中文摘要：

氟喹诺酮（FQs）在环境中经常被检出,会诱导抗药细菌和人体抗性基因的产生。自然水体中溶解性物质对FQs的光解具有显著影响。以氙灯作为光源,测定了9种FQs在5个黄河河口水样中的光解速率常数,并研究了NO_3--、Cl--和溶解性有机质（DOM）对巴洛沙星的光解速率常数的复合影响。结果表明,9种FQs的水解和生物降解等过程可以忽略不计,其在水样中的光解过程都可以用一级动力学方程来描述,但速率常数差异很大。其中,洛美沙星的光解速率常数最大,巴洛沙星的光解速率常数最小,因此巴洛沙星可能的环境风险最大。NO_3--对巴洛沙星的光解过程具有显著的促进作用,Cl-具有显著的抑制作用,而DOM对巴洛沙星的光解过程影响不显著。NO_3--、Cl--和DOM对巴洛沙星的光解过程的复合影响不是简单的线性关系,而是存在一定的交互作用。

英文摘要：

Fluoroquinolones （FQs） were frequently detected in environment, which would cause resistance bacteria and gene. Photodegradation of FQs was significantly affected by dissolved matters. Photodegradation rate constants of 9 FQs were determined in 5 water samples collected from the Yellow River Estuary under xenon lamp. The combined effects of NO3 , Cland dissoved organic matter （DOM） on the photodegradation rate constant of balofloxacin were discussed. Results showed that the hydrolysis and biodegradation of 9 FQs could be ignored. The 9 FQs photodegraded in water samples fitting first-order dynamic equation,but their photodegradation rate constants varied. The photodegradation rate constant of lomefloxacin was highest while that of balofloxacin lowest. Therefore.balofloxacin might pose highest risk to environment. The effect of NO3 promoted photodegradation on balofloxacin, that of Cl inhibited photodegradation and that of DOM on balofloxacin photodegradation was not significant. The combined effects of NO3 , Cl and DOM were not linear,but had interactive effects.