Abstract
The reactions of uranium(VI) and thorium(IV) ions with carminic acid have been investigated. These ions react with carminic acid in neutral medium, forming colored complexes. The dark purple or red wine complexes show a high absorption in the visible region (597 nm U(VI) and 616 nm Th(IV)). Chemical variables that affect the reaction have been optimized. The spectral overlapping of the color of complexes has been resolved by first-derivative spectrophotometry. The simultaneous determination of uranium(VI) and thorium(IV) mixtures is accomplished by taking the derivative signal (“zero crossing”) at 597 nm for U(VI) determination and at 616 nm for Th(IV) determination, respectively. The method has been applied to Tyuyamonite ore, containing in the matrix both ions.
Similar content being viewed by others
References
G. Troll, A. Sanerver,Analyst, 110 (3) (1985) 283.
L. López-Martínez, et al.,Rev. Soc. Quim, Mex., 34(5) (1990) 258.
P.L. López-de-Alba, et al.,Rev. Soc. Quim. Mex., 31 (6) (1987) 306.
N.S. Poluktov, R.S. Lauer, M.A. Sandu,Zh. Anal. Khim., 25(4) (1970) 2118.Chem. Abstr., 74(12): 60525n.
B. Morelli,Analyst, 108 (1983) 1506.
B. Morelli,Anal. Letter, 18 (1985) 2453.
F. Salinas, et al.,Analyst, 112 (1987) 1391.
F. Salinas, et al.,Analyst, 113 (1988) 1439.
F. Salinas, J.J. Berzas-Nevado, M.I. Acedo,Anales de Química, 86 (1990) 413.
R. Kuroda, et al.,Talanta, 37(6) (1990) 619.
A. Savitzky, M.J.E. Golay,Anal. Chem., 36 (1964) 1627.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
López-de-Alba, P.L., López-Martínez, L. Simultaneous determination of uranium(VI) and thorium(IV) with carminic acid by derivative spectrophotometry. Journal of Radioanalytical and Nuclear Chemistry Letters 164, 309–319 (1992). https://doi.org/10.1007/BF02164954
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02164954