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1.
Uran (VI)     
Ohne Zusammenfassung  相似文献   

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Uran(VI)     
Ohne Zusammenfassung  相似文献   

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Zusammenfassung Eine extraktionschromatographische Trennung der Ionen Plutonium(III), Uran(IV) und Uran(VI) voneinander wird beschrieben. Tri-n-butylphosphat (TBP) auf einem Trägermaterial aus Polytrifluoromonochloroäthylen wurde als stationäre und Salpetersäure/Hydrazin als mobile Phase verwendet. Die Stabilität des Uran(IV), des Plutonium(III) und der Kolonne unter den Bedingungen der Trennung, der Einfluß der Salpetersäurekonzentration und der Elutionsgeschwindigkeit auf die Effektivität der Trennung, sowie das Verhalten anderer Lösungsbestandteile wurden untersucht. Über das extraktionschromatographische Verhalten des Uran(IV) wird erstmals berichtet. Die wenigen zur Ausführung der Trennung notwendigen Handgriffe sind einfach, was für das Arbeiten in Handschuhkästen von Vorteil ist.
Extraction-chromatographic separation of plutonium(III), uranium(IV) and uranium(VI)
Summary An extraction-chromatographic separation of the ions plutonium(III), uranium(IV) and uranium(VI) from each other is described. Tri-n-butyl phosphate (TBP) on a carrier material made from polytrifluorochloroethylene was employed as the stationary phase while nitric acid/hydrazine served as the mobile phase. The stability of uranium(IV), of the plutonium(III) and the column under the conditions of the separation were studied, as well as the influence of the acid concentration and the elution rate, on the effectiveness of the separation, and also the behavior of other constituents of the solution. The extraction-chromatographic behavior of uranium(IV) is reported here for the first time.— The few manipulations necessary for the accomplishment of the separation are simple, which constitutes an advantage for the working in the glove box.


Einige Experimente wurden währed eines Aufenthaltes bei der Firma Eurochemic in Mol/Belgien ausgeführt.  相似文献   

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Arylvanadium (III) Compounds. VI. Preparation and Properties of Lithium Trimesityl organyl Vanadates Trimesityl vanadium reacts with LiR (R = Ph, o-Tol, Dmop, CH3, CPh3) forming complexes Li(thf)4 VMes3R. With Li2C6H4 and Li2C2 the compounds Li2(thf) 8 V(μ-C6H4)Mes6 and Li2(thf)8V(μ-C2)Mes6 are obtained. All compounds are characterized by their thermal, magnetical, and spectral properties.  相似文献   

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Inhaltsübersicht. Mittels 205Tl-Breitlinien- und hochauflösender 1H-NMR wurden Tl(I)-sowie Organothallium(III)-Verbindungen untersueht und 205Tl- und 1H-chemische Verschiebungen sowie 205Tl-1H-Kopplungskonstanten ermittelt. Die NMR-Parameter dor Tl(I)-Verbindungen wurden mit Literaturwerten verglichen. Die paramagnetischen 205Tl-Verschiebungen von Verbindungen des Type R2TlX (R = Me, Et. n-Pr, Ph; X = NO3, F, Br, J) werden in Bezug auf Substituenten., Losungsmittel- und Konzentrationseinflüsse diskutiert. Auf der Basis eines 0.3 molaren wäßrigen TINO3-Primärstandards werden die 205Tl-Verschiebungen in einer einheitlichen Verschiebungsskala geordnet und nach bindungstheoretischen Gesichtspunkten verglichen. 205Tl-N.M.R.-Spectroscopical Studies on Thallium(I) and Organothallium(III) Compounds Abstract. Tl(I) and organothallium(III) compounds are investigated by means of 205Tl wide line and high resolution 1H-n.m.r. and 1H chemical shifts as well as 205Tl-2H coupling constants are estimated. The n.m.r.-parameters of the Tl(I) compounds are compared with the values of the literature. The paramagnetic 205Tl shifts of compounds of the type R2TlX (R = Me. Et, n-Pr. Ph; X = NO3, F, Br. I) are discussed with reference to the influence of substituents, solvents, and concentrations. The 205Tl shifts are arranged on the basis of a 0.3 M aqueous TlNO3 primary standard in a uniform shift scale and compared as to theoretical aspects of chemical bonds. Für die großzügige Unterstützung unserer Arbeit danken wir Herrn Prof. Dr. K.-D. Schleinitz.  相似文献   

