Institute of Animal Science and Veterinary Medicine Shandong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Control and Breeding, Jinan, 250100, China; Key Laboratory of Livestock and Poultry Multi-omics of MARA, Jinan, 250100, China.
Institute of Animal Science and Veterinary Medicine Shandong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Control and Breeding, Jinan, 250100, China; Key Laboratory of Livestock and Poultry Multi-omics of MARA, Jinan, 250100, China.
J Environ Manage. 2024 Nov;370:122436. doi: 10.1016/j.jenvman.2024.122436. Epub 2024 Sep 10.
Soil aggregates organic matter (SAOM) is composed of free particulate organic matter (fPOM), intra-aggregate particulate organic matter (iPOM), and mineral-associated organic matter (mSOM), which are major antibiotic sorbents that play a significant role in the soil organic matter (SOM) turnover process. To date, the oxytetracycline (OTC) sorption and desorption behavior and mechanisms on SAOM have not been contrastively analyzed. SAOM organic components have been used to study scientific problems and to determine their influence on the fate and migration of OTC among the SOM turnover process. Results demonstrated that SAOM had great OTC sorption capacity ranging from approximately 12100-513,000 mg kg and the desorption proportion was no more than 33.60%. The slow organic carbon pool (mSOM) had greater OTC accumulation capacity than the intermediate active pool (iPOM) and the active pool (fPOM), while OTC was more likely to reside in the active pool in wetlands (fPOM-w) and oil waste land (fPOM-o) than the organic carbon pool (mSOM-f) in farmland with human activity interference. The hysteresis was affected by SAOM's physical surface characteristics when the OTC initial equilibrium sorption concentration was higher than 200 mg L. When it was lower than that, it was affected by the organic carbon composition. Hydrogen bonds, electrostatic interactions, and π-π interactions dominated the SAOM-OTC interactions. The results of this study will be useful for evaluating the long-term behavior and migration of antibiotics in SOM turnover processes and could refine risk assessments of antibiotics contamination in soil environmental systems.
土壤团聚体有机质（SAOM）由游离颗粒有机质（fPOM）、内团聚体颗粒有机质（iPOM）和矿物结合有机质（mSOM）组成，它们是主要的抗生素吸附剂，在土壤有机质（SOM）转化过程中起着重要作用。迄今为止，尚未对比分析土霉素（OTC）在 SAOM 上的吸附和解吸行为和机制。已经使用 SAOM 有机成分来研究科学问题，并确定它们在 SOM 转化过程中对 OTC 命运和迁移的影响。结果表明，SAOM 具有很大的 OTC 吸附能力，范围约为 12100-513000mgkg，解吸比例不超过 33.60%。慢碳库（mSOM）比中间活性库（iPOM）和活性库（fPOM）具有更大的 OTC 积累能力，而在受到人类活动干扰的农田中，OTC 更有可能存在于湿地（fPOM-w）和油废地（fPOM-o）的活性库中，而不是在没有活性库中（mSOM-f）。当 OTC 初始平衡吸附浓度高于 200mgL 时，SAOM 的物理表面特性会影响滞后性。当浓度低于该值时，它会受到有机碳组成的影响。氢键、静电相互作用和π-π相互作用主导着 SAOM-OTC 相互作用。本研究的结果将有助于评估抗生素在 SOM 转化过程中的长期行为和迁移，并且可以完善土壤环境系统中抗生素污染的风险评估。
