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  • Artikel  (3)
  • ICP-MS  (1)
  • Intestinal absorption  (1)
  • nanoparticles  (1)
  • Springer  (3)
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  • Artikel  (3)
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  • Springer  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Method for the determination of thorium and uranium in urine by ICP-MS (1997)
    Springer
    Microchimica acta 126 (1997), S. 263-266 
    Details
    ISSN: 1436-5073
    Schlagwort(e): ICP-MS ; thorium ; uranium ; urine ; body-fluid ; trace elements
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract ICP-MS (inductively coupled plasma mass spectrometry) is shown as a very sensitive method for quantitative determination of Th and U concentration and excretion analysis in urine without any sample pretreatment. The current standard method for incorporation monitoring applies alpha-spectrometry, a very tedious and time consuming technique. ICP-MS offers an attractive alternative for monitoring of thorium and uranium body burdens in occupationally exposed subjects and also larger groups of the general population. A limit of determination of 0.5 ng/L in aqueous solutions and 1 ng/L in urine samples for both elements was achieved, with a precision of about ± 10% in the concentration range of appr. 10 ng/L. Due to the lack of a suitable reference material, the accuracy of the method was tested by comparing some of the results with those obtained by α-spectrometry, especially for U. There was a sufficient agreement on both results.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01242331
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Determination of biokinetic parameters for ingestion of radionuclides of zirconium in animals using stable tracers (2000)
    Springer
    Radiation and environmental biophysics 39 (2000), S. 53-58 
    Details
    ISSN: 1432-2099
    Schlagwort(e): Key words Biokinetics ; Internal dose ; Intestinal absorption ; Stable tracers ; Zirconium
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Physik
    Notizen: Abstract  Exposure to the radioactive isotope 95Zr, as in nuclear accidents, and to stable zirconium, due to its use in industry, has increased the interest in the biokinetics of this element. Information has been derived mainly from tests performed on animals by means of radioactive tracers. Due to the fact that extrapolation from animals to humans is always open to question, there is an increasing need of a methodology which allows data to be obtained directly from humans. The use of stable tracers, being ethically justifiable, is a powerful tool for providing this information. As two tracers of the same element must be utilized in order to evaluate gut absorption, an analytical technique which is capable of distinguishing and measuring simultaneously different isotopes of zirconium in biological samples is required. Preliminary tests on laboratory animals were performed in order to assess the feasibility of the double tracer technique combined with proton activation analysis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/PL00007687
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Characteristics of Fe2O3 Nanoparticles from Doped Low-pressure H2/O2/Ar Flames (1999)
    Springer
    Journal of nanoparticle research 1 (1999), S. 163-167 
    Details
    ISSN: 1572-896X
    Schlagwort(e): Fe2O3 ; nanoparticles ; low-pressure flame ; Fe(CO)5 ; flame synthesis approach
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik , Technik allgemein
    Notizen: Abstract A burner stabilized premixed low-pressure flame has been used to generate iron-oxide (Fe2O3) nanoparticles with sizes in the range 7–20 nm. The H2/O2/Ar flames were doped with different amounts of iron-pentacarbonyl (Fe(CO)5) with concentrations in the range 524–2096 ppm. The influence of precursor concentration on composition, structure, morphology, and size have been studied utilizing transmission electron microscopy (TEM), X-ray powder diffraction (XRD), measurements of the specific surface area (BET), and infrared spectroscopy (FT-IR). The product particles consist of both, the γ- and the α-phase of Fe2O3. Average particle sizes were measured in the range 7.4–16 nm depending on precursor concentration and flame conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1010056617437
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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