title: Formation of organobrominated compounds in the presence of bromide under simulated atmospheric aerosol conditions.
abstract: Photobromination of phenol takes place upon UV/Vis irradiation of FeIII and bromide under acidic conditions, and most likely involves the brominating agent Br2(-*). Bromination is also observed in the presence of nitrate and bromide under UV irradiation, most likely involving Br2(-*) formed upon oxidation of bromide by *OH. Moreover, quantitative bromination of phenol is observed in the dark in the presence of hydrogen peroxide and bromide. This process is strongly favored under acidic conditions, but a residual, pH-independent bromination pathway is also present. The rates and yields of bromination (up to 100%) are considerably higher than those reported for chlorination under comparable conditions, suggesting that the higher activity of bromine species could compensate for the lower concentration of bromide ions in aerosol compared to chlorides. The reported processes are potent tial sources of reactive bromine species (Br2(-*), HBrO) and aromatic bromo derivatives in atmospheric aerosols, in particular after the acidification process linked with aerosol aging.
authors.affiliation: Dipartimento di Chimica Analitica, Università di Torino, Torino, Italy.
authors.forename: Davide
authors.initials: D
authors.lastname: Vione
authors.forename: Valter
authors.initials: V
authors.lastname: Maurino
authors.forename: Simona Cucu
authors.initials: SC
authors.lastname: Man
authors.forename: Swapan
authors.initials: S
authors.lastname: Khanra
authors.forename: Cecilia
authors.initials: C
authors.lastname: Arsene
authors.forename: Romeo-Iulian
authors.initials: RI
authors.lastname: Olariu
authors.forename: Claudio
authors.initials: C
authors.lastname: Minero
mesh_terms: D000336:Aerosols / Q000737:chemistry*; D001272:Atmosphere / Q000737:chemistry*; D001965:Bromides / Q000737:chemistry*; D054879:Halogenation; D006842:Hydrocarbons, Brominated / Q000138:chemical synthesis*; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry; D009566:Nitrates / Q000737:chemistry; D019800:Phenol / Q000737:chemistry*; D010777:Photochemistry
chemical_list: D000336:Aerosols; D001965:Bromides; D006842:Hydrocarbons, Brominated; D009566:Nitrates; D019800:Phenol; D006861:Hydrogen Peroxide; D007501:Iron