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  • 1
    Electronic Resource
    Electronic Resource
    Densities and apparent molal volumes of some aqueous rare earth solutions at 25.deg.. III. Rare earth nitrates (1975)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 79 (1975), S. 1087-1096 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100578a011
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of homogeneity of selected reference materials for selenium by cyclic neutron activation analysis (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 151 (1991), S. 167-175 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The homogeneity of four reference materials was evaluated for Se by cyclic instrumental neutron activation analysis (CINAA). The relative standard deviation for Se measurements at ppb levels by CINAA was 〈12% for NIST Wheat Flour (SRM 1567) in 5–10 mg samples, while it was 〈11% for Chinese Hair (HH−CH-1), 〈13% for IAEA Animal Muscle (H-4) and 25% for IAEA Animal Blood (A-13) in 50 mg samples. The highest relative subsampling uncertainties were observed in the mass range of samples ≤50 mg for Chinese Hair, ≤100 mg for Wheat Flour and Animal Muscle and ≤300 mg for Animal Blood. The results of a one-way analysis of variance indicate that all reference materials above these mass ranges are adequately homogeneous with respect to Se distribution. Our data suggest that these materials, except Animal Blood, can be used as reference standards for Se in Quality assurance programs well below the sample masses re commended by the issuing agencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02040143
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of selenium in individual food items using the short-lived nuclide77mSe (1987)
    Springer
    Journal of radioanalytical and nuclear chemistry 110 (1987), S. 519-529 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The selenium content of a variety of food items representing a normal hospital diet has been determined by cyclic instrumental neutron activation analysis (CINAA) through the 162-keV gamma-ray of the77mSe nuclide. The CINAA method is very simple and rapid. It involves irradiation of a sample for 20 s, decay for 20 s, and counting for 20 s. The precision of the method has been significantly improved by recycling the samples up to 4 times. The accuracy has been evaluated by analyzing a number of certified reference materials of varied selenium levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035541
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of trace elements in food by neutron activation analysis (1988)
    Springer
    Journal of radioanalytical and nuclear chemistry 124 (1988), S. 65-77 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Neutron activation analysis (NAA) methods have been developed for the determination of major, minor and trace elements in duplicate diets and individual food items. These include a cyclic instrumental NAA (CINAA) method for measuring Se content through its short-lived nuclide77mSe; epithermal INAA (EINAA) for I and As; conventional INAA for Br, Ca, Cl, Co, Cr, Fe, K, Mg, Mn, Na, Rb, Sb, Sc, Sn and Zn; combination of EINAA and INAA for Al; radiochemical NAA (RNAA) for As, Au, Co, Cu, Fe, Hg, Mo, Sb, Se and Zn; and preconcentration NAA (PNAA) for U and Th. Accuracy of measurements have been evaluated by analyzing a number of biological and diet reference materials. Multielement concentrations of diets and foods have been measured by these methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02035506
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of sampling constants for selenium in biological reference materials by neutron activation (1990)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 338 (1990), S. 399-407 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A cyclic instrumental neutron activation analysis method has been used to calculate sampling constants and to evaluate homogeneity for Se in five biological reference and certified reference materials, namely NRC lobster hepatopancreas (RM TORT-1), IAEA horse kidney (RM-H8), and NIST bovine liver (SRM-1577a), oyster tissue (SRM-1566) and mixed diet (RM-8431). The between-weight-range heterogeneity has been observed to be no greater than the within-weight-range heterogeneity. The subsampling standard deviation (S s) has been found to be less than the measurement standard deviation (S m) for H-8 (〉5 mg sample) and TORT-1 (〉50 mg). For 1577a, S s is almost equal to S m; while S s is 2–3 times higher than S m for the other two materials. The sampling constants varied between 0.04 and 3.0 g for four materials while the mixed diet had a value of 31 g.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00322503
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    Paper (German National Licenses)
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