AbstractAbstract
No abstract available
Original Title
Opredelenie konstant skorosti reaktsii disproportsionirovaniya Pusup((5)) i real'nykh okislitel'no-vosstanovitel'nykh potentsialov pary Pusup((6))-Pusup((5)) metodom potentsiostaticheskoj kulonometrii
Source
For English translation see the journal Sov. Radiochem.
Record Type
Journal Article
Journal
Radiokhimiya; v. 17(3); p. 419-425
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AbstractAbstract
[en] Potentiostatic, coulometric, potentiometric, and amperometric methods have been used for determining the rate constants of disproportionation (ksub(d)) of plutonium(5) and neptunium (5) and normal real redox potentials (Esub(0)sup(p)) of the following ion pairs in sulphur-phosphoric-acid media: PuOsub(2)sup(2)sup(+) (PuO2+, Pu4+/Pu3+, NpO22+/NpO2+, NpO22+/Np4+, NpO2+/Np4+, and Fe3+/Fe2+. The regularities have been shown of changing ksub(d) and Esub(o)sup(p) as a function of H2SO4 and H3PO4 concentration. It has been established that for plutonium and neptunium a linear correlation is observed between lg ksub(d) and Esub(o)sup(p) of the ion pairs NpO22+/NpO2+, NpO22/Np4+, NpO2+/Np4+ and PuO22+/PuO2+ in a wide range of their values. The correlation coefficient is close to unity in all cases (no less than 0.96). The results of investigations have made it possible to recommend optimum compositions of background electrolytes for performing continuous amperostatic coulometric titration of Pusup((6)) and Npsup((6)) up to four valent state by electrogenerated ions of iron (2)
Original Title
Issledovaniya okislitel'no-vosstanovitel'nykh reaktsij plutoniya i neptuniya v serno-fosfornokislykh sredakh
Source
Conference on neptunium and plutonium chemistry; Leningrad, USSR; 25 Mar 1975; 12 refs.; 10 figs.; for English translation see the journal Sov. Radiochem.
Record Type
Journal Article
Literature Type
Conference
Journal
Radiokhimiya; v. 18(1); p. 77-88
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AbstractAbstract
No abstract available
Original Title
Opredelenie konstant skorosti reaktsii disproportsionirovaniya Np (5) i real'nykh potentsialov par Np (6)-Np (5), Np (6)-Np(4) i Np (5)-Np (4) v serno-fosfornokislykh sredakh
Source
For English translation see the journal Sov. Radiochem.
Record Type
Journal Article
Journal
Radiokhimiya; v. 17(2); p. 189-195
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AbstractAbstract
No abstract available
Original Title
Struktura akvakompleksa urana (4)
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Record Type
Journal Article
Journal
Zhurnal Neorganicheskoj Khimii; v. 15(5); p. 1332-1335
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[en] Coulometric methods of determining Pu and Np in the products of complex composition containing, in addition to Pu and Np, Cr and Nn have been developed. The methods are based on titration of Pusup((6)) and Npsup((6)) to tetravalent state in H2SO4-H3PO4 with iron (2) ions generated continuously. A new variant of amperometric method has been proposed for determining end-point of titration. The methods of preparing Pusup((6)) and Npsup((6)) solutions have been developed. It has been shown that, upon dissolution of PuO2 and NpO2 by boiling with a mixture of nitric and perchloric acids Pusup((4)) and Npsup((4)) are oxidized quantitatively to Pusup((6)) and Npsup((6)) while Cl2, Crsup((6)) and Mnsup((7,4,3)) in the solution obtained are selectively reduced by CHOOH and CH2(COOH)2. In 6-8 M in terms of H2SO4 solution, ammonium bichromate oxidizes Npsup((4)) to Npsup((6)), Pusup((3)) to Pusup((4)), and Mnsup((2)) to Mnsup((3)). Oxidized Mn and excess of Crsup((6)) are selectively reduced by CHOOH and H2C2O4 in 4M in terms of H2SO4 solution
Original Title
Opredelenie plutoniya i neptuniya v razlichnykh materialakh metodom kulonometricheskogo titrovaniya s amperometricheskoj indikatsiej
Primary Subject
Source
Conference on neptunium and plutonium chemistry; Leningrad, USSR; 25 Mar 1975; 6 tables; 5 figs.; for English translation see the journal Sov. Radiochem.
Record Type
Journal Article
Literature Type
Conference
Journal
Radiokhimiya; v. 18(1); p. 128-136
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[en] A mathematical model of radiative heat exchange in the throats of wide-necked helium cryostats is analyzed. A comparison of the numerical results with known calculated and experimental data shows their good agreement
Primary Subject
Source
Cover-to-cover translation of Inzhenerno-Fizicheskij Zhurnal (Byelorussian SSR).
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Journal Article
Journal
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AbstractAbstract
No abstract available
Original Title
Gelievye kriostaty edinoj serii KG
Source
Short note. For English translation see the journal Instruments and Experimental Techniques (USA).
Record Type
Journal Article
Journal
Pribory i Tekhnika Ehksperimenta; ISSN 0032-8162;
; (no.4); p. 244

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