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  • 1
    Electronic Resource
    Electronic Resource
    Studies on the extraction behavior of Zr(IV), Ce(III), Th(IV) and U(VI) from aqueous solutions of Arsenazo-I with HDEHP, HTTA, TDA and TCMA (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 207 (1996), S. 369-382 
    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 behavior of Zr(IV), Ce(III), Th(IV) and U(VI) from aqueous solutions containing Arsenazo-I with the organic solvents tridodecylamine (TDA), 1-[thenoyl-(2)]-3-3-3-trifluoroacetone (HTTA), di(2-ethylhexyl) phosphoric acid (HDEHP) and tricaprylmethylammonium chloride (TCMA) in xylene has been investigated. Effect of hydrogen ion concentration in the aqueous phase, Arsenazo-I concentration, as well as the effect of solvent concentration on the extraction was studied. Some alternatives for separation of the elements studied were recommended enabling the spectrophotometric determination of these elements using Arsenazo-I without interference.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02071242
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorption of radioisotopes from their organic solutions on filter papers the Sb(III)-nonpolar solvents-system (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 209 (1996), S. 135-145 
    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 Sb(III) chloride by nonpolar solvents from 0.15M HCl was studied as a function of sulphuric acid concentrations in the aqueous phase. The distribution of Sb(III) chloride between the nonpolar solvents benzene, toluene, xylene, nitrobenzene, cyclohexane, chloroform and carbon tetrachloride and filter paper is reported. In case of benzene the Sb(III) activity (given in counts·s−1·ml−1) decreases from ∼1500 to ∼200 after 24 hours. The corresponding values are about 1200 and 540 for toluene, 1330 and 50 for xylene, 1050 and 700 for nitrobezene, 1080 and 22 for cyclohexane, 330 and 30 for chloroform and 130 and 40 for carbon tetrachloride. More than 95% of the adsorbed Sb(III) is desorbed by 1M HNO3, 1M HCl or 0.5M H2SO4 by contacting the loaded filter paper with any of these acids for 27 hours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063538
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  • 3
    Electronic Resource
    Electronic Resource
    Comparative studies on the ion exchange behaviour of UO2(II), Ce(III) and Am(III) with Chelex-100 from thiocyanate media (1985)
    Springer
    Journal of radioanalytical and nuclear chemistry 91 (1985), S. 91-97 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The distribution of UO 2 2+ , Ce3+ and Am3+ between Chelex-100 and 0.2 and 5.0M ammonium thiocyanate solutions of different hydrogen ion concentrations has been investigated. The results obtained are compared with parallel experimental results using the anion exchanger Dowex-1×4 and the cation excharger Dowex-50×8. It is found that Chelex-100 can act as anion exchanger at pH〈2 and as cation and chelate exchanger at higher pH. A main feature of the distribution results of UO 2 2+ , Am3+ and Ce3+ with Chelex-100 is the very high distribution coefficient for the three cations at pH higher than 3.5 from aqueous solutions containing 0.2 or 5.0M ammonium thiocyanate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02036313
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  • 4
    Electronic Resource
    Electronic Resource
    Ion exchange studies of Arsenazo-III and thorium(IV) from aqueous solutions of Arsenazo-III with AG-2×8, Dowex-50 W×8 and Chelex-100 (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 198 (1995), S. 77-87 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The sorption behavior of Th(IV) from intermediate acidic solutions (0.5–1.5N HCl) of Arsenazo-III with three different types of ion exchangers, namely Dowex-50 W×8, AG-2×8 and Chelex-100 is studied at different concentrations of Arsenazo-III corresponding to metal: reagent ratio of 1∶1 to 1∶3. The sorption behavior of Arsenazo-III with AG-2×8 and Chelex-100 under various experimental conditions is studied as well. Complete sorption of the reagent on AG-2×8 under all studied conditions is found. The sorption process from solutions at high pH-values is found to be relatively slow. Complete sorption of reagent on Chelex-100 is found from acidic solutions. The percent uptake decreases sharply with increasing pH value. While partial sorption of Th(IV) or Th(IV)-Arsenazo-III complexes on Dowex-50 W×8 or AG-28, respectively, is found, Chelex-100 is found to be selective for concentrating thorium as coloured Arsenazo-III complex which may be useful in ion exchange phase absorptiometry. The sorbed complex from 0.5N HCl solutions of Arsenazo-III is proved to be ThL.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02038247
