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.
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.
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References
D. I. Ryabchikov andE. K. Gol'braith, The Analytical Chemistry of Thorium. New York: Pergamon. 1963.
F. S. Grimaldi, Thorium, in:I. M. Kolthoff andP. J. Elving (eds.), Treatise on Analytical Chemistry, Vol. 5, pp. 139 to 216. New York: Interscience. 1963.
G.S. Manku, R. D. Gupta, A. N. Bhat andB. D. Jain, Mikrochim. Acta [Wien] 1970, 836.
R. Anschütz, Ann. Chem.367, 169 (1909).
F. J. Welcher, Organic Analytical Reagents. New York: Van Nostrand. 1947.
W. C. Yosburgh andG. R. Cooper, J. Amer. Chem. Soc.63, 437 (1941).
A. E. Harvey andD. L. Manning, J. Amer. Chem. Soc.72, 4488 (1950).
E. Asmus, Z. analyt. Chem.178, 104 (1960).
R. G. Anderson andG. Nickless, Analyt. Chim. Acta39, 469 (1967).
R. T. Foley andR. C. Anderson, J. Amer. Chem. Soc.71, 909 (1949).
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Manku, G.S. Spectrophotometric determination of thorium(IV) using 3-nitroso-4-hydroxycoumarin. Mikrochim Acta 60, 811–817 (1972). https://doi.org/10.1007/BF01239147
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DOI: https://doi.org/10.1007/BF01239147