Abstract
Valence stabilization of polyvalent ions in acidic solutions during gamma irradiation is an important issue in nuclear aqueous chemical technology. Radiolysis and self irradiation problems encountered during chemical reprocessing of nuclear fuel or during chemical separation of transuranium elements or fission products are extremely important. Consequently studies on valence stabilization of polyvalent ions in strong gamma irradiation fields are very useful. In our previous publications, the valence stabilization of Fe(II) ions in acidic solutions during continuous gamma irradiation was achieved by using an inorganic compound; such as sodium sulfite, or some organic additives such as aliphatic alcohols, aldehyds or acids prior to irradiation. It was found that the efficiency of valence stabilization depends on the amount and chemical structure of the added compounds. In the present work, valence stabilization of divalent iron during gamma irradiation was studied in presence of some organic additives, belonging to some other classes of organic compounds such as Phenol (aromatic alcohol), Acetone (aliphatic ketone), 4-Aminopyridine (heterocyclic amino compound) and Hydrazine hydrate (aliphatic amino compound) to complement our previous studies. The results showed that valence stabilization of Fe(II) in presence of these compounds depends also on the amount and chemical structure of the additive used. Some interaction mechanisms have been proposed.
Highlights
Valence change of polyvalent ions in aqueous acidic solutions in strong gamma irradiation fields can seriously affect the mechanism of some chemical processes
That valence change occurs as a result of the effect of the primary products formed by water radiolysis [1]-[3]
It has been reported that protective effects occur as a result of the competitive reactions taking place between the chemical additive and the polyvalent metal ions for the oxidizing or reducing species formed by water radiolysis
Summary
Valence change of polyvalent ions in aqueous acidic solutions in strong gamma irradiation fields can seriously affect the mechanism of some chemical processes. It has been reported that protective effects occur as a result of the competitive reactions taking place between the chemical additive and the polyvalent metal ions for the oxidizing or reducing species formed by water radiolysis. The existence of organic additives in Fe(II) acidic solutions, enhances valence stability of the divalent iron ions against oxidation during continuous gamma irradiation. In order to further understand the prevailing mechanisms, Fe(III) ions were used instead of Fe(II) in the irradiated solutions and it was found that Fe(III) ions were first reduced to the divalent state and the formed Fe(II) ions remained protected against oxidation, depending on the type and concentration of the organic additive used [7]. The protective effect occurring due to the presence of additives belonging to different classes of organic compounds namely, Phenol (aromatic alcohol), Acetone (aliphatic ketone), 4-Aminopyridine (aromatic heterocyclic nitrogen compound) and Hydrazine hydrate (aliphatic amine) on divalent iron ions during extended gamma irradiation, has been studied
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