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  • 1995-1999  (4)
  • 1980-1984  (2)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Adsorption of Sb(V) from radioactive organic waste solutions on different adsorbents (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 214 (1996), S. 41-50 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The adsorption of radioantimony (122Sb and124Sb) on pyrolysis residue, bentonite and fly ash from its solutions in benzene, toluene and xylene was investigated. The radioactivity of the isotopes was measured in the organic solution above the adsorbents as a function of time. After 24 h, the sequence of uptake of Sb(V) in benzene and toluene is: pyrolysis residue〉bentonite〉fly ash, while in xylene it is bentonite〉pyrolysis residue〉fly ash. The maximum lg kD value was 3.37 for the toluene-pyrolysis residue system. Desorption of Sb(V) from the loaded material was studied using both tap water and 1M HCl. The latter has more desorption power, evidently, due to hydrolysis and production of insoluble species in the neutral medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02165057
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    Paper (German National Licenses)
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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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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on sorption of antimony and europium from liquid organic and aqueous radioactive wastes on different sorbents (1997)
    Springer
    Journal of radioanalytical and nuclear chemistry 221 (1997), S. 153-159 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Sorption of124Sb(III) from benzene, toluene, o-xylene and nitrobenzene on treated fly ash, pyrolysis residue and bentonite clay was studied at room temperature using the batch method. In comparison to a former study for the sorption of124Sb(V), the results revealed relatively higher sorption of the trivalent state than the pentavalent one. According to the type of the nonpolar solvent used, the order of uptake of the radioactive isotopes was often o-xylene≥toluene〉benzene. The sorption tendency of the sorbents used towards the radionuclides was: bentonite≥pyrolysis residue〉treated fly ash. Sorption from an aqueous medium on the same sorbents has also been investigated for124Sb(III) compared to124Sb(V),152Eu(III) and their mixtures. The obtained results showed that the order of uptake of the different radionuclides was: Eu(III)〉〉Sb(III)〉Sb(V)〉mixture. The investigation was extended to the desorption studies of these radionuclides in the acidic and the neutral media from the dried radioactivity loaded sorbents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035258
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  • 4
    Electronic Resource
    Electronic Resource
    Extraction and separation of zinc and cadmium chlorides by TOPO from mixed media (1998)
    Springer
    Journal of radioanalytical and nuclear chemistry 227 (1998), S. 143-146 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The effect of water-miscible alcohols and acetone on the extraction and separation of Cd and Zn chlorides by TOPO was systematically investigated. The maximum extraction of Zn chloride with 0.1 M TOPO decreases in the order: acetone〉methanol〉ethanol〉2-propanol〉2-butanol. For alcohols, the sequence of decreasing extractability is thus parallel to the order of their dielectric constants. This can be explained by the increase of HCl extraction by TOPO in the same direction. The presence of additives in the polar phase prevents the formation of a bulky white precipitate encountered during extraction of ZnCl2 from pure aqueous solutions. A decrease of Cd chloride extraction was generally noticed in presence of additives; this is more noticeable for the longer chain alcohols. The highest separation factor (E for ZnCl2 and CdCl2 in 0.48M HCl is obtained from 30% methanol (13.8 compared to about 3.8 in absence of methanol) and from 10–20% acetone where it reaches 30.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02386447
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on pollution of water and air dust of Benghazi using various analytical methods (1984)
    Springer
    Journal of radioanalytical and nuclear chemistry 81 (1984), S. 359-368 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Nondestructive neutron activation analysis has been used for the analysis of 17 out of 24 elements in 12 samples of air particulate matter collected from various localities in Benghazi. Both relative and monostandard methods were used. The neutron activation method was supplemented with graphite furnace atomic absorption, so that most toxic elements could be assayed in the same samples. Thus Cd, Cr, Cu, Mn, Ni, Pb, V and Zn could be analysed quantitatively in most of the samples. It has been found that contamination of the atmosphere of Benghazi with dust is largely due to heavy construction work in the city, action of wind on the surface of land around the city and the release of exhaust products from vehicles and airplanes. Particular contamination due to industrial activities was not noticeable. Results on samples from Benghazi were compared with those from Prague, Munich and Sendai.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02135389
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    The monostandard method in thermal neutron activation analysis of geological, biological and environmental materials (1984)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 319 (1984), S. 47-53 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary A simple method is decribed for instrumental multielement thermal neutron activation analysis using a monostandard. For geological and air dust samples, iron is used as a comparator, while sodium has advantages for biological materials. To test the capabilities of this method, the values of the effective cross sections of the 23 elements determined were evaluated in a reactor site with an almost pure thermal neutron flux of about 9·1012 n·cm−2·s−1 and an epithermal neutron contribution of less than 0.03%. The values obtained were found to agree mostly well with the best literature values of thermal neutron cross sections. The results of an analysis by activation in the same site agree well with the relative method using multielement standards and for several standard reference materials with certified element contents. A comparison of the element contents obtained by the monostandard and relative methods together with corresponding precisions and accuracies is given.
    Notes: Zusammenfassung Die Monostandardmethode wurde erstmals auf die Aktivierungsanalyse mit rein thermischen Neutronen aus der thermischen Säule des Reaktors FRJ-2 (mit epithermischen Anteilen von 〈 0,03%) angewendet. Hier sind die theoretischen Verhältnisse und damit auch Gleichungen besonders einfach. — Die bei einem Neutronenfluß von 9·1012 n·cm−2·s−1 ermittelten effektiven Neutroneneinfangquerschnitte stimmen häufig gut mit den Literaturwerten überein. — Für geologische Proben wurde Eisen, für biologisches Material Natrium als Komparator, d.h. Monoelementstandard, verwendet. Es konnten über zwanzig Elemente in Andesit, Granit, Flugstaubasche, Luftstaub, Pflanzenmaterial und Obstblättern bestimmt werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00476228
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    Paper (German National Licenses)
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