Abstract
Thermochromatographic (TC) experiments aimed to obtain volatile products of thermal oxidation of trace amounts of 237Np were performed. The oxidation products were separated on quartz TC columns. The carrier gas was He, and the reagent, O2 in a concentration of 50 or 1 vol %. The gaseous mixture was dried to a residual water vapor concentration of 10−4%. Three volatile species depositing at 425 ± 25, 245 ± 25, and 60 ± 30°C were formed under the experimental conditions. The product depositing in the first adsorption zone is NpO2; that depositing in the second zone, neptunium trioxide NpO3; and that depositing in the third zone is tentatively identified as the acid HNpO4. The calculated enthalpies of adsorption −ΔH a 0 (kJ mol−1) of the deposited products on quartz are as follows: 167 ± 6 (NpO2), 124 ± 6 (NpO3), and 81 ± 7 (presumably HNpO4).
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