Étude quantitative d'équilibres chimiques en solution dans les sels fondus par spectrophotométrie d'absorption: Application au neptunium |
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Authors: | R Lysy G Landresse G Duyckaerts |
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Institution: | Institut de Radiochimie, Université de Liège au Sart Tilman, B-4000 LiègeBelgique |
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Abstract: | The following reactions: NpO2++4 HCl ? Np4+ + 2 H2O + Cl2 + 3Cl- NpO2++ Cl2 ? NpO22+ +Cl- 2HCl+O2- ? H2O +Cl- have been examined quantitatively. The reactions were studied in fused LiCl-KCl sparged with gas mixtures of definite compositions. The concentrations of the diffrent neptunium species were measured by absorption spectrophotometry. The values of respective equilibrium constants are: K = (9.3±0.4)· 10-6 atm(-); K1 = (2.3±0.1)·10-2 atm(-); k = 103.8 1 mol-1 atm-1 The standard potential of the system NpO22+ / NpO2+ was determinedto be E0 = 0.220 V (vs.standard chlorine electrode). |
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