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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 60 (1972), S. 811-817 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung 3-Nitroso-4-hydroxycoumarin wird als neues Reagens für die spektrophotometrische Bestimmung von 125 μg bis 0,50 mg Th(IV) in Dioxan: Wasser = 3: 1 als 1: 1-Komplex mit orange-roter Farbe mit einem Absorptionsmaximum bei 419 nm bei pH 4,5–6,0 empfohlen. Bei einem Einsatz von 9,6 ppm Th(IV) stört die hundertfache Menge Acetat, Citrat, Tartrat nicht. Auch 50 ppm UO2 2+, 75 ppm Ce3+, La3+, Gd3+, 4,5 ppm Ce4+, 25 ppm Tm3+, Zr4+, 100 ppm Ti4+, V5+, MoO4 2− bzw. WO4 2− stören nicht.
    Notes: Summary 3-Nitroso-4-hydroxycoumarin is suggested as a new reagent for the spectrophotometric determination of 125 μg to 0.50 mg Th(IV) in 3: 1 dioxan: water medium as 1: 1 complex having orange red colour with absorption maximum at 419 nm, at pH 4.5–6.0. For the estimation of9.6 ppm Th(IV) 100-folds acetate, citrate, tartrate; 50 ppm UO2 2+, 75 ppm Ce3+, La3+, Gd3+; 4.5 ppm Ce4+; 25 ppm Tm3+, Zr4+; and 100 ppm Ti4+, V5+, MoO4 2− and WO4 2− do not interfere.
    Type of Medium: Electronic Resource
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