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  • 1960-1964  (1)
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    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 204 (1964), S. 413-420 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The liquid-liquid extraction and precipitation of anionic complexes of transition metals employing selenonium salts are investigated. Triphenylselenonium dichromate, perchlorate and molybdate are advantageous because of their low solubility (the tungstate is easily soluble). [(C6H5)3Se]2Cr2O7 can be extracted quantitatively. [(C6H5)3Se]ClO4 is suitable for the detection of 5 μg of ClO4 − in presence of high quantities of ClO3 −. The liquid-liquid extraction of chromium as [(C6H5)3Se]2Cr2O7 allows the determination of 25 μg Cr in cast-iron and steels, containing manganese, vanadium and molybdenum. The cation [(C6H5)3Se]+ in selenonium compounds can be determined by precipitation as [(C6H5)3Se] [(C6H5)4B].
    Notes: Zusammenfassung Es werden die Extraktions- und Fällungsreaktionen komplexer Übergangsmetall-Anionen untersucht. Durch geringe Löslichkeiten zeichnen sich u. a. das Triphenylselenonium-Dichromat, Perchlorat und -Molybdat aus (Wolframat leicht löslich). Die Verbindung [(C6H5)3Se]2 Cr2O7 ist quantitativ extrahierbar, [(C6H5)3Se]ClO4 eignet sich zum Nachweis von ClO4 −-Mengen ab 5 μg neben großen Mengen ClO3 −. Die extraktiv-photometrische Bestimmung von Chrom als [(C6H5)3Se]2Cr2O7 ermöglicht die Ermittlung von 25 μg Cr neben Mangan und Vanadium in Stählen verschiedenster Zusammensetzung. In Triphenylselenoniumverbindungen kann das Kation als [(C6H5)3Se][B(C6H5)4] gravimetrisch bestimmt werden.
    Type of Medium: Electronic Resource
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