金霉素在粉质黏壤土中的吸附与解吸行为研究  

Research on the Adsorption and Desorption Behavior of Chlorotetracycline in Silty Clay Loam

作　　者：丁于辉[1] 胡育筑[1] 陈建秋[1] 

机构地区：[1]中国药科大学分析化学教研室,江苏南京210009

出　　处：《安徽农业科学》2011年第15期8979-8982,共4页Journal of Anhui Agricultural Sciences

基　　金：国家环保公益性行业科研专项(200809016);江苏省环境工程重点实验室开放基金项目(KF2009008)

摘　　要：[目的]研究金霉素在粉质黏壤土中的吸附与解吸行为,评估其环境风险。[方法]采用批平衡试验研究初始浓度分别为10、20、30、40和50 mg/L金霉素在土壤中的吸附-解吸行为。[结果]吸附-解吸试验数据能够用Freundlich模型进行很好的拟合(R2=0.980),并观察到土壤吸附-解吸滞后现象发生,说明部分金霉素能紧密吸附在土壤颗粒上,在解吸过程中没有被解吸,滞后系数H为0.60。计算了有机质引起的自由能的改变,ΔGom=-20.00 kJ/mol,表明吸附是一个自发的过程,为物理吸附。金霉素在粉质黏壤土中的吸附系数为3 070 L/kg。[结论]金霉素流动性较低,吸附在土壤上的吸附能力较强。[Objective]The aim was to research the adsorption and desorption behavior of chlorotetracycline in silty clay loam and estimate its environmental risk.[Method]The batch balance test was used to research the adsorption-desorption behavior of chlorotetracycline in soil and its initial concn.were set at 10,20,30,40,and 50 mg/L resp.[Result]The data from adsorption-desorption experiment could be fitted very well with Freundlich model（R2=0.980）.And the adsorption-desorption hysteresis in soil was observed and its hysteresis coefficient（H） was 0.60,indicating that a part of chlorotetracycline could adsorb on soil particles closely and was not desorbed in desorption process.The change in free energy（ΔGom） due to organic matter was calculated as-20.00 kJ/mol,indicating that the adsorption was spontaneous physical adsorption.The adsorption coefficient of chlorotetracycline in silty clay loam was 3 070 L/kg.[Conclusion] The mobility of chlorotetracycline was low and it had higher adsorbability to soil.

关 键 词：金霉素 吸附 解吸 滞后系数 吸附自由能 

分 类 号：X592[环境科学与工程—环境工程]