Thermodynamics and laser luminescence spectroscopy of binary and ternary complexation of Am3+, Cm3+ and Eu3+ with citric acid, and citric acid plus EDTA at high ionic strength

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F07%3A00152291" target="_blank" >RIV/68407700:21340/07:00152291 - isvavai.cz</a>

Výsledek na webu

<a href="http://ees.elsevier.com/ica/" target="_blank" >http://ees.elsevier.com/ica/</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ica.2006.01.046" target="_blank" >10.1016/j.ica.2006.01.046</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermodynamics and laser luminescence spectroscopy of binary and ternary complexation of Am3+, Cm3+ and Eu3+ with citric acid, and citric acid plus EDTA at high ionic strength

Popis výsledku v původním jazyce

The binary complexation of Am3+, Cm3+ and Eu3+ with citrate has been studied at I = 6.60 m (NaClO4), pcH 3.60 and in the temperatures range of 0-60 degrees C employing a solvent extraction technique with di-(2-ethylhexyl) phosphoric acid/heptane. Two complexes, MCit and MCit(2)(3-), were formed at all temperatures. For the three metal ions, the log beta(101) was between 5.9 and 6.2 and 100102 between 10.2 and 10.6 at 25 degrees C. The thermodynamic parameters for the Am-Cit system have been calculated from the temperature dependence of the beta(101) and beta(102) values. Positive enthalpy and entropy values for the formation of both complexes are interpreted as due to the contributions from the dehydration of the metal ions exceeding the exothermic cation-anion pairing. The formation of the ternary complex M(EDTA)(Cit)(4-) (M = Cm and Eu) was measured to have large stability constants (log beta(111) between 20.9 and 24.4) at 25 and 60 degrees C.

Název v anglickém jazyce

Thermodynamics and laser luminescence spectroscopy of binary and ternary complexation of Am3+, Cm3+ and Eu3+ with citric acid, and citric acid plus EDTA at high ionic strength

Popis výsledku anglicky

The binary complexation of Am3+, Cm3+ and Eu3+ with citrate has been studied at I = 6.60 m (NaClO4), pcH 3.60 and in the temperatures range of 0-60 degrees C employing a solvent extraction technique with di-(2-ethylhexyl) phosphoric acid/heptane. Two complexes, MCit and MCit(2)(3-), were formed at all temperatures. For the three metal ions, the log beta(101) was between 5.9 and 6.2 and 100102 between 10.2 and 10.6 at 25 degrees C. The thermodynamic parameters for the Am-Cit system have been calculated from the temperature dependence of the beta(101) and beta(102) values. Positive enthalpy and entropy values for the formation of both complexes are interpreted as due to the contributions from the dehydration of the metal ions exceeding the exothermic cation-anion pairing. The formation of the ternary complex M(EDTA)(Cit)(4-) (M = Cm and Eu) was measured to have large stability constants (log beta(111) between 20.9 and 24.4) at 25 and 60 degrees C.

Druh

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

CEP obor

CH - Jaderná a kvantová chemie, fotochemie

OECD FORD obor

—

Projekt

<a href="/cs/project/1K04120" target="_blank" >1K04120: Studium forem existence radiohygienicky významných radionuklidů pomocí TRLIFS</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2007

Kód důvěrnosti údajů

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

Název periodika

INORGANICA CHIMICA ACTA

ISSN

0020-1693

e-ISSN

—

Svazek periodika

360

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

7

Strana od-do

1785-1791

Kód UT WoS článku

000246537900001

EID výsledku v databázi Scopus

—