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Radiochimica Acta

International Journal for chemical aspects of nuclear science and technology

Editor-in-Chief: Qaim, Syed M.

IMPACT FACTOR 2018: 1.339

CiteScore 2018: 1.20

SCImago Journal Rank (SJR) 2018: 0.333
Source Normalized Impact per Paper (SNIP) 2018: 0.720

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Volume 96, Issue 12


Pertechnetate immobilization with amorphous iron sulfide

Yongjian Liu / Jeff Terry
  • 2 Illinois Institute of Technology, Department of Biological, Chemical, and Physical S, Chicago, U.S.A.
  • Other articles by this author:
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/ Silvia S. Jurisson
Published Online: 2009-09-25 | DOI: https://doi.org/10.1524/ract.2008.1528


The reduction of pertechnetate (TcO4) with freshly prepared amorphous iron sulfide was investigated. The amorphous iron sulfide (FeS) was shown to have an elemental composition of FeS0.97 for all of the size fractions and a point of zero charge of pHpzc=7.4. Solubility studies of FeS in various buffers indicated that in the pH range 6.1–9.0, the concentrations of dissociated Fe2+ and S2− were negligible. The reductive immobilization of TcO4 with FeS was shown to be accelerated by increasing ionic strength and strongly pH dependent. At pH values below the pHpzc, the positively charged FeS surface reacted much faster with TcO4 and had higher immobilization yields relative to the negatively charged FeS surface at pH values above pHpzc. The TcO4−FeS reaction is consistent with a surface mediated reaction through ligand exchange. The TcO4−FeS reductive immobilization reaction product was characterized by X-ray absorption near edge spectroscopy (XANES), extended X-ray absorption fine structure (EXAFS), Fourier transform infrared spectroscopy (FT-IR), and energy dispersive X-ray spectroscopy (EDS) and found to be predominantly TcO2. Studies on the reductive capacity of the FeS and the long term stability of the TcO4−FeS reaction product under both anaerobic and aerobic environments shows the potential utility of the in situ gaseous (hydrogen sulfide gas) immobilization technology in solidification of TcO4 by creating a FeS permeable reaction barrier in the vadose zone.

Keywords: Technetium-99; Iron sulfide; Pertechnetate immobilization

About the article

* Correspondence address: University of Missouri-Columbia, Department of Chemistry, 125 Chemistry Building, MO 65211 Columbia, U.S.A.,

Published Online: 2009-09-25

Published in Print: 2008-12-01

Citation Information: Radiochimica Acta, Volume 96, Issue 12, Pages 823–833, ISSN (Online) 2193-3405, ISSN (Print) 0033-8230, DOI: https://doi.org/10.1524/ract.2008.1528.

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