Kinetics of reactions of technetium. VIII. Reduction of Tc(VII) by ascorbic acid in HC1 solution

Journal Article · Tue Mar 01 04:00:00 EST 1988 · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:6281127

Koltunov, V S; Gomonova, T V; Shapovalov, M P; Abramova, I G

The reduction of Tc(VII) by ascorbic acid in HCl solution proceeds according to the equation 2TcO/sub 4//sup -/ + 3C/sub 6/H/sub 8/O/sub 6/ + 10HCl = 2TcCl/sub 5//sup -/ + 3C/sub 6/H/sub 6/O/sub 6/ + 8H/sub 2/O. The reaction is characterized by an induction period, after the conclusion of which its rate is equal to -d(Tc(VII))/dt = k(Tc(VII)) x (C/sub 6/H/sub 8/O/sub 6/) (H/sup +/)/sup 1.6/, where k = 0.898 + 0.064 liter/sup 2.6//mole/sup 2.6./min at 25/sup 0/C and ..mu.. = 2. The reaction mechanism includes a slow step of interaction of TcO/sub 3//sup +/ ions with C/sub 6/H/sub 8/O/sub 6/ molecules and ascorbate complexes of Tc(IV). The full kinetic equation describing the course of the reaction, including the induction period, is obtained.

• OSTI ID: 6281127
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 29:4; ISSN SVRDA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ASCORBIC ACID
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
EQUATIONS
HALIDES
HALOGEN COMPOUNDS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETIC EQUATIONS
KINETICS
OXIDES
OXYGEN COMPOUNDS
REACTION INTERMEDIATES
REACTION KINETICS
REDOX POTENTIAL
REDUCING AGENTS
REDUCTION
REFRACTORY METAL COMPOUNDS
SPECTROPHOTOMETRY
STOICHIOMETRY
TECHNETIUM CHLORIDES
TECHNETIUM COMPOUNDS
TECHNETIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VALENCE
VITAMINS