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  • Analytical Chemistry and Spectroscopy  (2)
  • Aktivierungsanalyse  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 18 (1995), S. 108-110 
    ISSN: 0935-6304
    Keywords: GC/Atomic Emission Detection (GC/AED) ; Reformulated gasolines ; Selective analyses of oxygenates ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A GC method for the determination of oxygenated additives in reformulated gasolines (RFG) is described. The method uses on-column injection and atomic emission selective detection of oxygenates using the 777 nm NIR emission line. Detection limits are approximately 10 ppm oxygen. Results compared well with other techniques, such as GC/FTIR.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 265 (1973), S. 93-97 
    ISSN: 1618-2650
    Keywords: Best. von Quecksilber in Lebensmitteln ; Aktivierungsanalyse ; Neutronen ; Destillation ; Isotopenaustausch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine Methode zur neutronenaktivierungsanalytischen Hg-Bestimmung in biologischem Material durch Destillation und Isotopenaustausch wird beschrieben. Die Kinetik der Hg-Abscheidung in Abhängigkeit der Parameter Zeit, pH-Wert, Volumen, Konzentration und Rührgeschwindigkeit wurde untersucht. Die Nachweisgrenze der Methode liegt bei 10−10g Hg für 100mg Probengewicht. Für Thunfisch wurde ein mittlerer Hg-Gehalt von 0,37 mg/kg mit Extremwerten von 0,066–1,64mg/kg gefunden; für Süßwasserfisch 0,33mg/kg (0,042–0,879mg/kg). Alle anderen ca. 150 untersuchten Lebensmittel haben einen mittleren Hg-Gehalt von 0,01 mg/kg (0,001–0,149 mg/kg). Verglichen mit den Werten, die vor 30 Jahren veröffentlicht wurden, liefern diese Ergebnisse keinen Grund zu der Annahme, daß der Hg-Gehalt von Lebensmitteln des deutschen Marktes angestiegen ist.
    Notes: Abstract A method for the determination of mercury in biological material by neutron activation, involving distillation and isotopic exchange, is described. The kinetics of mercury deposition as a function of time, pH-value, volume, concentration, and stirring velocity were investigated. The detection limit of the method is 10−10g Hg in 100 mg sample weight. For canned tuna the average mercury content was found to be 0.37mg/kg with extreme values of 0.066–1.64 mg/kg and for freshwater fish 0.33 mg/kg (0.042–0.879 mg/kg). Nearly 150 other food samples altogether showed average mercury concentrations of 0.01mg/kg (0.001–0.149mg/kg). Compared with data published some 30 years ago, these results give no reason to believe that the mercury content of foods on the German market has increased since that time.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The Raman spectra of a series of WO3—AI2O3 catalysts containing 1-30 wt-% of WO3 were investigated with respect to the effect of O2 calcination and H2O—D2O exposure. These studies showed that the frequencies of bands due to surface tungstate species can be shifted reversibly by as much as 6% of their values during alternate O2 calcination and H2O exposure cycles. The exchange of 18O for l6O in the surface tungstate was also investigated with Raman spectroscopy and ion-scattering spectrometry. The results were used to assign Raman bands to fundamental vibrations of the surface tungstate and to propose a mechanism of interaction between H2O and the surface tungstate that hitherto has not been addressed for WO3—AI2O3.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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