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@article{485231, author = {Havel, Josef and SotoandGuerrero, Julio Arturo and Lubal, Přemysl}, article_location = {OXFORD}, article_number = {14-15}, keywords = {Spectrophotometric study; uranyl-oxalate; complexation in solution}, language = {eng}, issn = {0277-5387}, journal = {POLYHEDRON}, title = {Spectrophotometric study of uranyl-oxalate complexation in solution}, volume = {21}, year = {2002} }
TY - JOUR ID - 485231 AU - Havel, Josef - Soto-Guerrero, Julio Arturo - Lubal, Přemysl PY - 2002 TI - Spectrophotometric study of uranyl-oxalate complexation in solution JF - POLYHEDRON VL - 21 IS - 14-15 SP - 1411-1420 EP - 1411-1420 PB - PERGAMON-ELSEVIER SCIENCE LTD SN - 02775387 KW - Spectrophotometric study KW - uranyl-oxalate KW - complexation in solution 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 K-1 = 3.83 +/- 0.01; log K-2 = 4.92 +/- 0.01. Stability constants determined for the [(UO2),(C2O4)(q)](2p-2q) species were: log beta(11) = 6.31 +/- 0.02, 109 +/- 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. (C) 2002 Published by Elsevier Science Ltd. ER -
HAVEL, Josef, Julio Arturo SOTO-GUERRERO a Přemysl LUBAL. Spectrophotometric study of uranyl-oxalate complexation in solution. \textit{POLYHEDRON}. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD, 2002, roč.~21, 14-15, s.~1411-1420. ISSN~0277-5387.
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