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Title: Supercritical Fluid Extraction of Plutonium and Americium from Soil using Thenoyltrifluoroacetone and Tributylphosphate Complexation

Abstract

Samples of clean soil from the source used to backfill pits at the Idaho National Engineering and Environmental Laboratory's Radioactive Waste Management Complex were spiked with Pu-239 and Am-241 to evaluate ligand-assistedsupercritical fluid extraction as a decontamination method. The actual soil in the pits has been subject to approximately three decades of weatheringsince it was originally contaminated. No surrogate soil can perfectly simulate the real event, but actual contaminated soil was not available for research purposes. However, fractionation of Am and Pu in the surrogate soil was found to be similar to that previously measured in the real soil using asequential aqueous extraction procedure. This suggests that Pu and Am behavior are similar in the two soils. The surrogate was subjected to supercritical carbon dioxide extraction, in the presence of the fluorinated beta diketone thenoyltrifluoroacetone (TTA), and tributylphosphate (TBP). As much as 69% of the Pu and 88% of the Am were removed from the soil using 3.2mol% TTA and 2.7 mol % TBP, in a single 45 minute extraction. Extraction conditions employing a 5 mol % ethanol modifier with 0.33 mol % TTA and 0.27 mol %TBP resulted in 66% Pu and 68% Am extracted. To our knowledge, thismore » is thefirst report of the use of supercritical fluid extraction (SFE) for the removal of actinides from soil.« less

Authors:
; ; ; ;
Publication Date:
Research Org.:
Idaho National Laboratory (INL)
Sponsoring Org.:
USDOE
OSTI Identifier:
912117
Report Number(s):
INEEL/JOU-00-00904
DOE Contract Number:  
DE-AC07-99ID-13727
Resource Type:
Journal Article
Journal Name:
Radiochimica Acta
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
99 - GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; americium; plutonium; soil; supercritical fluid extraction

Citation Formats

Mincher, Bruce Jay, Fox, Robert Vincent, Holmes, R, Robbins, R, and Boardman, C. Supercritical Fluid Extraction of Plutonium and Americium from Soil using Thenoyltrifluoroacetone and Tributylphosphate Complexation. United States: N. p., 2001. Web. doi:10.1524/ract.2001.89.10.613.
Mincher, Bruce Jay, Fox, Robert Vincent, Holmes, R, Robbins, R, & Boardman, C. Supercritical Fluid Extraction of Plutonium and Americium from Soil using Thenoyltrifluoroacetone and Tributylphosphate Complexation. United States. doi:10.1524/ract.2001.89.10.613.
Mincher, Bruce Jay, Fox, Robert Vincent, Holmes, R, Robbins, R, and Boardman, C. Mon . "Supercritical Fluid Extraction of Plutonium and Americium from Soil using Thenoyltrifluoroacetone and Tributylphosphate Complexation". United States. doi:10.1524/ract.2001.89.10.613.
@article{osti_912117,
title = {Supercritical Fluid Extraction of Plutonium and Americium from Soil using Thenoyltrifluoroacetone and Tributylphosphate Complexation},
author = {Mincher, Bruce Jay and Fox, Robert Vincent and Holmes, R and Robbins, R and Boardman, C},
abstractNote = {Samples of clean soil from the source used to backfill pits at the Idaho National Engineering and Environmental Laboratory's Radioactive Waste Management Complex were spiked with Pu-239 and Am-241 to evaluate ligand-assistedsupercritical fluid extraction as a decontamination method. The actual soil in the pits has been subject to approximately three decades of weatheringsince it was originally contaminated. No surrogate soil can perfectly simulate the real event, but actual contaminated soil was not available for research purposes. However, fractionation of Am and Pu in the surrogate soil was found to be similar to that previously measured in the real soil using asequential aqueous extraction procedure. This suggests that Pu and Am behavior are similar in the two soils. The surrogate was subjected to supercritical carbon dioxide extraction, in the presence of the fluorinated beta diketone thenoyltrifluoroacetone (TTA), and tributylphosphate (TBP). As much as 69% of the Pu and 88% of the Am were removed from the soil using 3.2mol% TTA and 2.7 mol % TBP, in a single 45 minute extraction. Extraction conditions employing a 5 mol % ethanol modifier with 0.33 mol % TTA and 0.27 mol %TBP resulted in 66% Pu and 68% Am extracted. To our knowledge, this is thefirst report of the use of supercritical fluid extraction (SFE) for the removal of actinides from soil.},
doi = {10.1524/ract.2001.89.10.613},
journal = {Radiochimica Acta},
number = 10,
volume = 89,
place = {United States},
year = {2001},
month = {10}
}