Pulse radiolytic studies of aqueous Mn(CIO/sub 4/)/sub 2/ solutions
Journal Article
·
· J. Phys. Chem.; (United States)
Using Mn(ClO/sub 4/)/sub 2/, the reactions of Mn/sup 2 +/ with CO/sub 2//sup -/, e/sup -//sub aq/, OH, and O/sub 2//sup -/ were studied at pH 6.7. The following reaction rate constants were measured: k(Mn/sup 2 +/ + CO/sub 2//sup -/) less than 2 x 10/sup 5/ M/sup -1/ s/sup -1/; k(Mn/sup 2 +/ + e/sup -//sub aq/) = (9 +- 2) x 10/sup 6/ M/sup -1/ s/sup -1/ (ionic strength 0.15 to 0.5 M); k(Mn/sup 2 +/ + OH) = (3.4 +- 0.8) x 10/sup 7/ M/sup -1/ s/sup -1/; k(Mn/sup 2 +/ + O/sub 2//sup -/) = (1.1 +- 0.2) x 10/sup 8/ M/sup -1/ s/sup -1/ (0.01 M formate). O/sub 2//sup -/ radical ions react with Mn/sup 2 +/ and produce Mn/sup 3 +/ or MnO/sub 2//sup +/ ions. The reaction was found to be reversible, and an equilibrium constant K = (1.5 +- 0.6) x 10/sup 4/ M/sup -1/ was measured at pH 6.7. Mn/sup 2 +/, however, does not catalyze the dismutation of O/sub 2//sup -/. The disproportionation of Mn(III) (as MnOH/sup 2 +/) and the subsequent nucleation of the product MnO/sub 2/ are reported.
- Research Organization:
- Hebrew Univ., Jerusalem
- OSTI ID:
- 7152549
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 80:17; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
400600* -- Radiation Chemistry
AQUEOUS SOLUTIONS
CATIONS
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE COMPOUNDS
CRYOGENIC FLUIDS
DECOMPOSITION
DISPERSIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FLUIDS
HALOGEN COMPOUNDS
HYDRATION
HYDROXYL RADICALS
IONS
KINETICS
LEPTONS
MANGANESE COMPOUNDS
MANGANESE PERCHLORATES
MIXTURES
NONMETALS
OXYGEN
OXYGEN COMPOUNDS
PERCHLORATES
PULSES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION KINETICS
SOLUTIONS
SOLVATED ELECTRONS
SOLVATION
TRANSITION ELEMENT COMPOUNDS
400600* -- Radiation Chemistry
AQUEOUS SOLUTIONS
CATIONS
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
CHLORINE COMPOUNDS
CRYOGENIC FLUIDS
DECOMPOSITION
DISPERSIONS
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
FLUIDS
HALOGEN COMPOUNDS
HYDRATION
HYDROXYL RADICALS
IONS
KINETICS
LEPTONS
MANGANESE COMPOUNDS
MANGANESE PERCHLORATES
MIXTURES
NONMETALS
OXYGEN
OXYGEN COMPOUNDS
PERCHLORATES
PULSES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION KINETICS
SOLUTIONS
SOLVATED ELECTRONS
SOLVATION
TRANSITION ELEMENT COMPOUNDS