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  • General Chemistry  (2)
  • Analyse von Anorgan. Material  (1)
  • 1970-1974  (1)
  • 1940-1944  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 1-6 
    ISSN: 1618-2650
    Keywords: Analyse von Anorgan. Material ; Massenspektrometrie ; Funkenionen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Von 32 Elementen wurden im Konzentrationsbereich 1–104ppm (Elementmasse/Elektrodenmasse) relative Empfindlichkeitsfaktoren (REF) für die funkenmassenspektrometrische Multielementanalyse bestimmt. Als leitendes Elektrodenmaterial wurde Graphit- und Silberpulver verwendet. Für zwei Drittel der untersuchten Elemente wurde eine Konzentrationsabhängigkeit der REF gefunden, die durch eine temperaturabhängige Verdampfung und dadurch bedingte Verarmung in der Elektrodenoberfläche erklärt wird. Für die REF in Silber-Pulverelektroden wurden im allgemeinen höhere Werte bei niedrigeren Abfunkzeiten als in Graphitelektroden gefunden. Daraus ergibt sich, daß trotz größerer Inhomogenitäten in der Elektrode im Konzentrationsbereich 〈103 ppm günstiger mit Silberpulver gearbeitet wird.
    Notes: Abstract Relative sensitivity factors (RSF) of 32 elements in the concentration range 1–104 ppm (mass of element/ mass of electrode) have been determined for spark source mass spectrometric analysis. Graphite and silver powder was used as conductive material. The RSF of about two thirds of the elements under investigation were found to be dependent on their concentration in the electrodes. This is thought to be due to volatilization at high temperatures whereby the concentration of these elements at the electrode surfaces is diminished. In general RSF's at silver powder electrodes are higher and necessary sparking times are shorter than those at graphite electrodes. Therefore the use of silver powder for determinations of concentrations 〈103 ppm is advantageous although experimental results show greater scatter due to inhomogeneity of the electrode.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 53 (1940), S. 204-209 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 54 (1941), S. 200-201 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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