天然水体溶解性物质对5种抗生素光解的影响

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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

Received: 05 November 2017

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Corresponding Authors: 邰超,教授,taichao@126.com E-mail: taichao@126.com

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	Articles by authors
	DAI Zhi-feng
	TAI Chao
	ZHANG Shao-dong
	YIN Yong-guang
	SUN Ying-jie
	LI Peng
	LUO Yong-tao

Cite this article:

DAI Zhi-feng,TAI Chao,ZHANG Shao-dong等. Influence of dissolved substances in natural water on the photolysis of five antibiotics[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(6): 2273-2282.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I6/2273

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