title: Photolysis study of perfluoro-2-methyl-3-pentanone under natural sunlight conditions.
abstract: The UV-vis and infrared absorption cross sections of perfluoro-2-methyl-3-pentanone (CF3CF2C(O)CF(CF3)2, 1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-penta none), has been obtained, and a photolysis study was carried out under natural sunlight conditions in the European simulation chamber, Valencia, Spain (EUPHORE). The photolysis loss rate, J(photol), equaled (6.4 +/- 0.3) x 10(-6) s(-1) in the period of 10-14 GMT, July 14, 2003 in Valencia (0.5 W, 39.5 N) and corresponded to an effective quantum yield of photolysis of 0.043 +/- 0.011 over the wavelength range of 290-400 nm; the error limits correspond to 2sigma from the statistical analyses. The atmospheric lifetime of CF3CF2C(O)CF(CF3)2 is estimated to be around 1 week, and the global warming potential of the compound is negligible.
authors.affiliation: Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, 0315 Oslo, Norway.
authors.forename: Barbara
authors.initials: B
authors.lastname: D'Anna
authors.forename: Stig R
authors.initials: SR
authors.lastname: Sellevåg
authors.forename: Klaus
authors.initials: K
authors.lastname: Wirtz
authors.forename: Claus J
authors.initials: CJ
authors.lastname: Nielsen
mesh_terms: D005411:Flame Retardants / Q000378:metabolism*; D005466:Fluorocarbons / Q000378:metabolism*; D010422:Pentanones / Q000378:metabolism*; D010782:Photolysis; D013472:Sunlight
chemical_list: D005411:Flame Retardants; D005466:Fluorocarbons; D010422:Pentanones; C508040:perfluoro-2-methyl-3-pentanone