Výsledky vyhledávání - "G. V. Koltunov"

Kinetics and mechanism of the plutonium catalysed nitric acid oxidation of U(IV) ions in 30% tributyl phosphate solution

Autor: G. V. Koltunov, O. A. Savilova, G. I. Zhuravleva, M. Bankhead, V. I. Marchenko, Robin J. Taylor, K. N. Dvoeglazov, V. S. Koltunov

Publikováno v: Radiochimica Acta. 95:559-567

The oxidation of U(IV) ions in the diluted solvent phase, 30% TBP/n-dodecane, has been investigated in the presence of plutonium ions, which can act as catalysts for U(IV) oxidation. The reaction was shown to follow the cycle below, with the first an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ca5fd4760837aa4e783225e5df0bab1f
https://doi.org/10.1524/ract.2007.95.10.559

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Tc(VII)-catalyzed oxidation of U(IV) with nitric acid in solution of TBP in n-dodecane

Autor: G. V. Koltunov, Robin J. Taylor, V. S. Koltunov, K. N. Dvoeglazov, V. I. Marchenko

Publikováno v: Radiochemistry. 49:371-375

Oxidation of U(IV) with nitric acid in 30% solution of TBP in n-dodecane is catalyzed by Tc ions; the rate-determining steps are 3U(IV) + 2Tc(VII) → 3U(VI) + 2Tc(IV) and Tc(IV) + Tc(VII) → Tc(V) + Tc(VI). Oxidation of U(IV) is inhibited by the re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0685f8b47518fcf1fd390270783bae8e
https://doi.org/10.1134/s106636220704008x

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Kinetics of Pu(IV) reduction with tert-butylhydrazine

Autor: V. G. Pastushchak, G. V. Koltunov, V. S. Koltunov

Publikováno v: Radiochemistry. 48:348-351

The rate of Pu(IV) reduction with tert-butylhydrazine in an HNO3 solution is described by the equation-d[Pu(IV)]/dt = k[Pu(IV)]2[(CH3)3CN2H4+]/[H+], where k = 69.4 ⊥ 3.0 l mol−1 min−1 at 50°C. The activation energy is E = 122 ⊥ 4 kJ mol−1.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8700b0bb1ee65fc00ad7d250d551b725
https://doi.org/10.1134/s1066362206040060

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Kinetics of Reactions of Np and Pu Ions with Hydrazine Derivatives: XVIII. Reaction between Np(V) and Hydroxyethylhydrazine

Autor: G. V. Koltunov, V. S. Koltunov, S. M. Baranov

Publikováno v: Radiochemistry. 47:168-172

The kinetics of the reaction between Np(VI) and methylhydrazine obeys the equation -d(Np(VI))/dt = k (Np(VI))/(CH/sub 3/N/sub 2/H/sub 4//sup +/)/(H/sup +/), where k = 32.1 +/- 1.8 and 52.7 +/- 1.7 min/sup -5/ at 25/sup 0/C and ionic strength ..mu.. =

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d3e5b1e29972bf35ae2ce069da8ad761
https://doi.org/10.1007/s11137-005-0066-x

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Kinetics of Technetium Reactions: XV. Tc(IV) Oxidation with Persulfate Ions in HClO4 Solution

Autor: V. S. Koltunov, G. V. Koltunov, T. V. Gomonova

Publikováno v: Radiochemistry. 47:163-167

Tc(IV) is oxidized with persulfate ions in HClO4 solution by reactions with both S2O 8 2− ion and product of its thermal decomposition, Caro acid, H2SO5. The reaction rate at 35°C and solution ionic strength µ = 1 is described by the equation d[T

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4e6c0d0aea6e12ae0156903880834f27
https://doi.org/10.1007/s11137-005-0065-y

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Kinetics and Mechanism of Pu(VI) Reduction with Acetaldoxime in Nitric Acid Solution

Autor: E. A. Mezhov, V. S. Koltunov, V. G. Pastushchak, G. V. Koltunov

Publikováno v: Radiochemistry. 47:69-73

Reduction of Pu(VI) to Pu(III) with acetaldoxime (CH3CHNOH) in an HNO3 solution involves three consecutive steps Pu(VI) → Pu(V) → Pu(IV) → Pu(III), and also reproportionation of Pu(IV). Complete kinetics equations of these steps were derived an

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8342cebe802158ebc70a6e0bcc2f3332
https://doi.org/10.1007/s11137-005-0050-5

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Kinetics of Reactions of Np and Pu Ions with Hydrazine Derivatives: XVII. Reaction of Pu(VI) with Hydroxyethylhydrazine

Autor: V. S. Koltunov, V. G. Pastushchak, G. V. Koltunov, E. A. Mezhov

Publikováno v: Radiochemistry. 46:125-130

Reduction of Pu(VI) to Pu(III) with hydroxyethylhydrazine (HOC2H4N2H3) in HNO3 solutions involves the following consecutive steps2: Pu(VI) + HOC2H4N2H4 → Pu(V) + ...; Pu(V) + HOC2H4N2H4+ → Pu(IV) + ...; Pu(V) + Pu(III) → 2Pu(IV); and Pu(IV) + H

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::764a16477c65f0f195eb207dbe0380c0
https://doi.org/10.1023/b:rach.0000024936.87231.c0

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The kinetics and mechanism of the reduction of neptunium (VI) ions by uranium (IV) ions in nitric acid

Autor: G. V. Koltunov, V. I. Marchenko, K. N. Dvoeglazov, Robin J. Taylor, Eduard Andreevich Mezhov, V. S. Koltunov, G. I. Zhuravleva

Publikováno v: Scopus-Elsevier

SummaryThe rapid reduction of NpO22+ions to NpO2+by U(IV) ions in an aqueous nitric acid solution has been studied and, in many ways, is similar in character to the same reaction in HClO4. The major difference is that in HNO3the reaction proceedsviat

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::02a24b61632c710d3db9ccf3f91307e8
https://doi.org/10.1524/ract.2002.90.5_2002.259

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[Untitled]

Autor: V. S. Koltunov, G. V. Koltunov, E. V. Renard, A. V. Khaperskaya

Publikováno v: Radiochemistry. 43:271-275

The rate of the reaction 2Rh(H2O)63+ + XeF2 = 2Rh(OH)3+ + Xe + 2HF + 4H+ + 6H2O is described by the second-order equation -d[Rh(III)]/dt = k1[Rh(III)][XeF2], where k1 = 15.4±0.8 l mol-1 min-1 at 17.8°C and the solution ionic strength μ = 2. The ac

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d8be41f3f70260707504c773dff9a04c
https://doi.org/10.1023/a:1012860525170

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