ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Spectrophotometric and Potentiometrie Study of Uranyl Hydrolysis in Perchlorate Medium. Is Derivative Spectrophotometry Suitable for Search of the Chemical Model?

P. Lubal and J. Havel

Department, of Analytical Chemistry, Faculty of Science, Masaryk University, CZ-611 SI Brno

Abstract: Uranyl hydrolysis (I = 3.00 mol dm^-3 NaClO₄, T = 298.15 K) was studied by potentiometry and spectrophotometry. Numerical analysis of experimental data yielded the logarithmic values of hydrolytic constants for (UO₂)_p(OH)_q^(2p-q)+ species with (p, q) indices: (2, 2) -6.24 +/- 0.02, (3, 5) -16.80 +/- 0.04, and (3, 4) -12.8 +/- 0.1 (potentiometry) and (2, 2) -6.13 +/- 0.02, (3, 5) -16.81 +/- 0.02, and (3, 4) -12.57 +/- 0.02 (average values obtained by derivative spectrophotometry from the first to the fourth order). The spectra of hydrolytic species were deconvoluted and the use of derivative spectrophotometry in equilibria studies has been discussed.

Full paper in Portable Document Format: 514a213.pdf

Chemical Papers 51 (4) 213–220 (1997)