磺胺甲基嘧啶在不同土壤介质中的迁移行为研究  

Transport of sulfamerazine in saturated soil porous media with different physicochemical

作　　者：刘梦雅 陈芷微 李艳香[2] 祁志冲 LIU Mengya;CHEN Zhiwei;LI Yanxiang;QI Zhichong(College of Chemistry and Molecular Sciences,Henan University,Kaifeng 475004,Henan,China;The Testing Center of Shandong Bureau,China Metallurgical Geology Bureau,Jinan 250014,Shandong,China)

机构地区：[1]河南大学化学与分子科学学院,河南开封475004 [2]中国冶金地质总局山东局测试中心,山东济南250014

出　　处：《化学研究》2025年第2期161-167,共7页Chemical Research

基　　金：河南省高等学校重点科研项目(23A610001)。

摘　　要：探究磺胺类抗生素在土壤中的迁移有助于更好地了解这些污染物的环境归趋。选取磺胺甲基嘧啶(Sulfamerazine,SMZ)作为一种典型的磺胺类抗生素,探究其在饱和土壤中的迁移特性。结果表明,SMZ的迁移主要与土壤的物理化学作用有关。总体而言,SMZ的沉积与CEC值和土壤有机质含量呈正相关,这主要归因于SMZ分子与土壤有机质之间的π-π作用、氢键、配体交换和疏水相互作用。较高的粘土矿物含量和较低的砂粒含量有利于抑制SMZ在土壤中的运移。与Na^(+)不同,Cu^(2+)离子可以作为土壤颗粒和SMZ分子之间的桥连因子,导致SMZ在土壤中呈现较弱的迁移特征。此外,溶液pH的变化(5.0~9.0)没有影响SMZ在不同土壤柱中的迁移趋势。同时,对于特定土壤,随着溶液pH的增加,SMZ的迁移能力逐渐增强,这是由于SMZ与土壤颗粒之间的静电斥力增强以及其与土壤有机质之间的疏水相互作用减弱所致。这项工作为磺胺类抗生素在土壤-水系统中的运移行为提供了有用的信息。Identification of the transport of sulfonamide antibiotics in soils facilitates a better understanding of the environmental fate and behaviors of these ubiquitous contaminants.In this study,the mobility properties of sulfamerazine(SMZ,a typical sulfonamide antibiotic)through saturated soils with different physicochemical characteristics were investigated.The results showed that the physicochemical characteristics controlled SMZ mobility.Generally,the mobility of SMZ was positively correlated with CEC values and soil organic matter content,which was mainly related to the interactions between the organic matter in soils and SMZ molecules via π-π stacking,H-bonding,ligand exchange,and hydrophobic interaction.Furthermore,higher clay mineral content and lower sand content were beneficial for restraining SMZ transport in the soils.Unlike Na^(+),Cu^(2+)ions could act as bridging agents between the soil grains and SMZ molecules,contributing to the relatively weak transport of SMZ.Furthermore,the trend of SMZ mobility in different soil columns was unaffected by solution pH(5.0-9.0).Meanwhile,for a given soil,the SMZ mobility was promoted as the solution pH values increased,which was caused by the enhanced electrostatic repulsion between SMZ-species and soil particles as well as the declined hydrophobic interaction between SMZ and soil organic matter.The obtained results provide helpful information for the contribution of soil physicochemical characteristics to the transport behaviors of sulfonamide antibiotics in soil-water systems.

关 键 词：磺胺类 土壤 水化学 迁移 

分 类 号：X53[环境科学与工程—环境工程]