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Biochar impacts on sorption-desorption of oxytetracycline and florfenicol in an alkaline farmland soil as affected by field ageing

机译:生物炭对田间老化对碱性农田土壤中土霉素和氟苯尼考的​​吸附-解吸的影响

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摘要

Few studies have been conducted to examine the effects of biochar amendment on sorption and desorption of antibiotics in alkaline soils under field ageing conditions. In this study, sorption and desorption of two antibiotics (oxytetracycline (OTC) and florfenicol (FFC)) were investigated for a calcareous farmland soil with different biochar treatments (1 and 5 wt%, including fresh and aged soil-biochar mixtures). The fresh and recovered field-aged biochar particles were characterized by various methods. The results indicated that, after one-year-field-ageing, the abundance of amorphous carbon on biochar surface and the carbon content of biochar particles decreased markedly whereas the surface area and the oxygen-containing functional groups increased. It was found in batch experiments that the effects of biochar application and ageing on sorption and desorption characteristics were apparently different between the two antibiotics. OTC (a more hydrophobic and less polar antibiotic) showed much higher sorption capacity than FFC. Biochar-derived dissolved organic matter (DOM) was found to compete for sorption sites on soil surface, particularly for the 5wt%-freshly-amended soil. The adherent excessive DOM had lowered OTC sorption and enhanced its partitioning to the solution phase. On the other hand, enhanced partitioning of FFC to the amorphous carbon of biochar accounted for the observed increase of its sorption to the soils with fresh biochar amendment. However, the above effects on sorption affinity for both antibiotics weakened after ageing in the studied calcareous purple soil. Thus, due attention should be paid to the potential risk of leaching increase of OTC in alkaline soils upon biochar amendment, particularly within the very beginning period after application. (C) 2019 Elsevier B.V. All rights reserved.
机译:在田间老化条件下,很少有研究研究生物炭改良剂对碱性土壤中抗生素吸附和解吸的影响。在这项研究中,研究了两种生物炭处理(1和5 wt%,包括新鲜和老化的土壤生物炭混合物)对钙质农田土壤中两种抗生素(土霉素(OTC)和氟苯尼考(FFC))的吸附和解吸。通过各种方法对新鲜和回收的田间生物炭颗粒进行了表征。结果表明,经过一年的老化,生物炭表面的无定形碳丰度和生物炭颗粒的碳含量明显降低,而表面积和含氧官能团却增加。在分批实验中发现,两种抗生素之间生物炭施用和老化对吸附和解吸特性的影响明显不同。 OTC(一种疏水性更强,极性较小的抗生素)显示出比FFC高得多的吸附能力。发现生物炭来源的溶解有机物(DOM)竞争土壤表面的吸附位点,尤其是5wt%的新鲜改良土壤。附着的过量DOM降低了OTC吸附并增强了其在溶液相中的分配。另一方面,FFC在生物炭无定形碳中的分配增加,说明了使用新鲜生物炭改良剂可观察到其对土壤的吸附增加。然而,在研究的钙质紫色土壤中,上述对两种抗生素的吸附亲和力的影响在老化后减弱。因此,应适当注意生物炭改良后碱土中OTC浸出增加的潜在风险,尤其是在施用后的最开始时期。 (C)2019 Elsevier B.V.保留所有权利。

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  • 来源
    《The Science of the Total Environment》 |2019年第25期|928-936|共9页
  • 作者单位

    Southwest Jiaotong Univ, Fac Geosci & Environm Engn, Chengdu 611756, Sichuan, Peoples R China|Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Sichuan, Peoples R China;

    Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Sichuan, Peoples R China;

    Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Sichuan, Peoples R China;

    Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Sichuan, Peoples R China|Univ Chinese Acad Sci, Beijing 100049, Peoples R China;

    Southwest Jiaotong Univ, Fac Geosci & Environm Engn, Chengdu 611756, Sichuan, Peoples R China;

    Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Sichuan, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biochar; Antibiotics; Ageing; Dissolved organic matter; Amorphous carbon; Purple soil;

    机译:生物炭抗生素老化溶解性有机质非晶碳紫色土壤;
  • 入库时间 2022-08-18 04:24:25

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