四环素在黄土中的吸附行为  

Adsorption of tetracycline on loess soils

作　　者：武庭瑄[1,2] 周敏[1] 郭宏栋[1] 段辉[3] 陈慧[1] 

机构地区：[1]西北师范大学化学化工学院,兰州730070 [2]太原工业学院环境工程系,太原030008 [3]甘肃省分析测试中心,兰州730000

出　　处：《环境科学学报》2008年第11期2311-2314,共4页Acta Scientiae Circumstantiae

基　　金：甘肃省教育厅科研基金项目(No.0501-07)~~

摘　　要：采用批吸附实验方法讨论了不同pH和离子强度条件下四环素在黄土中的吸附行为.实验结果显示,黄土对四环素有较强的吸附能力,添加可溶性腐殖酸可减少土壤对四环素的吸附量,吸附行为可以用Freundlich等温方程描述.随着土壤溶液中离子强度的增加,四环素在黄土表面的吸附逐渐减少,表明四环素在黄土表面的吸附是以阳离子交换作用为主.在pH=4.0～9.0的范围内,黄土对四环素的吸附系数随着pH的增大而减小.The sorption interactions of tetracycline antibiotics on loess soil surfaces under different pH and ionic strength conditions were investigated using batch sorption experiments.The results showed that tetracycline was adsorbed more strongly on loess surfaces than on loess-HA and the adsorption could be described by Freundlich isotherms.Adsorption of tetracycline on loess surfaces gradually decreased with the increase of natural cation concentrations in the solution,suggesting that cation exchange dominated the sorption processes.In addition,the sorption coefficients of tetracycline decreased as the pH increased from 4.0 to 9.0.

关 键 词：四环素 黄土 吸附 PH 阳离子 

分 类 号：X131[环境科学与工程—环境科学]