Radiation chemical behavior of Rh(III) in HClO{sub 4} and HNO{sub 3}

Journal Article · Mon May 01 04:00:00 EDT 1995 · Radiochemistry

OSTI ID:136036

Vladimirova, M V; Khalkina, E V

The radiation chemical behavior of Rh is very interesting since Rh accumulates in irradiated U but has not been reported in the literature. Scattered data do exist for the radiation chemical behavior of Rh(III) in weakly acidic and alkaline solutions. Pulsed radiolysis was used to investigate the formation of unstable oxidation states of Rh during reduction and oxidation of Rh(III) in neutral solutions. The rate constant of the reaction Rh(III) + e{sub aq}{sup {minus}} was found to be 6{center_dot}10{sup 10} liter/mole{center_dot}sec. The radiation chemical behavior of Rh(III) toward {gamma}-radiolysis in neutral, weakly acidic (up to 0.1 N), and alkaline solutions was examined. In neutral solutions of [Rh(NH{sub 3}){sub 5}Cl]Cl{sub 2} and RhCl{sub 3}, metallic Rh is formed. The degree of reduction is {approximately} 1%. In neutral and weakly acidic solutions of Rh(NO{sub 3}){sub 3}, Rh{sub 2}O{sub 3}{center_dot}xH{sub 2}O is formed. Irradiation of Rh(ClO{sub 4}){sub 3} solutions produces no reduction. The radiation chemical behavior of Rh(III) in HClO{sub 4} and HNO{sub 3} solutions at concentrations > 1 M is studied in the present work.

• OSTI ID: 136036
• Journal Information: Radiochemistry, Journal Name: Radiochemistry Journal Issue: 5 Vol. 36; ISSN RDIOEO; ISSN 1066-3622
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
NITRIC ACID
PERCHLORIC ACID
RADIOLYSIS
RHODIUM