Record Display for the EPA National Library Catalog


Main Title Spectroscopic Study of Surface Redox Reactions With Manganese Oxides.
Author Risser, J. A. ; Bailey., G. W. ;
CORP Author Environmental Research Lab., Athens, GA.
Publisher c1992
Year Published 1992
Report Number EPA/600/J-92/157;
Stock Number PB92-179837
Additional Subjects Surface chemistry ; Oxidation reduction reactions ; Environmental surveys ; Manganese oxides ; Spectrum analysis ; Natural emissions ; Organic matter ; Minerals ; Soil surveys ; Chemical spills ; Visible spectroscopy ; Solid wastes ; Chemical reactions ; Path of pollutants ; Sediments ; Ultraviolet spectroscopy ; Reprints ; Chemical reaction mechanisms
Library Call Number Additional Info Location Last
NTIS  PB92-179837 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 10p
Redox reactions involving soil minerals and materials are important processes in environmental chemistry, but unfortunately they only have been characterized in the solution phase. The lack of a suitable method has prevented investigations of the mineral surface component of redox reactions. The authors present a model system which ultraviolet-visible spectroscopy is employed to observe a surface redox reaction. A synthetic MnOx is reacted with Cr(III), resulting in Cr oxidation to the hexavalent state and the reduction of the MnOx mineral. A scattered transmission accessory allowed the authors to observe spectroscopically both the appearance of Cr(VI) and the attenuation of MnOx in a suspension. Loss of absorbance intensity by MnOx suspensions may be useful as a general method to follow redox reactions as a function of the solid phase rather than relative to a specific reactant. This spectroscopic approach provides the capability to monitor in situ reactions of solid-phase components and is useful for examining transformations of metallic and organic wastes and naturally occurring materials in the environment.