title: The ROH,UV concept to characterize and the model uv/H202 process in natural waters.
abstract: A new concept is introduced to characterize and model the UV/H2O2 advanced oxidation process (AOP) in water. Similarto the Rct concept used to describe OH radical exposure per ozone dose, the ROH,UV concept is defined as the experimentally determined *OH radical exposure per UV fluence. ROH,UV was determined by examining the destruction of a probe compound, para-chlorobenzoic acid in four different waters: DI water and three natural waters. ROH,UV was found to be affected greatly by water quality, specifically background *OH radical scavenging, which competed forthe formed *OH radical with the probe compound, and background UV absorbance, which screened UV irradiation from the hydrogen peroxide. The ROH,UV values determined in the experiments using low-pressure Hg lamp were greater than those for the medium-pressure Hg lamp . Finally, the ROH,UV concept was utilized to calculate an overall scavenging factor for each water matrix, and this was successfully utilized in conjunction with the steady-state *OH radical model to improve the prediction of the oxidation of endocrine-disrupting compounds 17-alpha-ethinyl estradiol and 17-beta-estradiol in the natural waters.
authors: Department of Civil and Environmental Engineering, Duke University, Box 90287, Durham, North Carolina 27708-0287, USA.
authors: Erik J
authors: EJ
authors: Rosenfeld
authors: Karl G
authors: KG
authors: Linden
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000379:methods*; D002723:Chlorobenzoates / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid; D004958:Estradiol / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D017665:Hydroxyl Radical / Q000032:analysis*; D010084:Oxidation-Reduction / Q000528:radiation effects; D014466:Ultraviolet Rays; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D002723:Chlorobenzoates; D014874:Water Pollutants, Chemical; D014867:Water; D017665:Hydroxyl Radical; D004958:Estradiol; D006861:Hydrogen Peroxide; C040768:4-chlorobenzoic acid