Abstract
The stoichiometry of the Np(VI) + DTPA reaction in a 0.1 M HClO4 solution (T = 25°C) was studied by spectrophotometry. With Np(VI) in excess, 1 mol of DTPA reduces 5 mol of Np(VI) to Np(V). In 0.09–0.98 M HClO4 solutions (the ionic strength of 1.0 was supported by adding LiClO4) containing 3–20 mM DTPA at 20–45°C, Np(VI) is consumed in accordance with a first-order rate law. The reaction order is 1 with respect to DTPA and −1.5 with respect to H+ ions. The activated complex is formed with the loss of one or two H+ ions. The activation energy is 85.0 ± 4.5 kJ mol−1.
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Shilov, V.P., Stepanova, E.S., and Krot, N.N., Radiokhimiya, 1979, vol. 21, no. 4, pp. 602–607.
Shilov, V.P. and Fedoseev, A.M., Radiochemistry, 2015, vol. 57, no. 3, pp. 255–258.
Martell, A.E. and Smith, R.M., Critical Stability Constants, vol. 1: Amino Acids, New York: Plenum, 1972.
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Original Russian Text © V.P. Shilov, A.M. Fedoseev, 2015, published in Radiokhimiya, 2015, Vol. 57, No. 4, pp. 352–354.
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Shilov, V.P., Fedoseev, A.M. Reduction of Np(VI) with diethylenetriaminepentaacetic acid in HClO4 solutions. Radiochemistry 57, 414–416 (2015). https://doi.org/10.1134/S106636221504013X
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DOI: https://doi.org/10.1134/S106636221504013X