磺胺间甲氧嘧啶在土壤中的吸附/解吸特性研究  

Research on the adsorption/desorption characteristics of sulfamonomethoxine on the soil

作　　者：金彩霞[1] 陈秋颖[1] 刘军军[1] 周庆祥[1] 

机构地区：[1]河南师范大学化学与环境科学学院,河南省环境污染控制重点实验室,黄淮水环境与污染防治省部共建教育部重点实验室,河南新乡453007

出　　处：《环境污染与防治》2010年第5期47-51,共5页Environmental Pollution & Control

基　　金：河南省基础与前沿技术研究计划项目(No.092300410090);黄淮水环境与污染防治省部共建教育部重点实验室资助项目

摘　　要：通过吸附/解吸动力学、吸附/解吸热力学试验研究了磺胺间甲氧嘧啶(SMM)在河南土壤上的吸附/解吸行为,并分析了影响SMM吸附/解吸的因素。结果表明,SMM在土壤中的吸附系数为18.9mL/g,土壤有机碳吸附系数为466.2mL/g,SMM在土壤中具有一定的移动性,对地下水和地表水存在一定的污染风险;描述SMM吸附过程的最优动力学方程为一级反应动力学方程,土壤对SMM的吸附近似于一级反应,且SMM在土壤中的吸附以物理吸附为主;用Freundlich方程来描述SMM在土壤的等温吸附行为最适宜,且SMM在土壤中的吸附经验常数的倒数均小于1,属于L-型吸附等温线。The adsorption/desorption kinetics and thermodynamics of sulfamonomethoxine （SMM） by soil were investigated to study the SMM adsorption/desorption behavior and its influence factors. The results showed that adsorption coefficient of SMM （Kd） was 18. 9 mL/g which correlated the organic carbon adsorption constant （Koc） of 466.2 mL/g, it meant that SMM had strong mobility and posed a risk to surface and ground water. The data of SMM adsorption by soil were well described by first-order dynamic equation, and the adsorption was primarily due to physical association. The Freundlich isotherm model fitted the experimental data better than other isotherm models with the adsorption empirical constant smaller than 1. The adsorption of SMM by soil belonged to L-style adsorption isotherm.

关 键 词：土壤 磺胺间甲氧嘧啶 吸附 解吸 

分 类 号：X53[环境科学与工程—环境工程]