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  • Analytical Chemistry and Spectroscopy  (1)
  • Röntgenfluorescenz-Spektrometrie  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 307 (1981), S. 177-184 
    ISSN: 1618-2650
    Keywords: Röntgenfluorescenz-Spektrometrie ; Eliminierung von Interelementeffekten ; Pulververdünnung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary If the concentration of elements with Z〉22 (Ti) is to be determined in mineral samples and if the concentration of any of these elements is greater than ≈ 1%, the sample is diluted by grinding it together with an appropriate amount of quartz powder in an agate mortar mill. The diluted sample is measured in powdered form in a spectro-cup at practically infinite thickness by energy-dispersive X-ray fluorescence; the counting rates are corrected by means of the Compton scattering peak and evaluated by use of calibration curves obtained by measuring standards on the basis of silica gel. The applicability of this method is established by measuring the concentrations of 12 elements with Z〉22 in 14 mineral samples of varying composition.
    Notes: Zusammenfassung Wenn die Konzentration von Elementen mit Ordnungszahlen Z〉22 (Ti) in mineralischen Proben bestimmt werden soll, und wenn die Konzentration eines dieser Elemente größer als ≈ 1% ist, wird die Probe durch Mahlen mit einer geeigneten Menge Quarz-Pulver in einer Achatmörsermühle verdünnt. Die verdünnte Probe wird in Pulverform in einem „spectro-cup“ bei praktisch unendlicher Schichtdicke durch energiedispersive Röntgenfluorescenz gemessen, die Zählraten werden mit Hilfe des Compton-Streupeaks korrigiert und unter Verwendung von Eichkurven ausgewertet, die durch Messung von Standards auf der Basis von Silicagel erhalten werden. Die Anwendbarkeit dieser Methode wird überprüft durch Bestimmung der Konzentration von 12 Elementen mit Ordnungszahlen Z〉22 in 14 mineralischen Proben verschiedener Zusammensetzung.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 12 (1983), S. 175-181 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The construction of a mobile XRF unit is described. It consists of a radionuclide source (109Cd), shielding, a sample exchanger for powdered samples, a semiconductor detector and an electronic measuring and evaluation system. The disadvantage of the supply of liquid nitrogen or liquid air for the semiconductor detector is avoided by use of a mobile unit for the production of liquid air constructed for this purpose. Numerous measurements were carried out at several location within the Federal Republic of Germany.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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