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首页> 外文期刊>Environmental Science & Technology >Sorption of Ciprofloxacin and Oxytetracycline Zwitterions to Soils and Soil Minerals: Influence of Compound Structure
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Sorption of Ciprofloxacin and Oxytetracycline Zwitterions to Soils and Soil Minerals: Influence of Compound Structure

机译：环丙沙星和土霉素两性离子对土壤和土壤矿物质的吸附：复合结构的影响

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摘要

Oxytetracycline (OTC) zwitterions sorbed to a greater extent than ciprofloxacin (CIP) zwitterions onto goethite and soils with moderate-to-low effective cation exchange capacities (ECEC < 10 cmol_c/kg) because adjacent pairs of hydroxyl groups on the OTC molecule (absent in CIP) facilitated greater surface complexation to soil metal oxides and aluminosilicate edge sites. CIP sorbed to a higher'extentthan OTC onto aluminosilicates and onto soils with "high" ECEC values (> 10 cmol_c/kg). The sorption of heterocyclic compounds structurally similar to CIP indicated that both positive charge localization on the cationic amine and the extent of charge delocalization to the heterocyclic ring influenced molecular orientation within the montmorillonite interlayers, van der Waals interactions, and the potential for sorption. The sorption of compounds structurally similar to OTC revealed that greater positive charge localization on the cationic amine facilitated sorption to montmorillonite, whereas ortho substituted anionic and cationic groups on a zwitterionic molecule resulted in unfavorable Coulombic interactions between the anionic moiety and the negatively charged surface and hindered sorption. Thus, greater CIP zwitterion sorption to aluminosilicates and "high" ECEC soils resulted from greater distance between the anionic and cationic groups, which maximized Coulombic attraction to the surface.
机译：土霉素两性离子比环丙沙星（CIP）两性离子在具有中等至低有效阳离子交换能力（ECEC <10 cmol_c / kg）的针铁矿和土壤上吸附的程度更大，因为OTC分子上相邻的羟基对（不存在）在CIP中）促进了与土壤金属氧化物和硅铝酸盐边缘部位更大的表面络合。 CIP以比OTC更高的程度吸附到铝硅酸盐和ECEC值较高（> 10 cmol_c / kg）的土壤上。在结构上类似于CIP的杂环化合物的吸附表明，阳离子胺上的正电荷定位以及杂环中电荷离域的程度都影响了蒙脱石中间层内的分子取向，范德华相互作用和吸附潜力。结构上与OTC相似的化合物的吸附表明，阳离子胺上更大的正电荷局部化促进了对蒙脱石的吸附，而两性离子分子上的邻位取代的阴离子和阳离子基团导致阴离子部分与带负电荷的表面之间发生不利的库仑相互作用，并受阻吸附。因此，更大的CIP两性离子对铝硅酸盐和“高” ECEC土壤的吸附是由于阴离子基团和阳离子基团之间的距离更大，从而使库仑吸附力最大化。

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