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New Copper(I, II) Compounds Complexes of the type [CuII(N∩N)2][CuICl1+x]2x (N∩N = en, pn, 2-amino picoline) are prepared from Cu(N∩N)2Cl2 and copper(I) chloride. [CuII(enac)][CuICl2]2 — a complex with a macrocyclic cation — is obtained, by the reaction of Cuen2Cl2 in aqueous acetone. Diacetyl monoxime partially reduces copper(II) of Cu(NSMe)2Cl2 and in this way causes the formation of [Cu(NSMe)2][CuCl3] (NSMe = β-aminoethyl methylsulfide). On the other hand a template reaction of this oxime with Cu(NSMe)2 (ClO4)2 produces CuII(ONNSMe)(ClO4) (HONNSMe?CH3C(NOH)C(NCH2CH2SCH3)CH3), which shows a reduced paramagnetism. Basing on magnetic behaviour, i. r. and vis spectra the structure of the new compounds is discussed.  相似文献   

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Complexation of thallium(I) with ethane-1,2-dithiol has been studied polarographically in 25% ethanol, 0.5M-NaClO4, 0.01M-HClO4 and 0.002% Triton X-100. Thallium in presence of ethane-1,2-dithiol, reduces reversibly at d.m.e. and the plateau current is diffusion-controlled. The successive formation of two complexes, 1∶1 and 1∶2, is indicated byDeford andHume's method. The overall changes in the thermodynamic parameters viz. ΔG, ΔH, ΔS accompanying complexation reactions have also been reported.  相似文献   

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Zusammenfassung An Hand von komplexometrischen Magnesium- und Zinktitrationen wird die Wirksamkeit der Wasserstoffperoxydmaskierung des Urans gegenüber ÄDTA und Eriochromschwarz T gezeigt.  相似文献   

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The electrochemical reduction of dialkylthallium(III) cations in aqueus buffer solutions and dimethylformamide yields by the first electron transfer the instable intermediate {R2Tl}, which in dependence of the reaction conditions is electrochemical reduced to Tl° or disproportionates to R3Tl and Tl°. Phenyl-substituted organothallium compounds are reduced to Tl° and (C6H5)2Hg in one step.  相似文献   

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Mesityl Oxo Molybdenum and Tungsten Compounds. II. Unexpected Formation of Monomesityl Molybdenum(V,VI) Compounds The synthesis of known MoO2Mes2 from MoO2Cl2 and MgMes2 (1 : 1) in THF is accompanied by the formation of monomesityl molybdenum compounds. From ligand exchange and reduction arise [MesMoOCl3] ( 3 a ) and [MesMoO3] ( 3 c ). 3 a and 3 b crystallize in form of [(MesMoO3)2{Mg2Cl2(THF)5}2][MesMoOCl3]2(THF)2, which has been characterized by X-ray structural analysis. In 3 two MesMoO3 units are linked in a ring-like manner via magnesium ions. The anion 3 a , which possesses a distorted trigonal-bipyramidal arrangement, was also isolated as [Mg(THF)6][MesMoOCl3]2 which was investigated by X-ray analysis. The reaction of MoO2Cl2 with MgMes2 in a 1 : 0,5 ratio generates the compounds [Mg(THF)4(MoO3Cl)2] and MoOCl3(THF)2. Reaction pathways which may lead to these compounds are discussed.  相似文献   

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Zusammenfassung Zwei Methoden zur extraktiven Abtrennung des Urans von einer Reihe von Ionen werden beschrieben. Die Extraktion erfolgt aus schwefelsaurer Lösung mit N-Benzylanilin bzw. N-Butylanilin, gelöst in Chloroform. Nach Reextraktion mit Wasser erfolgt die quantitative Bestimmung mit PAR.
Summary Two methods for the extractive separation of uranium from a number of ions are described. The extraction is from a solution containing sulfuric acid by means of N-benzylaniline or N-butylanilin, dissolved in chloroform. After reextraction with water, there follows the quantitative determination with PAR.
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