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  • Mass spectrometry  (2)
  • Best. von Bromid in Chemikalien  (1)
  • Elsevier  (2)
  • Springer  (1)
  • Blackwell Publishing Ltd
  • Oxford University Press
  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Analytica Chimica Acta 283 (1993), S. 230-245 
    ISSN: 0003-2670
    Keywords: Biogenic halogenated methanes ; Gas chromatography ; Halogens ; Heavy metals ; Iodine cycle ; Ion chromatography ; Isotope dilution analysis ; Mass spectrometry ; Nitrate cycle ; Trace detection
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Analytica Chimica Acta 286 (1994), S. 283-290 
    ISSN: 0003-2670
    Keywords: Chromium ; Interlaboratory studies ; Isotope dilution methods ; Mass spectrometry ; Waters
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 306 (1981), S. 245-251 
    ISSN: 1618-2650
    Keywords: Best. von Bromid in Chemikalien ; Massenspektrometrie/Isotopenverdünnungsanalyse ; negative Thermionisation, Reinchemikalien
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Entwicklung einer massenspektrometrischen Isotopenverdünnungsanalyse zur Bromidbestimmung wird beschrieben. Dabei werden in einer Zweiband-Ionenquelle negative Thermionen erzeugt. Die Abhängigkeit der Br−-Ionenstromintensität und des gemessenen79Br/81Br-Verhältnisses von Ionisierungsbandtemperatur und -material sowie von der chemischen Probenform wird untersucht. Mit Re-Bändern und AgBr als Probensubstanz werden relative Standardabweichungen der Bromisotopenverhältnismessung von 0,08% erreicht. In verschiedenen Chemikalien werden Bromidspurengehalte im Bereich von 1,3 ppb bis 136 ppm mit relativen Standardabweichungen zwischen 1 und 15% bestimmt. Dabei erfolgt die Bromidabtrennung entweder über eine Anionenaustauschersäule oder durch Ausfällung als AgBr.
    Notes: Summary The development of a mass spectrometric isotope dilution analysis for bromide trace determination is described. Negative thermal ions are produced in a double-filament ion source. The Br− ion beam intensity and the measured79Br/81Br isotope ratio in dependence on the ionization filament temperature and filament material as well as on the chemical state of the sample are investigated. Using rhenium filaments and AgBr as a sample, relative standard deviations of 0.08% are obtained for the bromine isotope ratio determination. In different chemicals the trace content of bromide has been determined to be within the range of 1.3 ppb to 136 ppm with relative standard deviations of 1–15%. For the bromide separation a chromatographic column with an anion-exchange resin or a precipitation of Br− as AgBr is used.
    Type of Medium: Electronic Resource
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