HAVEL, Josef, Julio Arturo SOTO-GUERRERO and Přemysl LUBAL. Spectrophtometric Study of Uranyl-oxalate Complexation in Solution. Polyhedron. Velká Británie: Elsevier Science Ltd., 2002, vol. 21, 14-15, p. 1411-1420. ISSN 0277-5387.
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Basic information
Original name Spectrophtometric Study of Uranyl-oxalate Complexation in Solution
Authors HAVEL, Josef (203 Czech Republic, guarantor), Julio Arturo SOTO-GUERRERO (484 Mexico) and Přemysl LUBAL (203 Czech Republic).
Edition Polyhedron, Velká Británie, Elsevier Science Ltd. 2002, 0277-5387.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10406 Analytical chemistry
Country of publisher United Kingdom of Great Britain and Northern Ireland
Confidentiality degree is not subject to a state or trade secret
Impact factor Impact factor: 1.414
RIV identification code RIV/00216224:14310/02:00008579
Organization unit Faculty of Science
Keywords in English Uranyl oxalates; Oxalic acid; UV/VIS spectrophotometry; Speciation; Stability Constants; Aqeous solutions
Tags Aqeous solutions, Oxalic acid, Speciation, Stability Constants, Uranyl oxalates, UV/VIS spectrophotometry
Changed by Changed by: prof. RNDr. Josef Havel, DrSc., učo 1796. Changed: 2/6/2003 14:00.
Abstract
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.
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MSM 143100011, plan (intention)Name: Struktura a vazebné poměry, vlastnosti a analýza syntetických a přírodních molekulových ansamblů
Investor: Ministry of Education, Youth and Sports of the CR, Structure and character of bonding, properties and analysis of synthetic and natural molecular ensembles
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