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  • 1
    Electronic Resource
    Electronic Resource
    Conductometric studies on the quantitative precipitation of lanthanum, praseodymium, and neodymium as normal tungstate (1965)
    Springer
    Microchimica acta 53 (1965), S. 1105-1109 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Konduktometrische Bestimmungen der Nitrate des La, Pr und Nd mit Natriumwolframat bei 27 ±0,5° C wurden ausgearbeitet. Die Knickpunkte sind scharf und entsprechen stöchiometrisch der Bildung von R2(WO4)3 (R = La, Pr, Nd). Die Resultate sind auch bei geringen Konzentrationen der seltenen Erden ausgezeichnet. Die Wirkung von Äthanolzusatz wurde untersucht. Das Verfahren bietet eine günstige Möglichkeit zur genauen Mikrobestimmung seltener Erden.
    Abstract: Résumé On a effectué les titrages conductimétriques des nitrates de La, Pr et Nd par le tungstate de sodium à 27 ±0,5°C. Les brisures sont nettes et stoechiométriques et elles correspondent à la formation de R2(WO4)3, (R = La, Pr, Nd). Les résultats sont excellents même pour les faibles concentrations en terres rares. On a aussi étudié l'influence de l'éthanol. Le procédé représente une méthode commode et précise pour le microdosage des terres rares.
    Notes: Summary Conductometric titrations of La, Pr, and Nd nitrates have been carried out with sodium tungstate at 27 ±0.5° C. Breaks are sharp and stoicheiometric and correspond to the formation of R2(WO4)3 (R = La, Pr, Nd). The results are excellent even at low concentrations of the rare earths. The effect of ethanol has also been studied. The procedure offers a convenient and accurate method for the micro-determination of rare earths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01219304
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  • 2
    Electronic Resource
    Electronic Resource
    Conductometric study on the quantitative precipitation of samarium (III) as normal tungstate (1965)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 209 (1965), S. 394-397 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Konduktometrische Titrationen von Samariumnitrat mit Natriumwolframat wurden in 30% iger äthanolischer Lösung bei 25°±0,5° C durchgeführt. Bei direkten sowie auch bei umgekehrten Titrationen wurden scharfe Endpunkte erhalten. Das beschriebene Verfahren wird als einfache Methode zur Samarium- oder Wolframbestimmung empfohlen.
    Notes: Summary Conductometric titrations of samarium nitrate with sodium tungstate were carried out with 30% ethanol concentration at 25° ± 0.5° C. The breaks were sharp in both the direct and reverse titrations. The present method is an easy titrimetric procedure for the micro-determination of samarium as well as tungstate ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00520597
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  • 3
    Electronic Resource
    Electronic Resource
    Some studies on the extraction of actinides with crown-ethers (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 108 (1987), S. 89-98 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Crown-ethers extract uranium/VI/, neptunium/IV/ and americium/III/ into MIBK from aqueous thiocyanate solutions. The synergic extraction of U/VI/with crown-ethers and HTTA is also possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02164694
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  • 4
    Electronic Resource
    Electronic Resource
    Some studies on synergic extraction of mixed ligand species of uranium(VI) (1988)
    Springer
    Journal of radioanalytical and nuclear chemistry 121 (1988), S. 149-159 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The extraction of U(VI) by mixtures of HTTA and TBP from aqueous thiocyanate medium has been studied. From the data obtained it was observed that the predominant uranium species extracted, causing synergic enhancement in the extraction of U(VI), is UO2(SCN)TTA · 2TBP when benzene and cyclohexane are used as diluents, and that at a very low concentration of TBP the contribution of additional species, viz. UO2(TTA)2 · TBP becomes significant. With chloroform as diluent, however, both of these species are contributing to the synergic enhancement. The extraction of a quaternary uranium species, UO2(SCN)TTA · 2TBP, involving the participation of the aqueous anion is thus established. Equilibrium constants for the various extraction equilibria involved are calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041456
