探讨了沉积物浓度、pH值和离子强度对其吸附行为的影响．结果表明，不同沉积物对阿特拉津的吸附程度由沉积物本身的总有机碳、粘土矿物、阳离子交换容量、比表面积以及铁锰氧化物等理化特性综合作用的结果，有机碳不是影响阿特拉津吸附的唯一重要因素．连续吸附实验结果指出，化合物的起始浓度愈大，吸附时间愈长，阿特拉津的最大吸附容量也愈大，且在解吸过程中表现出一定的滞后性(即不可逆吸附)．沉积物浓度与其吸附量呈负相关；溶液的pH值增大，沉积物对阿特拉津吸附能力减弱；离子强度愈大，沉积物对阿特拉津吸附能力愈强．

STUDY ON THE SORPTION BEHAVIOR OF ATRAZINE BY NATURAL AQUATIC SEDIMENTS

In this paper,adsorption and desorption of atrazine by four sediments were studied.Effects of solid concentration,pH value and ionic strength on the sorption of atrazine were also carried out using batch equilibrium experiments.The results show that the sorption of atrazine by sediments depends on the physical and chemical characteristics of sediments.The greater initial concentration of atrazine and the longer adsorption time,the larger adsorption capacity for atrazine.Furthermore,hysteresis phenomenon was observed during desorption processes.There exists negative relation between solid concentration and the amount of atrazine adsorption,as well as between pH and atrazine adsorption.However,the adsorption of atrazine by the sediment increases with ionic strength.