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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Ed. by Qaim, Syed M.

12 Issues per year


IMPACT FACTOR 2016: 1.271
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Source Normalized Impact per Paper (SNIP) 2016: 0.761

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2193-3405
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Volume 102, Issue 9 (Sep 2014)

Issues

Spectroscopic study of Np(V) oxidation to Np(VI) in 3 mol/dm3 nitric acid at elevated temperatures

Yasutoshi Ban
  • Corresponding author
  • Japan Atomic Energy Agency, Research Group for Aqueous Separation Process Chemistry, Nuclear Science and Engineering Directorate, Shirane 2-4, Tokai, Ibaraki, 319-1195, Japan
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/ Yasuyuki Hakamatsuka
  • Japan Atomic Energy Agency, Research Group for Aqueous Separation Process Chemistry, Nuclear Science and Engineering Directorate, Shirane 2-4, Tokai, Ibaraki, 319-1195, Japan
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/ Nao Tsutsui
  • Japan Atomic Energy Agency, Research Group for Aqueous Separation Process Chemistry, Nuclear Science and Engineering Directorate, Shirane 2-4, Tokai, Ibaraki, 319-1195, Japan
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/ Shunichi Urabe
  • Japan Atomic Energy Agency, Research Group for Aqueous Separation Process Chemistry, Nuclear Science and Engineering Directorate, Shirane 2-4, Tokai, Ibaraki, 319-1195, Japan
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  • De Gruyter OnlineGoogle Scholar
/ Hiromichi Hagiya
  • Japan Atomic Energy Agency, Research Group for Aqueous Separation Process Chemistry, Nuclear Science and Engineering Directorate, Shirane 2-4, Tokai, Ibaraki, 319-1195, Japan
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/ Tatsuro Matsumura
  • Japan Atomic Energy Agency, Research Group for Aqueous Separation Process Chemistry, Nuclear Science and Engineering Directorate, Shirane 2-4, Tokai, Ibaraki, 319-1195, Japan
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Published Online: 2014-04-04 | DOI: https://doi.org/10.1515/ract-2013-2193

Abstract

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 M1 cm1, 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.

Keywords: Np(V); Np(VI); Oxidation kinetics; Absorption spectrum

About the article

Accepted: 2013-02-24

Received: 2013-10-04

Published Online: 2014-04-04

Published in Print: 2014-09-28


Citation Information: Radiochimica Acta, ISSN (Online) 2193-3405, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1515/ract-2013-2193.

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