Gibbs energies of formation of hydroxides of lanthanides and yttrium

Чиркст, Д. Э.; Lobacheva, O. L.; Berlinskii, I. V.

doi:10.1134/s003602441012006x

Cited by 18 publications

(14 citation statements)

References 3 publications

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“…Saturation of solutions is impossible, when solubility product (SP) for sulfide La (10 -26.3 by [9]) keeps minimum and its activities product (AP) (on the average is 10 -34 ) keeps maximum. Therefore, the absence of a pronounced positive Ce anomaly in the waters with reducing conditions (with 3 + oxidation state) can be explained by the formation of poorly soluble hydroxide Се(ОН)3 (SP = 6.4310 -26.4 by [10]). In the oxidizing conditions stability of cerium in the waters can be controlled by hydroxide Ce(OH)4; its formation is possible for all lakes (AP is 10 -41 and SP is 1.610 -55 the same link).…”

Section: Resultsmentioning

confidence: 99%

REE in waters and bottom sediments of salt lakes of Southeastern Transbaikalia, Russia

Борзенко

Замана

2019

E3S Web Conf.

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This paper presents our analysis of the distribution of REE in mineral chloride and soda lakes of Southeastern Transbaikalia. With increasing water salinity, it was determined that concentrations of dissolved HREE increased. The prevalence in absolute concentrations of MREE and HREE was observed in lakes with the development of bacterial processes (sulfate-reduction). A geochemical barrier for accumulating the LREE in the waters can be fluoro-carbonates. The saturation degree of fluorcarbonates in soda lakes can be several orders higher than in chloride lakes. Under oxidizing conditions Ce(OH)4 can be formed and, in a reducing environment – Ce(OH)3.

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Section: Resultsmentioning

confidence: 99%

REE in waters and bottom sediments of salt lakes of Southeastern Transbaikalia, Russia

Борзенко

Замана

2019

E3S Web Conf.

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“…Yttrium recovery in the absence of chloride ions at maximum recovery рН of 6.9 occurs in a form of YOH(DS) 2 , and at chloride concentrations of 0.01 M in a form of Y(OH) 3 6.6 [Chirkst et al 2009c]. In the range of maximum recovery The influence of chloride ions on the distribution coefficient was explained by comparing chloro and hydroxo complexes instability constants ( Table 2).…”

Section: Resultsmentioning

confidence: 99%

The Method of Removal Yttrium (Iii) and Ytterbium (Iii) From Dilute Aqueous Solutions

Lobacheva¹,

Dzhevaga²,

Danilov³

2016

J. Ecol. Eng.

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Yttrium (III) and ytterbium (III) cations ion flotation from diluted aqueous solutions in the presence of chloride ions using sodium dodecyl sulfate as collector agent were studied. Y (III) and Yb (III) distribution and recovery coefficients as a function of aqueous phase рН value at different sodium chloride concentrations were received. Yttrium (III) and ytterbium (III) chloro and hydroxo complexes instability constants were calculated. The calculation of separation coefficient at рН specified values depending on chloride ion concentration was conducted. Maximum separation coefficient was observed when chloride concentration of 0.01 M is 50 at рН 7.8. K sep is minimal in nitrate medium ans is 3 at рН 7.0. At sodium chloride concentration of 0.05 М K sep is 9 at рН 7.8.

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“…The solubility of Eu(OH) 3 (s) has been investigated in several literatures [4,15,16,18,24,25,[39][40][41][42]. Akselrud and Ermolenko [18] observed starting points of precipitation by adding NaOH solutions to Eu solution in certain concentrations.…”

Section: Eu Solubilities Measured At 25 °C After Aging At 25 Tomentioning

confidence: 99%

“…The solubility products at T meas = 25 °C were determined to be log K s° = 18.4±0.2 for Eu 2 O 3 (cr), and log K s° = 17.2±0.3 for Eu(OH) 3 (cr). In literatures, a number of log K s° for Eu(OH) 3 (cr) has been reported [15,16,18,25,[39][40][41][42], while no log K s° value for Eu 2 O 3 (cr). The obtained log K s° for Eu(OH) 3 (cr) in the present study was slightly higher than the reported values and the selected one of log K s° = 16.48±0.30 in [4].…”

Section: Solubility Product Of Ln 2 O 3 (Cr) and Ln(oh) 3 (Cr) At T Mmentioning

confidence: 99%

Solubility and solid phase of trivalent lanthanide hydroxides and oxides

Moniruzzaman

Kobayashi

Sasaki

2020

J. Nucl. Radiochem. Sci.

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An undersaturation approach was adopted to reveal the solubility and solubility-limiting solid phase of La, Eu and Tm in the sample solutions with the ionic strength (I) of 0.1 mol/L (M) and the hydrogen ion concentration range (pH c =-log [H + ]) of 6 to 12 after aging at 25 to 90°C for certain periods up to 12 weeks. Solubility and solubilitylimiting solid phases were discussed with the aid of X-ray diffraction (XRD) patterns of the solid phases and temperature dependence of solubility products (log K s°) values. The XRD patterns of the solid phases indicated that the initial solid phase of La 2 O 3 (cr) transformed to La(OH) 3 (cr) after aging at 25 °C and 90 °C. On the other hand, Eu 2 O 3 (cr) remained stable after aging at 25 °C, but after 90 °C, converted to Eu(OH) 3 (cr). It was observed that Tm 2 O 3 (cr) was not transformed after aging at both 25 °C or 90 °C. Thermodynamic properties obtained from the temperature dependence of the solubility products agreed well with the observations in the XRD patterns.

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Gibbs energies of formation of hydroxides of lanthanides and yttrium

Cited by 18 publications

References 3 publications

REE in waters and bottom sediments of salt lakes of Southeastern Transbaikalia, Russia

REE in waters and bottom sediments of salt lakes of Southeastern Transbaikalia, Russia

The Method of Removal Yttrium (Iii) and Ytterbium (Iii) From Dilute Aqueous Solutions

Solubility and solid phase of trivalent lanthanide hydroxides and oxides

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