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Photolytic debromination and degradation of decabromodiphenyl ether, an exploratory kinetic study in toluene

Titelangaben

Barcellos da Rosa, Marcelo ; Krüger, Heinz-Ulrich ; Thomas, Sebastian ; Zetzsch, Cornelius:
Photolytic debromination and degradation of decabromodiphenyl ether, an exploratory kinetic study in toluene.
In: Fresenius Environmental Bulletin. Bd. 12 (2003) Heft 8 . - S. 940-945.
ISSN 1018-4619

Abstract

The photolysis of decabromodiphenyl ether, dissolved in toluene, was studied using a filtered Xe lamp as solar simulator. A loss of decabromodiphenyl ether, leading to unknown products, and sequential debromination via the nona-, octa-, heptabromodiphenyl ethers was obsd. The photolytic rate const. of decabromodiphenyl ether, kphot = 3 X 10-4 s-1, indicated a high quantum yield > 0.1, of which more than 50% leads to debromination. The debromination rate consts. decreased with the debromination steps, and the decrease can be explained by the decreasing overlap of the UV absorption spectra of the compds. with the spectrum of the lamp, where the decrease can be expected to be similar for sunlight. The UV absorption spectra of diphenylether, 4-bromodiphenyl ether, 4,4'-dibromodiphenyl ether and decabromodiphenyl ether, dissolved in toluene, are presented for the first time. The spectra in the wavelength range from 290 to 360 nm imply a strong diurnal, seasonal and latitudinal dependence of environmental photolysis rates.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER26052
Institutionen der Universität: Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 12 Nov 2015 07:43
Letzte Änderung: 12 Nov 2015 07:43
URI: https://eref.uni-bayreuth.de/id/eprint/22227