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AWWA WQTC65831
- Photodegradation and Dehalogenation of Aqueous Flame Retardants and Plasticizers
- Conference Proceeding by American Water Works Association, 11/01/2007
- Publisher: AWWA
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Organophosphate esters (OPEs) are commonly used as additives in foams, paints, andother industrial applications where plasticizers or flame-retardants are required. Thesemostly water soluble compounds have been detected in wastewaters, surface waters, anddrinking waters across Europe and North America. The aqueous OH-oxidation rate, k<sub>OH</sub>,was empirically determined for four organophosphate esters according to a previouslydeveloped UV-H<sub>2</sub>O<sub>2</sub>-competition-kinetics method, utilizing a bench-scale UV apparatuscontaining low-pressure-Hg lamps, and nitrobenzene as the reference compound. Theefficiency of dehalogenation, with respect to oxidation of a chlorinated OPE in lab-gradewater, was assessed for OH formed from UV-H<sub>2</sub>O<sub>2</sub> and UV-HOCl. The significance ofthe observed rates of OPE oxidation and subsequent dehalogenation are discussed. Includes 12 references, figures.
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