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of mixed solvent media on the sorption and separation of uranium and plutonium on macroporous resins (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 223 (1997), S. 193-198 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Ion-exchange studies on uranium and plutonium using macroporous (MP) anion-exchange resins from an aqueous-organic solvent mixed media were carried out to develop a separation method. Out of the several water miscible organic solvents tried methanol and acetone were found to be best suited. Distribution data were obtained for U(VI) and Pu(IV) using three macroporous resins under various parameters. Based on these data, separation factors for Pu/U were calculated. Column experiments using Tulsion A-27(MP) were also carried out. The method has the advantage of loading plutonium from as low as 1M nitric acid in the presence of methanol or acetone and could be used satisfactorily for its recovery from solutions containing plutonium and uranium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02223383
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  • 6
    Electronic Resource
    Electronic Resource
    Extraction of U(VI) by phosphonic acid in the presence of neutral donors (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 200 (1995), S. 1-8 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Extraction of U(VI) by mixtures of 2-ethylhexyl 2-ethylhexylphosphonic acid (PC88A) and TOPO in cyclohexane and xylene from aqueous sulfuric acid medium has been investigated. Synergism was observed and the species responsible was identified as UO2H2Y4.TOPO. From the data equilibrium constants for the various reaction equilibria at different temperatures and the thermodynamic parameters were calculated. Antagonism was observed when alkylamide or TBP was used as the neutral donor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02164815
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  • 7
    Electronic Resource
    Electronic Resource
    Concentration with Selective Acid Removal from Americium Solutions Using Ion Exchange Membranes (2000)
    Springer
    Journal of radioanalytical and nuclear chemistry 243 (2000), S. 697-700 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Donnan dialysis and diffusion dialysis techniques are investigated for deacidification and possible concentration of actinide bearing acidic streams. Cation and anion exchange membranes are used in a two compartment dialysis cell to selectively remove acid from americium solutions. Acid concentrations, as high as 8.0M HNO3 are used and the stability of membranes are ascertained. Possibility of simultaneous deacidification and concentration of acidic americium solutions are indicated by combining simple osmosis with diffusion dialysis. All the experiments are carried out under non stirring conditions at room temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010622303809
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  • 8
    Electronic Resource
    Electronic Resource
    Extraction of uranium and plutonium from oxalate bearing solutions using phosphonic acid: Solvent extraction, extraction chromatography and infrared studies (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 240 (1999), S. 631-635 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Solvent extraction and extraction chromatography studies of uranium and plutonium from oxalate supernatant solutions were carried out using 2-ethyl hexyl-2-ethyl hexyl phosphonic acid (PC88A). Based on the distribution data, it was inferred that both the uranium and plutonium could be recovered satisfactorily from such a solution. These studies were found to be useful in optimising the appropriate concentration of PC88A, HNO3, oxalic acid and temperature to recover more than 90% of plutonium from the large volumes of oxalate bearing waste solutions. Spectral characteristics of the extractant and its complexing behavior with U(VI) was also studied using IR & FTIR.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02349424
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  • 9
    Electronic Resource
    Electronic Resource
    Reaction of Tungsten Pentabromide with Primary Amines (1965)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 339 (1965), S. 220-224 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden die Umsetzungsprodukte des Wolfram(V)-bromids mit primären Aminen untersucht. Eine Molekel WBr5 addiert 5 Molekeln eines Monoamins bzw. 2,5 Molekeln Diamin. Aus dem IR-Spektrum eines Monoaminkomplexes wird seine wahrscheinliche Struktur hergeleitet.
    Notes: Amino derivatives of tungsten(V) bromide with primary amines have been prepared and their properties studied. It is found that one molecule of WBr5 combines with 5 molecules of a monoamine and 2.5 molecules of a diamine. An infra-red spectrum of a monoamine complex has been taken and a probale structure suggested.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19653390312
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