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1.
The stability of Np(VI) in 5–200 mM iminodiacetic acid (H2IDA) solutions at 23.5–55°С was studied by spectrophotometry. In a solution with pH 2 and excess Np(VI), 1 mol of H2IDA reduces 2 mol of Np(VI) to Np(V). In 1 and 0.5 M HClO4 solutions containing 200 mM H2IDA and 1 mM Np(VI), no more than 36 and 65% of Np(VI), respectively, is reduced at 44.5°С. Complete reduction of Np(VI) is observed in solutions containing 0.2 M HClO4 and less. In the examined ranges of H2IDA concentrations and temperatures, Np(VI) is consumed in accordance with the first-order rate law. The reduction mechanism involves formation of a Np(VI) iminodiacetate complex, which is followed by intramolecular charge transfer. The generated radical reduces Np(VI). The activation energy is 107 ± 3 kJ mol–1. 相似文献
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Published data on the stability of Pu(VI) and Pu(V) in solutions of mineral and organic acids and their salts are analyzed.
The hypothesis that Pu(VI) in acid solutions disappears owing to the disproportionation to Pu(VII) and Pu(V) cannot be accepted
because of high redox potential of the Pu(VII)/(VI) couple. Plutonium( VI) is reduced owing to radiation-chemical reactions
induced by its α-radiation and to the formation of a dimer (so-called excimer) by an excited Pu(VI) ion with an unexcited
Pu(VI) ion, which rapidly decomposes to Pu(V) and H2O2. Plutonium(V) disappears owing to disproportionation and radiation-chemical processes. 相似文献
4.
Precipitation of Am(III) and REE peroxides from alkaline-citrate solutions was studied spectrophotometrically. Hydrogen peroxide (0.25–0.4 M) quantitatively precipitates Am(III) and Nd(III) ions from a solution containing 0.1 M NaOH and 0.2–0.4 M citrate. After H2O2 decomposition, the precipitates formed are dissolved in the mother liquor. At lower alkali concentration, 4f and 5f metal ions are precipitated incompletely. In the systems studied, Am and Nd form citrate and hydroxo-citrate complexes in a solution and peroxides in the solid phase.Translated from Radiokhimiya, Vol. 46, No. 6, 2004, pp. 524–526.Original Russian Text Copyright © 2004 by Gogolev, Nikonov, Tananaev, Myasoedov. 相似文献
5.
Oxidation of Np(V) to Np(VI) with xenon trioxide in a 0.5–1.4 M HClO4 solution was studied by spectrophotometry. The reaction rate is described by the equation–d[Np(V)]/dt = k[Np(V)][XeO3], where k = 4.6 × 10–3 L mol–1 s–1 in 1 M HClO4 at 92°С. The activation energy is close to 92 kJ mol–1. The activated complex is formed in contact of NpO 2 + and ХеО3 without participation of Н+ ions. The activated complex transforms into NpO 2 2+ and the products: ОН, Хе, and О2. The ОН radical oxidizes Np(V). Admixtures of Со2+ and especially Fe3+ accelerate the Np(V) oxidation. 相似文献
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During ozonation of Pu(VI) alkaline solutions, the highest oxidation state of Pu is formed in an oscillatory reaction. This plutonium species is reduced with Pu(VI) or Fe(III). Ferrate ion is also reduced with Pu(VI). It was assumed that in alkali solution plutonium is partially oxidized with ozone to Pu(VIII). 相似文献
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Numerical 3D model of viscous turbulent flow in one stage gas turbine and its experimental validation 总被引:1,自引:0,他引:1
The paper describes 3D numerical Reynolds Averaged Navier-Stokes (RANS) model and approximate sector approach for viscous turbulent flow through flow path of one stage axial supercharge gas turbine of marine diesel engine. Computational data are tested by comparison with experimental data. The back step flow path opening and tip clearance jet are taken into account. This approach could be applied for variety of turbine theory and design tasks: for offer optimal design in order to minimize kinetic energy stage losses; for solution of partial supply problem; for analysis of flow pattern in near extraction stages; for estimation of rotational frequency variable forces on blades; for sector vane adjustment (with thin leading edges mainly), for direct flow modeling in the turbine etc. The development of this work could be seen in the direction of unsteady stage model application. 相似文献