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  • 1995-1999  (6)
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Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    Calorimetric and Laser Induced Fluorescence Investigation of the Complexation Geometry of Selected Europium-gem-Diphosphonate Complexes in Acidic Solutions (1995)
    s.l. : American Chemical Society
    Inorganic chemistry 34 (1995), S. 2753-2758 
    Details
    ISSN: 1520-510X
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ic00114a038
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Current status of radioactive waste disposal (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 203 (1996), S. 575-590 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract This paper describes the technical issues involved in the development of a feasible solution toward permanent radioactive waste disposal. Recent progress on internationally collaborative research efforts concerning the multibarrier concept, in situ experiments, computer modeling and natural analogues are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02041530
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Redox speciation of plutonium (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 219 (1997), S. 203-210 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract Knowledge of the oxidation state distribution of plutonium in natural waters is necessary in modeling its behavior in environmental systems. The redox speciation of plutonium is complicated by such effects as hydrolysis, complexation, disproportionation, solubility, and redox interchange reactions. The insolubility of Pu(OH)4 is often the limiting factor of the net solubility of plutonium in oxic natural waters where Pu(V)O 2 + is the most stable oxidation state. Perturbations to the oxidation state speciation due to the complexation chemistry of the different oxidation states of plutonium and to the insolubility of plutonium(IV) in neutral aquatic systems are discussed. The merits and limitations of some chemical separation techniques used to study redox speciation of plutonium are presented, and recommendations made for obtaining reliable oxidation state distribution data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02038501
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  • 4
    Digitale Medien
    Digitale Medien
    Comparison of two models for metal-humic interactions (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 221 (1997), S. 67-71 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract Humic acid has been shown to play a significant role in the environmental behavior of many metal cations as it can function as both a complexant and a redox agent. A number of models have been proposed to explain their complexing role, but most use quite different chemical descriptions of the metal-humate interactions. Two of these models which have been applied to humic acid interaction with actinide cations are briefly discussed. In one model in which humics are treated as anionic polyelectrolytes, cations can bind to specific anionic donor sites (site binding) as well as be attracted by the net anionic charge of the macromolecules (the Polyelectrolyte Model). In the second model (the Charge Neutralization Model), the binding for each cation is assumed to be associated with a number of carboxylate groups equal to the cationic charge. It is concluded that the Charge Neutralization Model is more useful in geochemical calculation codes, whereas the Polyelectrolyte Model can provide more insight into the chemical behavior of the humic acids.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02035244
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  • 5
    Digitale Medien
    Digitale Medien
    Solvent extraction of Eu, Th, U and am by N,N′-dimethyl-N,N′-dihexyl-3-thiopentanediamide and thenoyltrifluoroacetone (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 222 (1997), S. 271-274 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract The diamide, N,N′-dimethyl-N,N′-dihexyl-3-thiopentanediamide (DMDHTPDA) was synthesized and thested for extraction of Eu(III), Am(III), Th(IV) and U(VI). DMDHTPDA shows a very weak complexation with these metal ions, which can be attributed to the soft base nature of the sulfur atom. None of the cations were extracted into the organic phase when DMDHTPDA alone was present. Synergistic extraction was measured for DMDHTPDA plus thenoyltrifluoroacetone. From the extraction dependencies on pH and extractant concentration, formation of mixed TTA+DMDHTPDA complexes were indicated. Except for the Th(IV) system, the separation and synergistic factors were smaller for the TTA+DMDHTPDA extractant than for the system of TTA+DMDHOPDA (the oxo ether analog of DMDHTPDA).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02034285
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  • 6
    Digitale Medien
    Digitale Medien
    Extraction behaviors of Eu, Th, U and Am with diamides+thenoyltrifluoroacetone (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 207 (1996), S. 383-394 
    Details
    ISSN: 1588-2780
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Energietechnik
    Notizen: Abstract N,N′-dimethyl-N,N′-dihexyl-3-oxapentanediamide, DMDHOPDA, N,N′-dihexyl-3-thiopentanediamide, DHTPDA and N,N′-dihexyl-3-oxapentanediamide, DHOPDA were synthesized and tested for the synergistic extraction of Eu3+, Th4+, UO 2 2+ , NpO 2 + and Am3+ with thenoyltrifluoroacetone (HTTA). Although Eu3+, Th4+, UO 2 2+ and Am3+ were not extracted by DHTPDA or DHOPDA alone, they were extracted synergistically when combined with HTTA. Analysis of the dependency of extraction on pH and extractant concentration indicated that the dominant extracted species were Eu(TTA)3(A), Th(TTA)3(A)(X), UO2(TTA)2(A) and Am(TTA)3(A) (where A is diamide, and X is chloroacetate or ClO 4 − ).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02071243
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