Journal article
Solubility and Thermodynamic Investigation of Meta-Autunite Group Uranyl Arsenate Solids with Monovalent Cations Na and K
Environmental science & technology, Vol.57(1), pp.255-265
01/10/2023
DOI: 10.1021/acs.est.2c06648
PMCID: PMC10039619
PMID: 36525634
Abstract
We investigated the aqueous solubility and thermodynamic properties of two meta-autunite group uranyl arsenate solids (UAs). The measured solubility products (log
) obtained in dissolution and precipitation experiments at equilibrium pH 2 and 3 for NaUAs and KUAs ranged from -23.50 to -22.96 and -23.87 to -23.38, respectively. The secondary phases (UO
)(H
AsO
)
(H
O)
and trögerite, (UO
)
(AsO
)
·12H
O
, were identified by powder X-ray diffraction in the reacted solids of KUA precipitation experiments (pH 2) and NaUAs dissolution and precipitation experiments (pH 3), respectively. The identification of these secondary phases in reacted solids suggest that H
O
co-occurring with Na or K in the interlayer region can influence the solubilities of uranyl arsenate solids. The standard-state enthalpy of formation from the elements (Δ
) of NaUAs is -3025 ± 22 kJ mol
and for KUAs is -3000 ± 28 kJ mol
derived from measurements by drop solution calorimetry, consistent with values reported in other studies for uranyl phosphate solids. This work provides novel thermodynamic information for reactive transport models to interpret and predict the influence of uranyl arsenate solids on soluble concentrations of U and As in contaminated waters affected by mining legacy and other anthropogenic activities.
Details
- Title: Subtitle
- Solubility and Thermodynamic Investigation of Meta-Autunite Group Uranyl Arsenate Solids with Monovalent Cations Na and K
- Creators
- Isabel Meza - Center for Water and the Environment, UNM, Albuquerque, New Mexico87131, United StatesJorge Gonzalez-Estrella - Oklahoma State UniversityPeter C Burns - University of Notre DameVirginia Rodriguez - University of Notre DameCarmen A Velasco - Center for Water and the Environment, UNM, Albuquerque, New Mexico87131, United StatesGinger E Sigmon - University of Notre DameJennifer E S Szymanowski - University of Notre DameTori Z Forbes - University of IowaLindsey M Applegate - Department of Chemistry, University of Iowa, Iowa City, Iowa52242, United StatesAbdul-Mehdi S Ali - Department of Earth and Planetary Sciences, MSC03 2040, University of New Mexico, Albuquerque, New Mexico87131, United StatesPeter Lichtner - Center for Water and the Environment, UNM, Albuquerque, New Mexico87131, United StatesJosé M Cerrato - Center for Water and the Environment, UNM, Albuquerque, New Mexico87131, United States
- Resource Type
- Journal article
- Publication Details
- Environmental science & technology, Vol.57(1), pp.255-265
- DOI
- 10.1021/acs.est.2c06648
- PMID
- 36525634
- PMCID
- PMC10039619
- NLM abbreviation
- Environ Sci Technol
- ISSN
- 0013-936X
- eISSN
- 1520-5851
- Grant note
- DOI: 10.13039/100000066, name: National Institute of Environmental Health Sciences, award: 1P42ES025589, R01ES027145; DOI: 10.13039/100006151, name: Basic Energy Sciences, award: DE-FG0207ER15880; DOI: 10.13039/100000001, name: National Science Foundation, award: 1652619, 1914490
- Language
- English
- Electronic publication date
- 12/16/2022
- Date published
- 01/10/2023
- Academic Unit
- Civil and Environmental Engineering; Core Research Facilities; Chemistry
- Record Identifier
- 9984339458802771
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