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Title: Tributylphosphate Extraction Behavior of Bismuthate-Oxidized Americium

Abstract

Higher oxidation states of americium have long been known; however, options for their preparation in acidic solution are limited. The conventional choice, silver-catalyzed peroxydisulfate, is not useful at nitric acid concentrations above about 0.3 M. We investigated the use of sodium bismuthate as an oxidant for Am3+ in acidic solution. Room-temperature oxidation produced AmO2 2+ quantitatively, whereas oxidation at 80 °C produced AmO2+ quantitatively. The efficacy of the method for the production of oxidized americium was verified by fluoride precipitation and by spectroscopic absorbance measurements. We performed absorbance measurements using a conventional 1 cm cell for high americium concentrations and a 100 cm liquid waveguide capillary cell for low americium concentrations. Extinction coefficients for the absorbance of Am3+ at 503 nm, AmO2+ at 514 nm, and AmO2 2+ at 666 nm in 0.1 M nitric acid are reported. We also performed solvent extraction experiments with the hexavalent americium using the common actinide extraction ligand tributyl phosphate (TBP) for comparison to the other hexavalent actinides. Contact with 30% tributyl phosphate in dodecane reduced americium; it was nevertheless extracted using short contact times. The TBP extraction of AmO2 2+ over a range of nitric acid concentrations is shown for the first timemore » and was found to be analogous to that of uranyl, neptunyl, and plutonyl ions.« less

Authors:
; ;
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
936265
Report Number(s):
INL/JOU-06-11973
Journal ID: ISSN 0020-1669; INOCAJ; TRN: US200818%%706
DOE Contract Number:  
DE-AC07-99ID-13727
Resource Type:
Journal Article
Journal Name:
Inorganic Chemistry
Additional Journal Information:
Journal Volume: 47; Journal Issue: 15; Journal ID: ISSN 0020-1669
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACTINIDES; AMERICIUM; DODECANE; FLUORIDES; NITRIC ACID; OXIDATION; OXIDIZERS; PRECIPITATION; PRODUCTION; SODIUM; SOLVENT EXTRACTION; TBP; VALENCE; WAVEGUIDES; americium

Citation Formats

Mincher,, Martin, Leigh R, and Schmitt, Nicholas C. Tributylphosphate Extraction Behavior of Bismuthate-Oxidized Americium. United States: N. p., 2008. Web. doi:10.1021/ic800667h.
Mincher,, Martin, Leigh R, & Schmitt, Nicholas C. Tributylphosphate Extraction Behavior of Bismuthate-Oxidized Americium. United States. https://doi.org/10.1021/ic800667h
Mincher,, Martin, Leigh R, and Schmitt, Nicholas C. 2008. "Tributylphosphate Extraction Behavior of Bismuthate-Oxidized Americium". United States. https://doi.org/10.1021/ic800667h.
@article{osti_936265,
title = {Tributylphosphate Extraction Behavior of Bismuthate-Oxidized Americium},
author = {Mincher, and Martin, Leigh R and Schmitt, Nicholas C},
abstractNote = {Higher oxidation states of americium have long been known; however, options for their preparation in acidic solution are limited. The conventional choice, silver-catalyzed peroxydisulfate, is not useful at nitric acid concentrations above about 0.3 M. We investigated the use of sodium bismuthate as an oxidant for Am3+ in acidic solution. Room-temperature oxidation produced AmO2 2+ quantitatively, whereas oxidation at 80 °C produced AmO2+ quantitatively. The efficacy of the method for the production of oxidized americium was verified by fluoride precipitation and by spectroscopic absorbance measurements. We performed absorbance measurements using a conventional 1 cm cell for high americium concentrations and a 100 cm liquid waveguide capillary cell for low americium concentrations. Extinction coefficients for the absorbance of Am3+ at 503 nm, AmO2+ at 514 nm, and AmO2 2+ at 666 nm in 0.1 M nitric acid are reported. We also performed solvent extraction experiments with the hexavalent americium using the common actinide extraction ligand tributyl phosphate (TBP) for comparison to the other hexavalent actinides. Contact with 30% tributyl phosphate in dodecane reduced americium; it was nevertheless extracted using short contact times. The TBP extraction of AmO2 2+ over a range of nitric acid concentrations is shown for the first time and was found to be analogous to that of uranyl, neptunyl, and plutonyl ions.},
doi = {10.1021/ic800667h},
url = {https://www.osti.gov/biblio/936265}, journal = {Inorganic Chemistry},
issn = {0020-1669},
number = 15,
volume = 47,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2008},
month = {Fri Aug 01 00:00:00 EDT 2008}
}