Pulse radiolysis study of aqueous nitric acid solutions: formation mechanism, yield, and reactivity of NO3 radical

Katsumura, Yousuke; Jiang, Peiyun; Nagaishi, Ryuji; Oishi, Takeshi; Ishigure, Kenkichi; Yoshida, Yuzo

doi:10.1021/j100164a050

Cited by 131 publications

(101 citation statements)

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“…The absorption spectrum produced has been found to be similar to that known for the nitrate radical (NO 3 Á ) [14]. This suggests masking or absence of absorption of DHOA transients produced with NO 3 Á in the 350-700 nm region.…”

Section: Resultssupporting

confidence: 62%

Reactions of N,N-dihexyloctanamide with nitrate and dodecane radicals: a pulse radiolysis study

et al. 2010

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Recently, completely incinerable N,N-dihexyloctanamide (DHOA) has been identified as a promising alternative to tri-n-butyl phosphate for the reprocessing of spent nuclear fuels. The present work deals with the pulsed radiolytic investigation on the reactions of DHOA with the radicals produced in the radiolysis of nitric acid and dodecane medium. The rate constants of the reactions of DHOA with solvated electron, nitrate radical and dodecane radicals have been measured and the transients have been characterized. In addition, the reactions of DHOA transients have also been studied.

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Section: Resultssupporting

confidence: 62%

Reactions of N,N-dihexyloctanamide with nitrate and dodecane radicals: a pulse radiolysis study

et al. 2010

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“…Finally, in concentrated solution of nitric acid (42 mol L À 1 ), there is a fast reaction between HNO 3 and 1OH radical, k ¼1.4 Â 10 8 mol À 1 L s À 1 (Katsumura et al, 1991). However, difference in variation of G(H 2 O 2 ) between the NaNO 3 solutions and the HNO 3 concentrated solutions (42 mol L À 1 ) in N 2 H 5 þ (25 mmol L À 1 ) was not observed (Fig.…”

Section: G(h 2 O 2 ) Determinationmentioning

confidence: 99%

“…Direct radiolysis mechanism implies two supplementary reactions (Katsumura et al, 1991;Mahlman, 1963):…”

Section: Introductionmentioning

confidence: 99%

Alpha radiolysis of nitric acid and sodium nitrate with 4He2+ beam of 13.5MeV energy

Garaix

Venault

Costagliola

et al. 2015

Radiation Physics and Chemistry

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“…Preliminary, it is vital to understand the radiolysis effects on the diluents because it is prevalent in the literature that radiation damage mainly affects the diluents and, indirectly, the extractants [1]. With this regard, in the last decades a great deal of effort has been devoted to understand the radiolysis mechanism of nitric acid, in terms of possible by-products identifi cation and of formation yields evaluation [14][15][16][17], so as to assess their impact on the actinides chemistry [7,18,19]. Moreover, the composite system concentrated HNO 3 -organic diluent was studied with particular attention to degradation products impact on PUREX process safety [8][9][10].…”

Section: Physico Chemical Properties Of Irradiated I-sanex Diluentsmentioning

confidence: 99%

“…In fact, this anion reacts with water by-products leading to the formation of nitrous anion [16,17], which plays a critical role in the redox chemistry of actinides, and thus on the effi ciency of the separation process [12,22]. Since nitrous anion immediately decomposes in acidic solutions, nitrate ion concentration was monitored [16].…”

Section: Spectroscopic Studymentioning

confidence: 99%

Physico chemical properties of irradiated i-SANEX diluents

et al. 2015

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Abstract. The development of effective processes to recover minor actinides from spent nuclear fuel cannot leave out of consideration the evaluation of the impact of ionizing radiations on safety, fl uid dynamics and extraction effi ciency. It is common knowledge from the literature that radiation damage mainly affects the diluents and, indirectly, the extractants [1], but a lack of knowledge remains regarding the radiolytic behavior of innovative selective actinide extraction (i-SANEX) diluents [2,3]. As natural prosecution of the work already performed on diluted nitric acid solutions [4], 0.44 M nitric acid solutions were irradiated in contact with a mixture of kerosene + 5 vol.% 1-octanol by a Co-60 source at 2.5 kGy/h dose rate and up to 100 kGy absorbed dose, conditions of interest for the future industrial facility. Density, viscosity, acidity, nitrate anion concentration and phase transfers were systematically measured before and after -irradiation. This was performed because radiation-induced modifi cations of these parameters may induce alterations of both the fl uid dynamics and the separation performances of the extracting system. The results suggest that the fl uid-dynamics of the system should be unaltered. In fact, only slight alterations of the organic phase viscosity and of the aqueous phase acidity were measured after irradiation, suggesting the occurrence of limited phase transfers and of diluent by-products formation.

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Pulse radiolysis study of aqueous nitric acid solutions: formation mechanism, yield, and reactivity of NO3 radical

Cited by 131 publications

References 0 publications

Reactions of N,N-dihexyloctanamide with nitrate and dodecane radicals: a pulse radiolysis study

Reactions of N,N-dihexyloctanamide with nitrate and dodecane radicals: a pulse radiolysis study

Alpha radiolysis of nitric acid and sodium nitrate with 4He2+ beam of 13.5MeV energy

Physico chemical properties of irradiated i-SANEX diluents

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