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  • 1985-1989  (2)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of radioanalytical and nuclear chemistry 116 (1987), S. 271-284 
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The extraction equilibria of Th in tri-n-octylphosphine oxide (TOPO)−HNO3−H2O systems have been investigated in the absence and presence of water-miscible alcohols and acetone. The influence of TOPO concentration in an inert diluent (toluene) and the concentration of nitric acid and the water-miscible additives have been systematically examined. The slopes of the log-log plots of DTh vs. the TOPO concentration (up to 0.02M) are found to be close to 3 over a wide range of polar phase compositions leading to a coordination number of 11 for Th. The DTh values were determined as a function of the concentration of uranyl nitrate in the aqueous phase, while the effect of additives was also examined in the absence and presence of uranyl nitrate in the polar phase. The results show that at TOPO concentrations above about 2.5 · 10−3 M (about 1%) in toluene, polymerization of the solvent occurs.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of radioanalytical and nuclear chemistry 108 (1987), S. 317-326 
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A simple method has been developed for the rapid separation of234Th /UX1/ from uranyl nitrate hexahydrate. The method is based on selective dissolution of uranyl nitrate by diethyl ether on a filter paper. It is shown that almost all UX1 is adsorbed by the filter paper which can be desorbed and brought into solution by 5N HCl or HNO3. The effect of different parameters on the separation have also been investigated.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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