Effects of ionic strength on the kinetics for UO2 oxidation

Hossain, Mohammad Mohsin; Jönsson, Mats

doi:10.1016/j.jnucmat.2007.05.043

Cited by 6 publications

(3 citation statements)

References 12 publications

(15 reference statements)

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“…Recently, the ionic strength effect on the reaction between H 2 O 2 and UO 2 was studied quite extensively [52]. The ionic strength effect on the kinetics of the reaction was studied for solutions containing 0 and 10 mM HCO 3 -.…”

Section: Oxidation Of Uo 2 (S)mentioning

confidence: 99%

Oxidation of UO2(s) in aqueous solution

Roth

Jönsson

2008

Open Chemistry

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Abstract:In this review the kinetics and mechanism of oxidative dissolution of UO 2 (s), mainly under conditions of relevance for the safety assessment of a deep geological repository for spent nuclear fuel, are discussed. Rate constants for the elementary processes involved (oxidation of UO 2 and dissolution of oxidized UO 2 ) are used to calculate the rates of oxidative UO 2 (s) dissolution under various conditions (type of oxidant, oxidant concentration and HCO 3 -/CO 3 2-concentration) for which experimental data are also available. The calculated rates are compared to the corresponding experimental values under the assumption that the experimental numbers reflect the steady-state conditions of the system. The agreement between the calculated rates and the corresponding experimental ones is very good, in particular for the higher rates. In general, the calculated rates are somewhat higher than the experimental numbers. This can be due partly to the use of initial concentrations rather than steady-state concentrations in the calculations. The kinetic data are also used to quantitatively discuss the dynamics of spent nuclear fuel dissolution under deep geological repository conditions. © Versita Warsaw and Springer-Verlag Berlin Heidelberg.

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Section: Oxidation Of Uo 2 (S)mentioning

confidence: 99%

Oxidation of UO2(s) in aqueous solution

Roth

Jönsson

2008

Open Chemistry

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“…A study of the kinetics UO 2 oxidation by H 2 O 2 in aqueous solution containing 10 -200 mM NaCl revealed that, under HCO À 3 free conditions, the H 2 O 2 consumption rate increases with increasing NaCl concentration (i.e. increasing ionic strength) [25] whereas at 10 mM HCO À 3 concentration (i.e. where the kinetics is independent of the dissolution of oxidized UO 2þ 2 [6]), the H 2 O 2 consumption rate was shown to be unaffected by the presence of chloride.…”

Section: Introductionmentioning

confidence: 99%

On the impact of reactive solutes on radiation induced oxidative dissolution of UO2

Roth

Jönsson

2009

Journal of Nuclear Materials

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“…The reactivity of peroxymonocarbonate towards UO 2 is not known but judging from the reported redox properties it should be similar to that of H 2 O 2 [10]. However, very recent studies on the influence of ionic strength on the kinetics for UO 2 oxidation by H 2 O 2 indicate that peroxymonocarbonate is of no significance [11].…”

Section: Introductionmentioning

confidence: 99%