Kinetics of the reduction of vanadium(V) by sodium sulfite in an acidic medium

Journal Article · Sat Jan 01 00:00:00 EST 1983 · Kinet. Catal. (Engl. Transl.); (United States)

OSTI ID:5560366

Khyarsing, I V; Filippov, A P

The kinetics of the reduction of vanadium(V) by sodium sulfite was studied by uv-visible spectrometry at 25/sup 0/C. The acidity of the solutions was controlled by the addition of calculated amounts of hydrochloric, sulfuric acids and sodium hydroxide. The pH of the medium varied from -0.45 to 3. The reagents were mixed, remained thermostated for 20 min; and the optical density vs time was recorded with a Specord uv vis spectrophotometer. Rate curves were measured in the absorption region of vanadium(V) and vanadium(IV). The light absorption followed the Lambert-Berr-Bouguer law. The effective rate constant was calculated from the change in optical density in the region of vanadium(IV) absorption. The most active species appear to be HSO/sub 3//sup -/ and VO/sub 2/SO/sub 4//sup -/. Above pH 3, the reaction is accompanied by a slow increase in optical density over the entire visible spectrum, and after a period of time these solutions deposit a green precipitate which is, apparently a polymeric vanadyl vanadate. 3 figures, 2 tables.

• OSTI ID: 5560366
• Journal Information: Kinet. Catal. (Engl. Transl.); (United States), Vol. 24:2; Other Information: Translated from Kinet. Katal; Vol. 24: No. 2, 302-307(Mar 1983)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMMONIUM COMPOUNDS
ABSORPTION SPECTRA
CHEMICAL REACTIONS
SODIUM COMPOUNDS
SULFITES
VANADATES
REDUCTION
VANADIUM
RECOVERY
AQUEOUS SOLUTIONS
CHEMICAL REACTION KINETICS
CHLORIDES
EXPERIMENTAL DATA
HYDROCHLORIC ACID
HYDROXIDES
MEDIUM TEMPERATURE
OPACITY
PH VALUE
REACTION INTERMEDIATES
STOICHIOMETRY
SULFURIC ACID
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
ALKALI METAL COMPOUNDS
CHLORINE COMPOUNDS
DATA
DISPERSIONS
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
KINETICS
METALS
MIXTURES
NUMERICAL DATA
OPTICAL PROPERTIES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
REACTION KINETICS
SOLUTIONS
SPECTRA
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VANADIUM COMPOUNDS
360101* - Metals & Alloys- Preparation & Fabrication
400201 - Chemical & Physicochemical Properties