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  • 1
    ISSN: 0268-2605
    Keywords: trimethylantimony ; molecular rearrangement ; demethylation ; speciation ; hydride generation ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The method of hydride generation for the speciation of antimony compounds was examined with respect to the problem of molecular "rearrangement'. Specifically, demethylation of trimethylstilbine during the analysis of trimethylantimony dichloride (Me3SbCl2) was studied. Previously published observations that enhanced demethylation takes place as a result of inadequate preconditioning of the analytical apparatus were found to be not reproducible. However, demethylation was enhanced as the pH decreased when using two different analytical methods: semi-continuous flow hydride generation-gas chromatography-atomic absorption spectrometry (HG- GC-AAS), and batch-type hydride generation- gas chromatography-inductively coupled plasma mass spectrometry (HG-GC-ICP MS). Applications of the hydride generation method to environmental samples revealed differences in analytical results at high and low pH, and enhanced demethylation taking place because of the matrix in a fungal extract sample. The authors recommend that researchers using the method of hydride generation for antimony compounds carefully test the reaction conditions with standard compounds and use the method of standard addition only. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 6 (1975), S. 399-407 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Problems regarding the raw material supply of steel improving heavy and minor alloy metals.The supply situation of steel improving heavy and minor alloy metals reveals that the absolute and relative concentration of the raw material output as well as the regional supply agglomeration in developing countries is much more marked as is the case with crude oil. Future development is expected to increase even the import dependence of few large producing countries in the Third World, thus increasing the risk of short-term availability bottlenecks, shortcomings in deliveries and cartelizations in view of a sharply rising demand of alloy metals and a shortage of Europe's own production. Besides the promotion of industrial potentialities to ensure a better adaptability to given supply situations - particularly recycling, substitution and stockpiling - there is a need for a government flanking raw material policy with national and international objectives.
    Notes: Die Versorgungslage bei stahlveredelnden Schwer- und Sondermetallen zeigt, daß die absolute und relative Konzentration der Rohstofförderung sowie die regionale Angebotsballung in Entwicklungsländern sehr viel ausgeprägter ist als beim Rohöl. Die zukünftige Entwicklung läßt erwarten, daß die Importabhängigkeit von wenigen großen Förderländern in der 3. Welt noch zunehmen wird, so daß sich die Gefahr von kurzfristigen Verfügbarkeitsengpässen, Belieferungsausfällen und Kartellbildungen, angesichts des stark steigenden Bedarfs an Legierungsrohstoffen und fehlender Eigenproduktion in Europa, verstärken wird. Neben der Förderung industrieller Möglichkeiten zur Erhöhung der Anpassungsfähigkeit an jeweilige Versorgungslagen - insbesondere Recycling, Substitution und Lagerbildung - besteht die Notwendigkeit einer staatlichen flankierenden Rohstoffpolitik mit nationaler und internationaler Zielstellung.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 14 (1931), S. 751-778 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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