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Indexed by:期刊论文
Date of Publication:2010-01-01
Journal:科学通报
Included Journals:PKU、ISTIC、CSCD
Volume:55
Issue:11
Page Number:996-1001
ISSN No.:0023-074X
Key Words:加替沙星; 光降解; 影响因素; 活性氧物种
Abstract:氟喹诺酮类抗生素是在水环境中不断被检出的新兴污染物,研究其环境行为和毒理效应具有重要意义.加替沙星是一种代表性氟喹诺酮类抗生素,本研究考察了模拟
日光照射下,水中加替沙星的光降解动力学,影响因素与机理.加替沙星的光解遵循准一级反应动力学.纯水中加替沙星发生了直接光解及·OH和1O2参与的自
敏化光解,其表观光解量子产率为(5.940.95)*10-3.与纯水中相比,加替沙星在淡水,海水中光解较慢,这归因于pH及水中溶解性物质的复合影
响.在pH5~11范围内,加替沙星在其等电点附近光解最快.Cl-和Fe(Ⅲ)对其光解动力学没有显著影响(P{L-End}>0.05),而腐殖酸(
HA)和NO3-明显抑制其光解(P{L-End}<0.1).HA和NO3-可以通过光掩蔽效应减慢加替沙星的光解,或者捕获·OH和1O2,抑制自敏
化光解.发光菌(Vibriofischeri)毒性实验表明,加替沙星光降解生成了具有较高风险的中间产物
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