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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. Molar extinction coefficients of Np(VI),  ε  T  M  – 1  cm  – 1 , were obtained at various temperatures (297, 313, 334, 352, and 372 K). The values of  ε  T  were found to decrease with increasing temperature and could be described by the equation  ε  T  =− 0.14 T  + 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  /d t  = 2.2 × 10 7  exp [− 65 × 10 3 /( RT )][Np(V)]  t  , where  R ,  T , and [Np(V)]  t   indicate the gas constant, temperature, and Np(V) concentration at time  t , respectively.

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

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