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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Crystal Growth 87 (1988), S. 185-192 
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 2 (1923), S. 80-80 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 2 (1923), S. 2061-2064 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 1 (1922), S. 1885-1889 
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 318 (1984), S. 498-501 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird die Bestimmung extrem kleiner Quecksilbermengen in Wässern beschrieben. Das Verfahren besteht aus einem Anreicherungsschritt, bei dem durch direkten Kontakt der Probe mit einem Goldkollektor das Quecksilber gesammelt wird, sowie einer nachweisstarken atomabsorptionsspektrometrischen Detektion. Die Nachweisgrenze beträgt 300 pg. Bei Probevolumina von 1 l sind damit Konzentrationen unter 0,5 ppt bestimmbar. Organische Quecksilberverbindungen werden miterfaßt. Die Vorteile gegenüber anderen Anreicherungsmethoden werden diskutiert.
    Notes: Summary The determination of extreme low amounts of mercury in waters is described. The procedure comprises an enrichment step, in which the mercury is collected by direct contact of the sample with a gold collector, as well as high sensitive atomic absorption spectrometric detection. A detection limit of 300 pg was obtained. Concentrations below 0.5 ppt are detectable with a sample volume of 1 l. Organomercury compounds are determined, too. The advantages in comparison with other enrichment techniques are discussed.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 29 (1994), S. 4686-4693 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Oxynitride powders suitable for sintering to form dielectric ABO3-type perovskites have been prepared by nitriding barium carbonate and tantalum oxide. Both heat treatment in air and reaction in flowing ammonia yield isostructural oxynitride phases, but the amount and electronic state of the oxynitrides depend on the nitriding gas conditions. A red-brown oxynitride of high nitrogen content is described as Ba2Ta2O3N2 containing Ta (IV) ions, but after heat treatment in air the colour changes to white indicative of Ta(V) and a stoichiometry of BaTaO2N results. A third possibility is identified in an oxynitride containing both Ta (IV) and Ta (V) with an intermediate nitrogen content. Through studies involving thermal analysis and X-ray diffraction, the materials are characterized in powder form and possible sintering conditions are suggested which involve a rapid heating rate and a densification temperature of 1500 °C.
    Type of Medium: Electronic Resource
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