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Spectroscopic study of Np(V) oxidation to Np(VI) in 3 mol/dm$$^{3}$$ nitric acid at elevated temperatures

Ban, Yasutoshi  ; Hakamatsuka, Yasuyuki; Tsutsui, Nao  ; Urabe, Shunichi; Hagiya, Hiromichi; Matsumura, Tatsuro  

Optical absorption spectra of Np in 3 mol/dm$$^{3}$$ nitric acid at elevated temperatures were measured using an optical glass cell with a water jacket having a light path of 1 cm, and molar extinction coefficients of Np(VI), $$varepsilon$$$$_{T}$$, were obtained at various temperature. The values of $$varepsilon$$$$_{T}$$ was found to decrease with increasing the temperature, and could be described by the equation $$varepsilon$$$$_{T}$$ = -0.14${it T}$+85.5, where ${it T}$ is the temperature. Oxidation of Np(V) to Np(VI) in 3 mol/dm$$^{3}$$ nitric acid at elevated temperatures was observed using the optical glass cell. Oxidation of Np(V) proceeded as pseudo-first order with respect to Np(V) concentration. The rate equation in the temperature range of 336-362 K was obtained as follows: -d[Np(V)]$$_{t}$$/dt = 2.2$$times$$10$$^{7}$$ exp[-65$$times$$10$$^{3}$$/(${it RT}$)][Np(V)]$$_{t}$$, where ${it R}$ and [Np(V)]$$_{t}$$ indicate the gas constant and Np(V) concentration at time ${it t}$, respectively.

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Category:Chemistry, Inorganic & Nuclear

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