Uranium(VI) solubility in carbonate-free WIPP brine
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J. F. Lucchini
Abstract
The solubility of uranium(VI) was determined in WIPP-relevant brines as a function of pCH+ and ionic strength, in the absence of carbonate. Carbonate concentration was below 2 × 105 M, measured using the gas chromatography method. In the absence of carbonate, the uranium(VI) solubilities were about × 106 M in GWB at pCH+≥7 and about × 108– × 107 M in ERDA-6 brine at pCH+≥8. Solubility of uranium(VI) was also measured in NaCl media at the same levels as in ERDA-6 brine. The data established a uranium solubility that was 10–100 times lower than published results from Diaz-Arocas and Grambow [13], and they are in good agreement with modeling results and other literature data [11,12]. In the absence of carbonate, hydrolysis was the main complexation and precipitation mechanisms for uranium(VI) solubility at high ionic strength and pCH+≥7. However, the effect of borate complexation was noticeable at pCH+∼8–9.
© by Oldenbourg Wissenschaftsverlag, München, Germany
Artikel in diesem Heft
- Preface
- Analytical tools for speciation in the field of toxicology
- Solution thermodynamic evaluation of hydroxypyridinonate chelators 3,4,3-LI(1,2-HOPO) and 5-LIO(Me-3,2-HOPO) for UO2(VI) and Th(IV) decorporation
- Short note on the hydrolysis and complexation of neptunium(IV) in HEPES solution
- Contribution of extraction isotherms modeling based on the Mikulin–Sergievskii–Dannus approach to the speciation of plutonium(IV) in TBP 30 %/dodecane
- EXAFS investigation on U(VI) immobilization in hardened cement paste: influence of experimental conditions on speciation
- Uranium(VI) solubility in carbonate-free WIPP brine
Artikel in diesem Heft
- Preface
- Analytical tools for speciation in the field of toxicology
- Solution thermodynamic evaluation of hydroxypyridinonate chelators 3,4,3-LI(1,2-HOPO) and 5-LIO(Me-3,2-HOPO) for UO2(VI) and Th(IV) decorporation
- Short note on the hydrolysis and complexation of neptunium(IV) in HEPES solution
- Contribution of extraction isotherms modeling based on the Mikulin–Sergievskii–Dannus approach to the speciation of plutonium(IV) in TBP 30 %/dodecane
- EXAFS investigation on U(VI) immobilization in hardened cement paste: influence of experimental conditions on speciation
- Uranium(VI) solubility in carbonate-free WIPP brine
