Abstract
The effect of microwave radiation (MWR) on the decomposition of UO2(NO3)2·6H2O was studied. Determination of [UO 2+2 ] and [NO −3 ], and also of the molar ratio NO −3 : UO 2+2 in various fractions of the decomposition product showed that the mechanism of the UO2(NO3)2·6H2O decomposition under the action of MWR differs from the mechanism of its decomposition under common convection heating. The main precursor of UO3 as product of UO2(NO3)2·6H2O decomposition under the action of MWR is uranyl hydroxonitrate UO2(OH)NO3 formed already in the first minutes of the irradiation. In contrast to the thermolysis under convection heating, UO2(NO3)2 or its hydrates were not detected as intermediates. The mechanism of the UO2(NO3)2·6H2O decomposition under the action of MWR can be presented by the reactions UO2(NO3)2·6H2O → UO2(OH)NO3 + 5H2O + HNO3 and UO2(OH)NO3 → UO3 + HNO3. The solubility of UO2(OH)NO3 in H2O at 20°C was estimated experimentally at 6.83 × 10−2 M.
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Original Russian Text © S.A. Kulyukhin, A.N. Kamenskaya, V.A. Lavrikov, 2009, published in Radiokhimiya, 2009, Vol. 51, No. 3, pp. 228–233.
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Kulyukhin, S.A., Kamenskaya, A.N. & Lavrikov, V.A. Mechanism of UO2(NO3)2·6H2O decomposition under the action of microwave radiation. Radiochemistry 51, 262–268 (2009). https://doi.org/10.1134/S1066362209030084
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DOI: https://doi.org/10.1134/S1066362209030084