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RECORD NUMBER: 335 OF 391

OLS Field Name OLS Field Data
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
Holdings
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Status
NTIS  PB92-179837 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 08/22/1992
Collation 10p
Abstract
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.