Spectrophotometric Study of Uranyl-Oxalate System : Are there polynuclear species formed in solution ?

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F01%3A00008552" target="_blank" >RIV/00216224:14310/01:00008552 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Spectrophotometric Study of Uranyl-Oxalate System : Are there polynuclear species formed in solution ?

Popis výsledku v původním jazyce

Uranyl-oxalate complex equilibria in aqueous solution were studied by UV-Vis spectrophotometry. Due to high spectra correlation, derivative spectrophotometry was also applied during the search for the best chemical model. Absorption spectra of all the complexes were calculated and found in a good agreement with theoretical considertions. 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 K1 = 3.83 +/- 0.01; log K2 = 4.92 +/- 0.01. Stability constants determined for the (UO2)p(C2O4)q 2p-2q species were: log Beta11 = 6.31 +/- 0.02, log Beta12 = 11.21 +/- 0.07, log Beta13 = 13.8 +/- 0.04, log Beta23 = 18.5 +/- 0.2, log Beta25 = 28.5 +/- 0.1 (I = 3.0 M NaClO4; 298.2 K). The equilibrium constants were extrapolated to infinite dilution by applying Specific ion Interaction Theory (SIT) and are the following: log Beta11 = 7.41 +/- 0.01, log

Název v anglickém jazyce

Spectrophotometric Study of Uranyl-Oxalate System : Are there polynuclear species formed in solution ?

Popis výsledku anglicky

Uranyl-oxalate complex equilibria in aqueous solution were studied by UV-Vis spectrophotometry. Due to high spectra correlation, derivative spectrophotometry was also applied during the search for the best chemical model. Absorption spectra of all the complexes were calculated and found in a good agreement with theoretical considertions. 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 K1 = 3.83 +/- 0.01; log K2 = 4.92 +/- 0.01. Stability constants determined for the (UO2)p(C2O4)q 2p-2q species were: log Beta11 = 6.31 +/- 0.02, log Beta12 = 11.21 +/- 0.07, log Beta13 = 13.8 +/- 0.04, log Beta23 = 18.5 +/- 0.2, log Beta25 = 28.5 +/- 0.1 (I = 3.0 M NaClO4; 298.2 K). The equilibrium constants were extrapolated to infinite dilution by applying Specific ion Interaction Theory (SIT) and are the following: log Beta11 = 7.41 +/- 0.01, log

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CB - Analytická chemie, separace

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2001

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Polyhedron

ISSN

0277-5387

e-ISSN

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Svazek periodika

21

Číslo periodika v rámci svazku

14-15

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

10

Strana od-do

1411-1420

Kód UT WoS článku

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EID výsledku v databázi Scopus

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