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@article{483373,
author = {Havel, Josef and SotoandGuerrero, Julio Arturo and Lubal, Přemysl},
article_location = {Velká Británie},
article_number = {14-15},
keywords = {Uranyl oxalates; Oxalic acid; UV/VIS spectrophotometry; Speciation; Stability Constants; Aqeous solutions},
language = {eng},
issn = {0277-5387},
journal = {Polyhedron},
title = {Spectrophtometric Study of Uranyl-oxalate Complexation in Solution},
volume = {21},
year = {2002}
}
TY - JOUR
ID - 483373
AU - Havel, Josef - Soto-Guerrero, Julio Arturo - Lubal, Přemysl
PY - 2002
TI - Spectrophtometric Study of Uranyl-oxalate Complexation in Solution
JF - Polyhedron
VL - 21
IS - 14-15
SP - 1411
EP - 1411
PB - Elsevier Science Ltd.
SN - 02775387
KW - Uranyl oxalates
KW - Oxalic acid
KW - UV/VIS spectrophotometry
KW - Speciation
KW - Stability Constants
KW - Aqeous solutions
N2 - Uranyl-oxalate complex equilibrium in aqueous solution was studied by UV-Vis spectrophotometry. Due to high spectra correlation, derivative spectrophotometry was also applied during the search for the best chemical model. The absorption spectra of all the complexes were calculated and found in a good agreement with theoretical considerations. Overall protonation constants of oxalate, necessary for accurate calculation of uranyl-oxalate formation constants, were also determined under the same conditions and the following values were obtained log Beta_p_1 = 3.83 +/- 0.01; log Beta_p_2 = 4.92 +/- 0.01. Stability constants determined for the [(UO2)(p),(C2O4)(q)](2p-2q) species were: log beta(11) = 6.31 +/- 0.02, log beta(12) = 11.21 +/- 0.07, log beta(13) = 13.8 +/- 0.04, log beta(23) = 18.5 +/- 0.2, log beta(25) = 28.5 +/- 0.1 (I = 3.0 M NaClO4; 25 degreesC). The equilibrium constants were extrapolated to infinite dilution by applying specific ion interaction theory (SIT) and are the following: log beta(11)(0) = 7.41 +/- 0.01, log beta(12)(0) = 11.80 +/- 0.02, log beta(13) (0) = 13.96 +/- 0.07. Formation of polynuclear [(UO2)(2)(C2O4)(3)](2-) and [(UO(2))(2)(C2O4)(5)](6-) species was proved and confirmed independently by conductometry and vapor pressure osmometry.
ER -
HAVEL, Josef, Julio Arturo SOTO-GUERRERO a Přemysl LUBAL. Spectrophtometric Study of Uranyl-oxalate Complexation in Solution. \textit{Polyhedron}. Velká Británie: Elsevier Science Ltd., 2002, roč.~21, 14-15, s.~1411-1420. ISSN~0277-5387.
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