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  • Best. von Calcium  (1)
  • Certification  (1)
  • 2000-2004  (1)
  • 1980-1984
  • 1975-1979  (1)
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  • 2000-2004  (1)
  • 1980-1984
  • 1975-1979  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Producing SI-traceable reference values for Cd, Cr and Pb amount contents in polyethylene samples from the Polymer Elemental Reference Material (PERM) project using isotope dilution mass spectrometry (2000)
    Springer
    Accreditation and quality assurance 5 (2000), S. 314-324 
    Details
    ISSN: 1432-0517
    Keywords: Key words PERM ; ICP-MS ; PTI-MS ; IDMS ; Uncertainty budget ; Certification ; Polyethylene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract  The present paper describes the certification of the amount content of Cd, Cr and Pb in two different polyethylene materials within the third phase of the Polyethylene Elemental Reference Material (PERM) project. The analytical procedure to establish the reference values for Cd, Cr and Pb amount contents in these materials is based on isotope dilution mass spectrometry used as a primary method of measurement. Cd and Pb were measured with inductively coupled plasma-mass spectrometry and Cr with positive thermal ionization-mass spectrometry. The decomposition of the polymer matrix was carried out using a high pressure asher. Reference values for amount content, traceable to the SI-system, have been obtained for these three elements in both of the polyethylene samples of PERM. For each of the certified amount content values an uncertainty budget was calculated using the method of propagation of uncertainties according to ISO and EURACHEM guidelines. The measurement procedures, as well as the uncertainty calculations, are described for all three elements. In order to keep the whole certification process as transparent as possible, the preparations of various reagents and materials as well as the sample treatment and blending are described in detail. The mass spectrometry measurements and the data treatment are also explained carefully. The various sources of uncertainty present in the procedure are displayed in the uncertainty budgets. The obtained combined uncertainties for the amount content values were less than 2% relative (k=1) for all investigated elements. The amount contents were in the μmol/kg range, corresponding to mg/kg levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007690000146
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  • 2
    Electronic Resource
    Electronic Resource
    Massenspektrometrische Isotopenverdünnungsanalyse geringer Calciumkonzentrationen in Mineralien (1977)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 287 (1977), S. 121-127 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Calcium ; in Mineralien ; Isotopen-verdünnung/Massenspektrometrie ; Ionenaustauscher, Thermionen-MS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Ein Verfahren zur massenspektrometrischen Isotopenverdünnungsanalyse geringer Calciumkonzentrationen in Mineralien wurde entwickelt. Die einzelnen analytischen Teilschritte (Aufschlußverfahren mit Isotopenverdünnung, Calciumseparation und massenspektrometrische Messung) des Gesamtverfahrens werden beschrieben. Für einen 42Ca-Indicator wird die optimale Indicatorzugabe sowie Auswirkungen der massenspektrometrischen Messungen auf den Fehler des Analysenverfahrens diskutiert. Bei der chromatographischen Calciumabtrennung an einem stark sauren Ionenaustauscher wird eine vollständige Separation von Kalium erreicht. Der Calciumgehalt im Bereich von 0,15–0,004 Gew.-% zweier Kalifeldspäte und eines Lepidolithen wird mit externen relativen Standardabweichungen von 0,9–5,1% bestimmt.
    Notes: Summary A mass spectrometric isotope dilution analysis for the determination of small calcium contents is developed. The different steps (decomposition of the mineral including isotope dilution technique, calcium separation and mass spectrometric measurement) of the analytical procedure are described. For a 42Ca spike the optimum spike addition is calculated. The dependence of the analysis error on the mass spectrometric measurements is discussed. Using a chromatographic method with a strong acidic ion exchanger calcium can be completely separated from potassium. The calcium content in the range of 0.15–0.004% of two feldspars and of one lepidolite is determined with external relative standard deviations of 0.9–5.1%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00439851
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