Effect of cation type in mixed Ca-Na systems on transport of sulfonamide antibiotics in saturated limestone porous media

Effect of cation type in mixed Ca-Na systems on transport of sulfonamide antibiotics in saturated limestone porous media
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混合 Ca-Na 体系中阳离子类型对饱和石灰石多孔介质中磺酰胺类抗生素输运的影响

DOI:
10.1007/s11356-019-04561-z
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发表时间:
2019-02
影响因子:
5.8
通讯作者:
Wu JC
Wu JC
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Sun KX;Sun YY;Gao B;Xu HX;Wu JC

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磺胺类化合物在地下水中的滞留和迁移会严重影响地下水水质。在这项工作中,进行了一系列的实验室批量吸附和柱传输实验,以确定阳离子类型的混合Ca-Na系统的保留和传输的两个典型的SA,磺胺二甲氧嘧啶(SDM)和磺胺醋酰(SCA),在饱和石灰石多孔介质中的效果。柱实验数据表明,在饱和石灰岩介质中,二价阳离子Ca 2+比一价阳离子Na+在降低仅SDM在共阳离子系统中的传输方面发挥更重要的作用。此外,在单阳离子(即,(包括Ca 2+或Na+)体系中,增加NaCl或CaCl 2的离子强度(IS)对SCA的运移影响不大,而增加CaCl 2的IS则促进了SDM在饱和石灰岩多孔介质中的滞留。这主要是由于Ca ~(2+)对SDM和石灰石的阳离子架桥作用。总体而言,SDM在石灰石柱中的保留率比SCA高得多,这可以归因于两种SA的不同理化性质。石灰石对这两种SA的截留能力强于石英砂。这项研究的结果表明,阳离子类型和某些电解质的浓度(例如,CaCl 2)和培养基型在控制抗生素的环境归宿和运输中起着重要作用。
Retention and transport of sulfonamides (SAs) in subsurface can strongly affect groundwater quality. In this work, a range of laboratory batch sorption and column transport experiments were conducted to determine the effect of cation type in mixed Ca-Na systems on the retention and transport of two typical SAs, sulfadimethoxine (SDM) and sulfacetamide (SCA), in saturated limestone porous media. Column experimental data showed divalent cation Ca2+played a more important role than monovalent cation Na+in decreasing the transport of only SDM in co-cation systems in the saturated limestone media. Further, in the single-cation (i.e., including either Ca2+or Na+) system, increasing ionic strength (IS) of either NaCl or CaCl2had little effect on SCA transport; however, increasing of IS of CaCl2promoted the retention of SDM in the saturated limestone porous media. This is mainly due to the cation bridging effect of Ca2+on SDM and limestone. Overall, SDM showed much higher retention in the limestone columns than SCA, which can be attributed to the two SAs’ different physicochemical properties. Moreover, limestone showed stronger ability to retain the two SAs than quartz sand. Findings in this study suggest that cation type and the concentration of certain electrolyte (e.g., CaCl2) as well as medium type play an important role in controlling the environmental fate and transport of antibiotics.
中国抗生素抗性基因:发生、风险及不同参数之间的相关性。
DOI: 10.1007/s11356-018-2507-z
发表时间: 2018
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