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Sorption of oxytetracycline in particulate organic matter in soils and sediments: Roles of pH, ionic strength and temperature

文献类型： 外文期刊

作者： Liu, Xinghua 1 ; Zhang, Haibo 2 ; Luo, Yongming 3 ; Zhu, Rongsheng 1 ; Wang, Huaizhong 1 ; Huang, Baohua 1 ;

作者机构： 1.Shandong Acad Agr Sci, Key Lab Livestock Dis Control & Breeding, Inst Anim Sci & Vet Med, Jinan 250100, Jinan, Peoples R China

2.Zhejiang A&F Univ, Sch Environm & Resource Sci, Key Lab Soil Contaminat Bioremediat Zhejiang Prov, Hangzhou 311300, Peoples R China

3.Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Peoples R China

4.Chinese Acad Sci, Yantai Inst Coastal Zone Res, Key Lab Coastal Environm Proc & Ecol Remediat, Yantai 264003, Peoples R China

关键词： Sorption; Oxytetracycline; Soil; Particulate organic matter; Organic functional groups

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2020 年 714 卷

页码：

收录情况： SCI

摘要： Particulate organic matter (POM) is a fraction of organic matter with dissimilar properties in different soils. POM isolated from soils and sediments (wetland, oil waste field, farmlands and aquaculture pond sediment) was used to study its sorption behavior on the antibiotic oxytetracydine (OTC). Impacts of solution pH, ionic strength and temperature on the OTC sorption were studied. The sorption rates of OTC in POM from wetland (POM-w) and farmland (POM-f1, POM-f2) were rapid during the first 3 h and gradually decreased with reaction time until reaching the equilibrium. Linear sorption occurred from 3 to 12 h in POM from oil waste field land (POM-o) and aquaculture pond sediment ( POM-a). The organic carbon normalized partition coefficient (k(oc)) varied from 215.0 to 4493.6 L kg(-1), and it was nearly 10x higher for the POM-w, POM-f1 and POM-f2 than in the POM-o and POM-a. Sorption of OTC by POM exhibited strong pH dependence. Ionic factors affected OTC sorption in POM-f1, POM-12 and POM-a. The sorption capacity declined >50% in a solution with Ca2+ compared to other ions with similar ionic strength. Sorption thermodynamics showed an entropy increasing and endothermic progress during the OTC sorption in POM, implying a spontaneous sorption process. Several mechanisms were involved in OTC sorption in POM, including hydrogen bonding, cation exchange, hydrophobic partitioning and surface complexation. (C) 2020 Elsevier B.V. All rights reserved.

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