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Significant Effect of Evaporation Process on the Reaction of Sulfamethoxazole with Manganese Oxide.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-04-01 , DOI: 10.1021/acs.est.9b07455 Jingchen Li 1 , Lin Zhao 1 , Ching-Hua Huang 2 , Huichun Zhang 3 , Ruochun Zhang 4 , Samreen Elahi 1 , Peizhe Sun 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-04-01 , DOI: 10.1021/acs.est.9b07455 Jingchen Li 1 , Lin Zhao 1 , Ching-Hua Huang 2 , Huichun Zhang 3 , Ruochun Zhang 4 , Samreen Elahi 1 , Peizhe Sun 1
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Soil in the vadose zone is an important sink for antibiotics. However, previous studies have examined only the degradation of antibiotics in soil slurry systems, which were largely different from real-world unsaturated soil environments. Whether the same transformation mechanisms apply to unsaturated soil systems has been a question. Here, the degradation of sulfamethoxazole (SMX) by manganese dioxide (γ-MnO2) in both suspension systems and evaporation processes were examined. Results show that the slow degradation of SMX in the suspension system can be significantly promoted as the water gradually evaporates. SMX degraded differently in evaporation as compared to suspension systems because of the quenching effect of generated Mn2+. Transformation products of SMX in both systems also showed different toxicity toward Escherichia coli because of different evolutions of intermediates. This study has strong implications for the assessment and prediction of the transformation and fate of antibiotics in natural soil environments.
中文翻译：
蒸发过程对磺胺甲恶唑与氧化锰反应的重要影响。
渗流区的土壤是重要的抗生素汇。但是，以前的研究仅研究了土壤泥浆系统中抗生素的降解情况，这与现实世界中的非饱和土壤环境有很大不同。是否将相同的转换机制应用于非饱和土壤系统一直是一个问题。在此，研究了悬浮体系和蒸发过程中二氧化锰（γ-MnO2）对磺胺甲恶唑（SMX）的降解。结果表明，随着水的逐渐蒸发，悬浮液中SMX的缓慢降解会得到明显促进。与悬浮系统相比，SMX在蒸发中的降解程度有所不同，这是因为生成的Mn2 +具有淬灭作用。由于中间体的不同进化，两个系统中SMX的转化产物对大肠杆菌的毒性也不同。这项研究对于评估和预测天然土壤环境中抗生素的转化和命运具有重要意义。
更新日期：2020-04-23
中文翻译：
蒸发过程对磺胺甲恶唑与氧化锰反应的重要影响。
渗流区的土壤是重要的抗生素汇。但是，以前的研究仅研究了土壤泥浆系统中抗生素的降解情况，这与现实世界中的非饱和土壤环境有很大不同。是否将相同的转换机制应用于非饱和土壤系统一直是一个问题。在此，研究了悬浮体系和蒸发过程中二氧化锰（γ-MnO2）对磺胺甲恶唑（SMX）的降解。结果表明，随着水的逐渐蒸发，悬浮液中SMX的缓慢降解会得到明显促进。与悬浮系统相比，SMX在蒸发中的降解程度有所不同，这是因为生成的Mn2 +具有淬灭作用。由于中间体的不同进化，两个系统中SMX的转化产物对大肠杆菌的毒性也不同。这项研究对于评估和预测天然土壤环境中抗生素的转化和命运具有重要意义。
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