Uranium fate during crystallization of magnetite from ferrihydrite in conditions relevant to the disposal of radioactive waste

Timothy A. Marshall, Katherine Morris, Gareth T.W. Law, Frederick W. Mosselmans, Pieter Bots, Hannah Roberts, Samuel Shaw

Research output: Contribution to journalArticle

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58 Downloads (Pure)

Abstract

Uranium incorporation into magnetite and its behaviour during subsequent oxidation has been investigated at high pH to determine the uranium retention mechanism(s) on formation and oxidative perturbation of magnetite in systems relevant to radioactive waste disposal. Ferrihydrite was exposed to U(VI)aq containing cement leachates (pH 10.5-13.1) and crystallization of magnetite was induced via addition of Fe(II)aq. A combination of XRD, chemical extraction and XAS techniques provided direct evidence that U(VI) was reduced and incorporated into the magnetite structure, possibly as U(V), with a significant fraction recalcitrant to oxidative remobilization. Immobilization of U(VI) by reduction and incorporation into magnetite at high pH, and with significant stability upon reoxidation, has clear and important implications for limiting uranium migration in geological disposal of radioactive wastes. © 2016 by Walter de Gruyter Berlin/Boston.
Original languageEnglish
Pages (from-to)1265-1274
Number of pages10
JournalMineralogical Magazine
Volume79
Issue number6
DOIs
Publication statusPublished - 1 Dec 2015

Fingerprint

Ferrosoferric Oxide
Radioactive Waste
Uranium
ferrihydrite
Crystallization
radioactive waste
magnetite
uranium
crystallization
Radioactive waste disposal
remobilization
waste disposal
immobilization
leachate
Cements
cement
X-ray diffraction
perturbation
oxidation
Oxidation

Keywords

  • EXAFS
  • geodisposal
  • uranium incorporation
  • magnetite
  • radioactive waste
  • uranium
  • uranium retention mechanisms
  • uranium migration

Cite this

Marshall, Timothy A. ; Morris, Katherine ; Law, Gareth T.W. ; Mosselmans, Frederick W. ; Bots, Pieter ; Roberts, Hannah ; Shaw, Samuel. / Uranium fate during crystallization of magnetite from ferrihydrite in conditions relevant to the disposal of radioactive waste. In: Mineralogical Magazine. 2015 ; Vol. 79, No. 6. pp. 1265-1274.
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Uranium fate during crystallization of magnetite from ferrihydrite in conditions relevant to the disposal of radioactive waste. / Marshall, Timothy A.; Morris, Katherine; Law, Gareth T.W.; Mosselmans, Frederick W.; Bots, Pieter; Roberts, Hannah; Shaw, Samuel.

In: Mineralogical Magazine, Vol. 79, No. 6, 01.12.2015, p. 1265-1274.

Research output: Contribution to journalArticle

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AU - Marshall, Timothy A.

AU - Morris, Katherine

AU - Law, Gareth T.W.

AU - Mosselmans, Frederick W.

AU - Bots, Pieter

AU - Roberts, Hannah

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