title: UV-C photolysis of endocrine disruptors. The influence of inorganic peroxides.
abstract: Norfloxacin, doxycycline and mefenamic acid have been photolysed with UV-C radiation (254 nm) in the presence and absence of inorganic peroxides (hydrogen peroxide or sodium monopersulfate). Quantum yields in the range (1.1-4.5)x10(-3) mol Einstein(-1) indicate the low photo-reactivity of these pharmaceuticals. Inorganic peroxides considerably enhanced the contaminants conversion, although no appreciable mineralization could be obtained. A simplistic reaction mechanism for the hydrogen peroxide promoted experiments allowed for a rough estimation of the rate constant between hydroxyl radicals and norfloxacin (k>1 x 10(9)M(-1)s(-1)), doxycycline (k>1.5 x 10(9)M(-1)s(-1)) and mefenamic acid (k>11.0 x 10(9)M(-1)s(-1)).
authors.affiliation: Departamento de Ingeniería Química y Química Física, Facultad de Ciencias, Avenida de Elvas S/N, 06071 Badajoz, Spain. fjrivas@unex.es
authors.forename: Javier
authors.initials: J
authors.lastname: Rivas
authors.forename: Olga
authors.initials: O
authors.lastname: Gimeno
authors.forename: Teresa
authors.initials: T
authors.lastname: Borralho
authors.forename: Maria
authors.initials: M
authors.lastname: Carbajo
mesh_terms: D004318:Doxycycline / Q000737:chemistry*; D052244:Endocrine Disruptors / Q000737:chemistry*; D007700:Kinetics; D008528:Mefenamic Acid / Q000737:chemistry*; D009643:Norfloxacin / Q000737:chemistry*; D010545:Peroxides / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D052244:Endocrine Disruptors; D010545:Peroxides; D008528:Mefenamic Acid; D009643:Norfloxacin; D004318:Doxycycline