Dabieshan National Observation and Research Field Station of Forest Ecosystem at Henan, International Joint Research Laboratory for Global Change Ecology, School of Life Sciences, Henan University, Kaifeng, 475004, China.
Henan Joint International Research Laboratory of Environmental Pollution Control Materials, College of Chemistry and Molecular Sciences, Henan University, Kaifeng, 475004, China.
Environ Sci Pollut Res Int. 2024 Feb;31(8):11622-11632. doi: 10.1007/s11356-024-31966-2. Epub 2024 Jan 15.
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 sulfanilamide (SNM, a typical sulfonamide antibiotic) through saturated soils with different physicochemical characteristics were investigated. The results showed that the physicochemical characteristics controlled SNM mobility. Generally, the mobility of SNM 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 SNM 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 SNM transport in the soils. Unlike Na, Cu ions could act as bridging agents between the soil grains and SNM molecules, contributing to the relatively weak transport of SNM. Furthermore, the trend of SNM mobility in different soil columns was unaffected by solution pH (5.0-9.0). Meanwhile, for a given soil, the SNM mobility was promoted as the solution pH values increased, which was caused by the enhanced electrostatic repulsion between SNM species and soil particles as well as the declined hydrophobic interaction between SNM 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.
鉴定磺胺类抗生素在土壤中的迁移有助于更好地了解这些普遍存在的污染物在环境中的归宿和行为。本研究考察了具有不同物理化学特性的饱和土壤中磺胺甲恶唑（SNM，一种典型的磺胺类抗生素）的迁移特性。结果表明，物理化学特性控制着 SNM 的迁移性。一般来说，SNM 的迁移性与 CEC 值和土壤有机质含量呈正相关，这主要与土壤有机质与 SNM 分子之间通过π-π堆积、氢键、配体交换和疏水相互作用的相互作用有关。此外，较高的粘土矿物含量和较低的砂含量有利于抑制 SNM 在土壤中的迁移。与 Na 不同，Cu 离子可以作为土壤颗粒和 SNM 分子之间的桥接剂，导致 SNM 的相对较弱的迁移。此外，不同土壤柱中 SNM 迁移性的趋势不受溶液 pH 值（5.0-9.0）的影响。同时，对于给定的土壤，随着溶液 pH 值的升高，SNM 的迁移性得到了促进，这是由于 SNM 物种与土壤颗粒之间的静电排斥增强以及 SNM 与土壤有机质之间的疏水相互作用减弱所致。研究结果为土壤物理化学特性对土壤-水系统中磺胺类抗生素迁移行为的贡献提供了有价值的信息。
