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Indexed by:期刊论文

Date of Publication:2010-05-01

Journal:CHINESE SCIENCE BULLETIN

Included Journals:SCIE

Volume:55

Issue:15

Page Number:1495-1500

ISSN No.:1001-6538

Key Words:gatifloxacin; photodegradation; influencing factors; reactive oxygen species

Abstract:Fluoroquinolone antibiotics (FQs) are frequently detected as emerging pollutants in aqueous environments. In this study, kinetics, influencing factors and mechanisms on the photodegradation of gatifloxacin, a representative FQ, were investigated. The photodegradation follows the pseudo-first-order kinetics. Gatifloxacin photodegrades with a quantum yield of (5.94 +/- 0.95) x 10(-3) in pure water and undergoes direct photolysis as well as self-sensitized photodegradation. The FQ photodegrades slower in freshwater and seawater than in pure water, which is attributed to the integrative effects of pH and the aqueous dissolved matter (e.g., humic acids and NO(3)(-)) on the photodegradation. A toxicity test using Vibrio fischeri revealed the formation of hazardous photo-products.