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.
出处
《环境污染与防治》
CAS
CSCD
北大核心
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
关键词
土壤
磺胺间甲氧嘧啶
吸附
解吸
soil
sulfamonomethoxine （SMM）
adsorption
desorption
