title: Photodegradation of halobenzenes in water ice.
abstract: Results from the photolysis of o, p-dichlorobenzene, bromobenzene, and p-dibromobenzene in water ice are reported. All phototransformations appeared to be based on dehalogenation, coupling, and rearrangement reactions in ice cavities. No photosolvolysis products, i.e. products from intermolecular reactions between organic and water molecules, were found. Many of the products were very toxic substances of a high environmental risk, such as PCBs. The results support our model, in which secondary, very toxic, pollutants can be formed in ice, snow, and atmospheric ice particles from primary pollutants through the action of solar irradiation. The photoproducts may be released to the environment by ice melting and evaporation.
authors.affiliation: Department of Organic Chemistry, Faculty of Science, Masaryk University, Kotlarska 2, 611 37 Brno, Czech Republic.Klan@sci.muni.cz
authors.forename: P
authors.initials: P
authors.lastname: Klán
authors.forename: D
authors.initials: D
authors.lastname: Del Favero
authors.forename: A
authors.initials: A
authors.lastname: Ansorgová
authors.forename: J
authors.initials: J
authors.lastname: Klánová
authors.forename: I
authors.initials: I
authors.lastname: Holoubek
mesh_terms: D001555:Benzene Derivatives / Q000737:chemistry*; D004784:Environmental Monitoring; D007053:Ice; D008962:Models, Theoretical; D010782:Photolysis; D014872:Water Movements
chemical_list: D001555:Benzene Derivatives; D007053:Ice