You are here:
LABORATORY INVESTIGATIONS OF INTERACTIONS OF IRRADIATED O-XYLENE/NOX/SO2/AIR MIXTURES WITH AQUEOUS MEDIA CONTAINING SODIUM FLUORIDE, SODIUM TRIFLUOROACETATE, AMMONIUM NITRATE AND HYDROGEN PEROXIDE
Citation:
Edney, E., D. Driscoll, E. Corse, AND F. Blanchard. LABORATORY INVESTIGATIONS OF INTERACTIONS OF IRRADIATED O-XYLENE/NOX/SO2/AIR MIXTURES WITH AQUEOUS MEDIA CONTAINING SODIUM FLUORIDE, SODIUM TRIFLUOROACETATE, AMMONIUM NITRATE AND HYDROGEN PEROXIDE. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-95/274, 1994.
Description:
Laboratory experiments were conducted to investigate interactions between complex air mixtures and aqueous films containing hydrolysis products of hydrochlorofluorocarbon (HCFC) and hydrofluorocarbon (HFC) oxidation products. he experiments consisted of exposing aqueous films containing mixtures of NH4NO3, H2O2 and either NaF or NaCF3COO on stainless steel panels to irradiated o-xylene/NOx/SO2/air mixtures. he complex air mixtures and exposed films were chemically analyzed. liquots of the exposed films were then allowed to evaporate after which the chemical composition of the remaining residual salt was determined. he data were used to determine how the chemical composition of the film influenced (1) the deposition of components of the complex air mixture to aqueous films and (2) the fate of film constituents during evaporation. or small H2O2 loadings the SO2 deposition was limited by the available oxidant. owever, for the higher loadings, the uptake data were consistent with control by gas-phase mass transfer. ffective aqueous film deposition velocities for HCHO and CH3COCHO were 0.37 and 0.367 cms-1, respectively. he evaporative anion loss data suggest that NO-3, NO-2, F-, HCOO- and CF3COO- were lost by evaporation of the corresponding acid. owever, the possibility of other CF3COO- reactions occurring during evaporation could not be eliminated. he laboratory results show that depositions of HCFC and HFC oxidation products to acidic aqueous media that can undergo evaporation may not always serve as permanent sinks.