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on the sorption behavior of Arsenazo-I, U(VI) and Th(IV) species from aqueous solutions of Arsenazo-I on different types of ion exchangers (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 209 (1996), S. 51-63 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Three different types of ion exchangers namely Dowex-50 WX8, AG-2X8 and Chelex-100 are used to study the sorption behavior of Th(IV) and U(VI) from solutions of Arsenazo-I. The sorption behavior of Arsenazo-I itself is also studied. Possible species sorbed on these resins or present in solutions of U(VI)-and Th(IV)-Arsenazo-I at different concentrations and at different hydrogen ion concentrations are identified. From the obtained data, optimal conditions for separating the two elements are recommended. The possibility of individual concentration of Th(IV) and U(VI) as coloured Arsenazo-I complexes on AG-2X8 is evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063531
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  • 6
    Electronic Resource
    Electronic Resource
    Ion exchange studies of U(VI) from aqueous Arsenazo-III solutions using AG-2X8, Dowex-50WX8 and Chelex-100 resins (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 209 (1996), S. 157-169 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The distribution of U(VI) between the anion exchanger AG-2X8, the cation exchanger Dowex-50WX8 and the chelating resin Chelex-100 and aqueous solutions of Arsenazo-III at different pH values was studied. The concentration of Arsenazo-III was in the range of 1.53·10−4–1.23·10−3M. Equilibrium pH was varied from 1.0 to 8.78 while U(VI) original concentration was held constant at 3.39·10−4M. The effect of Arsenazo-III concentration and the variation of hydrogen ion concentration on U(VI) species formed in solution as well as the sorbed species was discussed. Use was made of IR spectroscopy to investigate the sorption behavior. The sorption of some interfering ions such as Th(IV), Zr(IV) and Ce(III) on the resins used at optimum conditions for the sorption of U(VI) was also investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02063540
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  • 7
    Electronic Resource
    Electronic Resource
    Sorption and separation of some elements of nuclear importance using Chelex-100 (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 222 (1997), S. 55-59 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Chelex-100, in the anionic form has been studied for its ability to perform selective separation and concentration of some metal ions of nuclear importance from mineral acid solutions. The sorption behavior of Zr(IV)−Nb(V), Mo(VI), Tc(VII), Te(IV) and U(VI) from solutions of hydrochloric and sulphuric acids on Chelex-100 has been studied under static and dynamic conditions. Mo(VI) and Tc(VII) have been concentrated on the resin from hydrochloric or sulphuric acid solutions at low acidities probably, as the anions MoO 4 2− and TcO 4 − , respectively. Te(IV) has been isolated from hydrochloric acid solutions of normalities ≥6 in the form of the anionic chloro complex TeCl 6 2− . Optimum conditions for elution and separation of Mo(VI), Tc(VII), Te(IV) and U(VI) were recommended.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02034247
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  • 8
    Electronic Resource
    Electronic Resource
    Uptake studies of some fission products using ceramic materials (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 222 (1997), S. 61-67 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The uptake of Eu(III) and Zr(IV) was studied on ceramic materials of TiO2, SiO2 and Al2O3, prepared by the hydrolysis process. The uptake behavior of Eu(III) and Zr(IV) was investigated under different experimental conditions such as contact time, pH-value in the presence and in absence of complexing agent. X-ray fluorescence, powder morphology, specific surface area, X-ray diffraction analysis in addition to the DTA and TG were applied on the tested ceramic samples. The present study showed that the ceramic materials, prepared by an advanced technique are not only efficient for uptake of Eu(III) and Zr(IV), but also permitted the separation of these radioisotopes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02034248
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    Paper (German National Licenses)
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