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Dissolved Organic Matter-Ofloxacin Interaction as Affected by Metal Ions

机译：受金属离子影响的溶解有机物 - 氧氟沙星相互作用

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A dialysis equilibrium system was applied to investigate the roles of Cu (II) and Mg(II) on DOM-ofloxacin (OFL) interaction. The binding behavior of both cations and OFL were studied. The introduction of Cu(II) increased DOM-OFL interaction, while Mg(II) decreased DOM-OFL binding. Cu(II) binding to DOM was also increased by OFL, while Mg(II) binding was decreased by OFL. The change in OFL binding amount in the absence and presence of cations (ΔC_b) was calculated and compared with cation binding (C_b~m). ΔC_b/C_b~m was in the range of 1-3 for Cu(II), depending on the applied Cu concentration. Two ternary complexes of DOM-OFL-Cu and DOM-Cu-OFL were proposed. For Mg(II), AΔC_b/C_b~m was around — 1 at Mg(II) concentrations lower than 1 mM but decreased to —5 with increasing Mg(II) concentration. The competitive effect of Mg(II) to OFL was thus proposed.
机译：应用透析平衡体系以研究Cu（II）和Mg（II）对氧氟沙星（OF1）相互作用的作用。 研究了阳离子和OFL的结合行为。 Cu（II）的引入增加了相互作用的差异，而Mg（ii）降低了结合的DOM-OF-1。 OF1也增加了与DOM的Cu（II）Cu（II）的结合，而Mg（II）结合通过OF1降低。 计算不存在和存在阳离子（ΔC_B）的OFL结合量的变化，并与阳离子结合（C_B〜M）进行比较。 ΔC_B/ C_B〜M在Cu（II）的范围内，取决于所施加的Cu浓度。 提出了两个三元复合物的DOM-Cu和DOM-Cu-OF1。 对于Mg（II），ΔC_B/ C_B〜M在低于1mm的Mg（II）浓度下约为1，但随着Mg（II）浓度的增加而降至-5。 因此提出了MG（II）至OFL的竞争作用。

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