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  • 1
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On the basis of previous ground-based and fly-by information, we knew that Titan's atmosphere was mainly nitrogen, with some methane, but its temperature and pressure profiles were poorly constrained because of uncertainties in the detailed composition. The extent of atmospheric electricity ...
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 53 (1965), S. 322-324 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Arbeitsvorschriften für den qualitativen Nachweis von Fluorid, Fluosilikat, Fluoborat und Sulfat in deren Gemischen werden angegeben. Fluorid, Fluosilikat und Fluoborat werden durch geeignete Modifikationen der Siliciumtetrafluoridprobe nachgewiesen. Nach Entfernung dieser Ionen durch Zusatz ammoniakalischer Calciumnitratlösung wird Sulfat durch Fällung mit Bariumnitrat nachgewiesen.
    Abstract: Résumé On décrit des procédés d'identification qualitative de fluorures, fluosilicates, fluoborates et sulfates en mélanges. On identifie les fluorures, fluosilicates et fluoborates par l'essai au tétrafluorure de silicium, après modifications adéquates. On recherche les sulfates en les précipitant par le nitrate de baryum après élimination des ions précédents par addition de nitrate de calcium ammoniacal.
    Notes: Summary Procedures for the qualitative identification of fluoride, fluosilicate, fluoborate and sulphate in mixtures are described. Fluoride, fluosilicate and fluoborate are identified by suitable modifications of the silicon tetrafluoride test. Sulphate is identified by precipitation with barium nitrate, after the removal of the preceding ions by the addition of ammoniacal calcium nitrate.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 56 (1968), S. 1273-1276 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Der qualitative Nachweis von Selenit, Selenat, Tellurit und Tellurat durch Fällung ihrer Silbersalze und deren selektive und charakteristische Reduktion wurde beschrieben. Tellurat kann außerdem auch durch Fällung mit Calcium nachgewiesen werden.
    Notes: Summary A procedure is described for the qualitative identification of selenite, selenate, tellurite, and tellurate by means of their precipitation as silver salts, followed by a series of selective and characteristic reduction tests on these precipitates. Tellurate may also be identified via precipitation of its calcium salt.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 53 (1965), S. 318-321 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die durch Borat und Fluoborat verursachte Störung des Fluoridnachweises nach dem Bleiplattenverfahren läßt sich durch Prüfung auf Kieselerde und Borat im Wassertropfen vermeiden, deren Anwesenheit in der Probe hiermit eindeutig feststellbar ist.
    Abstract: Résumé On peut éliminer l'interférence des fluorures avec les borates et les fluoborates dans l'essai à la lame de plomb en effectuant la recherche de la silice et des borates sur une goutte d'eau, ce qui permet l'identification positive de la présence de silice et de borate dans l'échantillon.
    Notes: Summary Interference with the lead plate test for fluoride by borate and fluoborate can be eliminated by applying tests for silica and borate to the water drop, these tests allowing positive identification of the presence of silica and borate in the sample.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 55 (1967), S. 690-701 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Analysen-Schemata für die Kupfer-Zinn-Gruppe wurden besprochen. Die Vorteile des Analysenganges der Midlands Association for Qualitative Analysis werden diskutiert.
    Abstract: Résumé Examen des différents processus d'analyse du groupe cuivre-étain. Discussion des avantages de la technique recommandée par la Midlands. Association pour l'analyse qualitative.
    Notes: Summary Schemes for the analysis of the Copper-Tin group are reviewed. The advantages of the scheme recommended by the Midlands Association for Qualitative Analysis are discussed.
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