天然水体溶解性物质对5种抗生素光解的影响

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摘要建立了分析水体溶解性物质对抗生素光解影响的方法，对比研究了8种典型天然水体成分对3类5种抗生素光解的影响及其作用机制.结果表明，不同水体成分对不同抗生素光解影响呈现很大的差异性.甲砜霉素主要发生间接光解，纯水中光解速率只有1.33×10^-5min^-1，而其他抗生素则同时发生直接光解和间接光解.水体成分中NO₃^-，Fe²⁺和Cl^-主要通过光致活性物种（·OH和¹O₂）影响抗生素光解，DOM主要通过滤光作用影响抗生素光解.另外Ca²⁺和Mg²⁺对不同抗生素的光解影响主要通过其与抗生素分子的络合作用实现，Ca²⁺和Mg²⁺分别促进了恩氟沙星光解（0.3933min^-1和0.2314min^-1），但一定程度上抑制了沙拉沙星的光解（0.0447min^-1和0.0289min^-1）.

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	代志峰
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	阴永光
	孙英杰
	李鹏
	罗永涛

关键词 ：天然水体, 溶解性物质, 抗生素, 光解, 影响

Abstract：A method was established for analyzing the effects of dissolved substances on the photolysis of antibiotics and the differential effects and possible mechanisms of eight typical dissolved substances in natural water on the photolysis of five antibiotics were investigated comparatively. The results demonstrated that the effects of various dissolved substances were much different on the photolysis of these antibiotics. For thiamphenicol, the photolysis rate in pure water was only 1.33×10^-5min^-1 and indirect photolysis was the main photodegradation pathway. However, for other antibiotics, indirect photolysis co-occurred with direct photolysis. The dissolved substances (e.g., NO₃^-, Fe²⁺ and Cl^-) affected the photolysis of antibiotics mainly through photogeneration of ·OH and ¹O₂. Dissolved organic matter decreased the photolysis of antibiotics through light attenuation. In addition, Ca²⁺ and Mg²⁺ could influence the photolysis of antibiotics through their complexation with antibiotics. It was observed that Ca²⁺ and Mg²⁺ promoted the photolysis of enrofloxacin (0.3933min^-1 and 0.2314min^-1, respectively), but inhibited the photolysis of sarafloxacin (0.0447min^-1 and 0.0289min^-1, respectively).

Key words： natural water dissolved substances antibiotics photolysis influence

收稿日期: 2017-11-05

X131

基金资助:国家自然科学基金资助项目（21377156）；河南省高校科技创新团队项目（16IRTSTHN014）

作者简介: 代志峰(1992-),男,河南安阳人,河南理工大学硕士研究生,主要从事环境有机地化方面研究.发表论文2篇.

引用本文:

代志峰, 邰超, 张少栋, 阴永光, 孙英杰, 李鹏, 罗永涛. 天然水体溶解性物质对5种抗生素光解的影响[J]. 中国环境科学, 2018, 38(6): 2273-2282. DAI Zhi-feng, TAI Chao, ZHANG Shao-dong, YIN Yong-guang, SUN Ying-jie, LI Peng, LUO Yong-tao. Influence of dissolved substances in natural water on the photolysis of five antibiotics. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(6): 2273-2282.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2018/V38/I6/2273

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