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Title: Sorption testing and generalized composite surface complexation models for determining uranium sorption parameters at a proposed in-situ recovery site

Abstract

Solid-phase iron concentrations and generalized composite surface complexation models were used to evaluate procedures in determining uranium sorption on oxidized aquifer material at a proposed U in situ recovery (ISR) site. At the proposed Dewey Burdock ISR site in South Dakota, USA, oxidized aquifer material occurs downgradient of the U ore zones. Solid-phase Fe concentrations did not explain our batch sorption test results,though total extracted Fe appeared to be positively correlated with overall measured U sorption. Batch sorption test results were used to develop generalized composite surface complexation models that incorporated the full genericsorption potential of each sample, without detailed mineralogiccharacterization. The resultant models provide U sorption parameters (site densities and equilibrium constants) for reactive transport modeling. The generalized composite surface complexation sorption models were calibrated to batch sorption data from three oxidized core samples using inverse modeling, and gave larger sorption parameters than just U sorption on the measured solidphase Fe. These larger sorption parameters can significantly influence reactive transport modeling, potentially increasing U attenuation. Because of the limited number of calibration points, inverse modeling required the reduction of estimated parameters by fixing two parameters. The best-fit models used fixed values for equilibrium constants, with the sorption site densitiesmore » being estimated by the inversion process. While these inverse routines did provide best-fit sorption parameters, local minima and correlated parameters might require further evaluation. Despite our limited number of proxy samples, the procedures presented provide a valuable methodology to consider for sites where metal sorption parameters are required. Furthermore, these sorption parameters can be used in reactive transport modeling to assess downgradient metal attenuation, especially when no other calibration data are available, such as at proposed U ISR sites.« less

Authors:
 [1];  [2];  [3];  [2]
+ Show Author Affiliations
  1. U.S. Department of Energy, Grand Junction, CO (United States). Office of Legacy Management.
  2. South Dakota School of Mines and Technology, Rapid City, SD (United States)
  3. U.S. Navy, Washington, D.C. (United States). Naval Nuclear Power Pipeline.
Publication Date:
Research Org.:
US Department of Energy (USDOE), Washington DC (United States). Office of Legacy Management (LM)
Sponsoring Org.:
USDOE Office of Legacy Management (LM), Office of Site Operations
OSTI Identifier:
1253174
Grant/Contract Number:  
LM0000421
Resource Type:
Accepted Manuscript
Journal Name:
Mine Water and the Environment
Additional Journal Information:
Journal Volume: 25; Journal Issue: 2-3; Journal ID: ISSN 1025-9112
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; geochemical modeling; batch sorption; PHREEQC; PEST

Citation Formats

Johnson, Raymond H., Truax, Ryan A., Lankford, David A., and Stone, James J. Sorption testing and generalized composite surface complexation models for determining uranium sorption parameters at a proposed in-situ recovery site. United States: N. p., 2016. Web. doi:10.1007/s10230-016-0384-6.
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Johnson, Raymond H., Truax, Ryan A., Lankford, David A., & Stone, James J. Sorption testing and generalized composite surface complexation models for determining uranium sorption parameters at a proposed in-situ recovery site. United States. https://doi.org/10.1007/s10230-016-0384-6
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Johnson, Raymond H., Truax, Ryan A., Lankford, David A., and Stone, James J. Wed . "Sorption testing and generalized composite surface complexation models for determining uranium sorption parameters at a proposed in-situ recovery site". United States. https://doi.org/10.1007/s10230-016-0384-6. https://www.osti.gov/servlets/purl/1253174.
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@article{osti_1253174,
title = {Sorption testing and generalized composite surface complexation models for determining uranium sorption parameters at a proposed in-situ recovery site},
author = {Johnson, Raymond H. and Truax, Ryan A. and Lankford, David A. and Stone, James J.},
abstractNote = {Solid-phase iron concentrations and generalized composite surface complexation models were used to evaluate procedures in determining uranium sorption on oxidized aquifer material at a proposed U in situ recovery (ISR) site. At the proposed Dewey Burdock ISR site in South Dakota, USA, oxidized aquifer material occurs downgradient of the U ore zones. Solid-phase Fe concentrations did not explain our batch sorption test results,though total extracted Fe appeared to be positively correlated with overall measured U sorption. Batch sorption test results were used to develop generalized composite surface complexation models that incorporated the full genericsorption potential of each sample, without detailed mineralogiccharacterization. The resultant models provide U sorption parameters (site densities and equilibrium constants) for reactive transport modeling. The generalized composite surface complexation sorption models were calibrated to batch sorption data from three oxidized core samples using inverse modeling, and gave larger sorption parameters than just U sorption on the measured solidphase Fe. These larger sorption parameters can significantly influence reactive transport modeling, potentially increasing U attenuation. Because of the limited number of calibration points, inverse modeling required the reduction of estimated parameters by fixing two parameters. The best-fit models used fixed values for equilibrium constants, with the sorption site densities being estimated by the inversion process. While these inverse routines did provide best-fit sorption parameters, local minima and correlated parameters might require further evaluation. Despite our limited number of proxy samples, the procedures presented provide a valuable methodology to consider for sites where metal sorption parameters are required. Furthermore, these sorption parameters can be used in reactive transport modeling to assess downgradient metal attenuation, especially when no other calibration data are available, such as at proposed U ISR sites.},
doi = {10.1007/s10230-016-0384-6},
journal = {Mine Water and the Environment},
number = 2-3,
volume = 25,
place = {United States},
year = {Wed Feb 03 00:00:00 EST 2016},
month = {Wed Feb 03 00:00:00 EST 2016}
}
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Publisher's Version of Record
https://doi.org/10.1007/s10230-016-0384-6
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