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Title: Spectroscopic and structural characterization of reduced technetium species in acetate media

Abstract

The reduction of ammonium pertechnetate by sodium borohydride in 0.1 M NaOH/glacial acetic acid has been studied. The reduction products (solids and solutions) have been characterized by UV-Visible spectroscopy, Scanning Electron Microscopy/Energy-dispersive X-ray emission spectroscopy (SEM/EDS), and X-ray absorption fine structure (XAFS) spectroscopy. UV-Visible spectra of the solution, after reduction, exhibit bands at 350 and 500 nm that have been attributed to the formation of polymeric Tc(IV) species. SEM/EDS on the solid (X-ray amorphous) indicates the absence of metallic Tc and the presence of oxygen. EXAFS measurements further indicate that the precipitate exhibits a [Tc({mu}-O){sub 2}Tc] core structure. XANES is consistent with the formation of Tc(III) and/or Tc(IV). Results infer that reduction of aqueous Tc(VII) by borohydride in the presence of acetic acid does not produce metallic Tc, but a mixture of various oxidation states of Tc near Tc(III) and Tc(IV).

Authors:
; ; ;  [1]
  1. UNLV
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - BASIC ENERGY SCIENCES
OSTI Identifier:
1027661
Resource Type:
Journal Article
Journal Name:
Journal of Radioanalytical and Nuclear Chemistry
Additional Journal Information:
Journal Volume: 288; Journal Issue: 3; Journal ID: ISSN 0236-5731
Country of Publication:
United States
Language:
ENGLISH
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; ABSORPTION; ACETATES; ACETIC ACID; BOROHYDRIDES; ELECTRONS; EMISSION SPECTROSCOPY; FINE STRUCTURE; MIXTURES; OXYGEN; PERTECHNETATES; SODIUM; SPECTRA; SPECTROSCOPY; TECHNETIUM; VALENCE

Citation Formats

Mausolf, Edward, Poineau, Frederic, Droessler, Janelle, and Czerwinski, Kenneth R. Spectroscopic and structural characterization of reduced technetium species in acetate media. United States: N. p., 2011. Web. doi:10.1007/s10967-011-1000-7.
Mausolf, Edward, Poineau, Frederic, Droessler, Janelle, & Czerwinski, Kenneth R. Spectroscopic and structural characterization of reduced technetium species in acetate media. United States. https://doi.org/10.1007/s10967-011-1000-7
Mausolf, Edward, Poineau, Frederic, Droessler, Janelle, and Czerwinski, Kenneth R. 2011. "Spectroscopic and structural characterization of reduced technetium species in acetate media". United States. https://doi.org/10.1007/s10967-011-1000-7.
@article{osti_1027661,
title = {Spectroscopic and structural characterization of reduced technetium species in acetate media},
author = {Mausolf, Edward and Poineau, Frederic and Droessler, Janelle and Czerwinski, Kenneth R},
abstractNote = {The reduction of ammonium pertechnetate by sodium borohydride in 0.1 M NaOH/glacial acetic acid has been studied. The reduction products (solids and solutions) have been characterized by UV-Visible spectroscopy, Scanning Electron Microscopy/Energy-dispersive X-ray emission spectroscopy (SEM/EDS), and X-ray absorption fine structure (XAFS) spectroscopy. UV-Visible spectra of the solution, after reduction, exhibit bands at 350 and 500 nm that have been attributed to the formation of polymeric Tc(IV) species. SEM/EDS on the solid (X-ray amorphous) indicates the absence of metallic Tc and the presence of oxygen. EXAFS measurements further indicate that the precipitate exhibits a [Tc({mu}-O){sub 2}Tc] core structure. XANES is consistent with the formation of Tc(III) and/or Tc(IV). Results infer that reduction of aqueous Tc(VII) by borohydride in the presence of acetic acid does not produce metallic Tc, but a mixture of various oxidation states of Tc near Tc(III) and Tc(IV).},
doi = {10.1007/s10967-011-1000-7},
url = {https://www.osti.gov/biblio/1027661}, journal = {Journal of Radioanalytical and Nuclear Chemistry},
issn = {0236-5731},
number = 3,
volume = 288,
place = {United States},
year = {Thu Nov 17 00:00:00 EST 2011},
month = {Thu Nov 17 00:00:00 EST 2011}
}