title: Phototransformation of ibuprofen and ketoprofen in aqueous solutions.
abstract: The UV (254 nm) and UV/VUV (254/185 nm) photolysis of two anti-inflammatory drugs, ibuprofen and ketoprofen, have been studied in aqueous solutions as a possible process for the removal of non-biodegradable compounds. We have examined the effects of dissolved oxygen and initial target concentration. Upon irradiation at 254 nm, the decomposition rate of ketoprofen is almost forty times higher as it of ibuprofen whilst VUV irradiation only increased the ibuprofen decomposition rate. The presence of dissolved oxygen accelerated the photodegradation of ibuprofen, whereas no effect was observed on the degradation of ketoprofen. The maximum quantum yield for the phototransformation was 0.2. The rate of mineralization in both cases was ∼60%, even after 1h of treatment and this suggests the formation of stable by-products which were identified using GC-MS and HPLC-MS, respectively.
authors.affiliation: Department of Inorganic and Analytical Chemistry, University of Szeged, 6720 Szeged, Dóm tér 7, Hungary.
authors.forename: R K
authors.initials: RK
authors.lastname: Szabó
authors.forename: Cs
authors.initials: C
authors.lastname: Megyeri
authors.forename: E
authors.initials: E
authors.lastname: Illés
authors.forename: K
authors.initials: K
authors.lastname: Gajda-Schrantz
authors.forename: P
authors.initials: P
authors.lastname: Mazellier
authors.forename: A
authors.initials: A
authors.lastname: Dombi
mesh_terms: D002851:Chromatography, High Pressure Liquid; D052918:Environmental Restoration and Remediation; D008401:Gas Chromatography-Mass Spectrometry; D007052:Ibuprofen / Q000737:chemistry*; D007660:Ketoprofen / Q000737:chemistry*; D007700:Kinetics; D013058:Mass Spectrometry; D010100:Oxygen / Q000737:chemistry; D010782:Photolysis; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water; D007660:Ketoprofen; D010100:Oxygen; D007052:Ibuprofen