Weitergehende Oxidationsverfahren in der Trinkwasseraufbereitung -Desinfektionsmittelminimierung und Verringerung des Wiederverkeimungspotentials. Bd. 2. T. 5: Abbaukinetik Abschlussbericht

Within the framework of a study regarding the formation of OH radicals in the ozone/hydrogen peroxide system, a method was elaborated that allows the determination of the OH radical in the presence of ozone. This is based on the formation of the t-butanol-oxidation product formaldehyde in the presence of a large excess of this alcohol. With tertiary amines, e.g. EDTA, ozone reacts rapidly not only by O-atom transfer under formation of amine oxides, but also via one-electron oxidation, resulting in the amine radical cation and an OH radical. The kinetics of this reaction was studied for the case of EDTA by pulse radiolysis, showing the involvement of a short-lived amino-type radical cation. Superoxide, another intermediate in ozonated systems, also reduces ozone to the OH radical, thereby enhancing ozone degradation. OH radicals are moreover formed in the autoxidation of Fe(II)EDTA via intermediate hydroperoxides. A further kinetic study combining pulse radiolysis with product analysis was devoted to the OH-radical-induced degradation of atrazine which furnished information on the production and decay of the precursors to the dealkylated products, including the atrazine radicals and their corresponding peroxyl radicals, Schiff bases, and superoxide radicals. (orig.)SIGLEAvailable from TIB Hannover: F00B423 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung (BMBF), Bonn (Germany)DEGerman