International Journal for chemical aspects of nuclear science and technology
Ed. by Qaim, Syed M.
12 Issues per year
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Spectroscopic study of Np(V) oxidation to Np(VI) in 3 mol/dm3 nitric acid at elevated temperatures
Optical absorption spectra of Np in 3 mol/dm3 nitric acid at elevated temperatures were measured using an optical glass cell with a water jacket having a light path of 1 cm. Molar extinction coefficients of Np(VI), εT M–1 cm–1, were obtained at various temperatures (297, 313, 334, 352, and 372 K). The values of εT were found to decrease with increasing temperature and could be described by the equation εT =− 0.14T + 85.5, where T is the temperature. Oxidation of Np(V) to Np(VI) in 3 M nitric acid at elevated temperatures (336, 342, 354, and 362 K) was observed using the optical glass cell. Oxidation of Np(V) was promoted by increasing the temperature and proceeded as a pseudo-first order reaction 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 × 107 exp [− 65 × 103/(RT)][Np(V)]t, where R, T, and [Np(V)]t indicate the gas constant, temperature, and Np(V) concentration at time t, respectively.
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