Fersiynau electronig


Dangosydd eitem ddigidol (DOI)

  • Karen A. Hudson-Edwards
  • Patrick Byrne
    Centre for Public Health, Liverpool John Moores University
  • Graham Bird
  • Paul A. Brewer
    Aberystwyth University
  • Ian T. Burke
  • Heather E. Jamieson
    Queen’s University, Kingston, Canada
  • Mark G. Macklin
  • Richard D. Williams
Results are presented from the analysis of aqueous and solid-phase V speciation within samples collected from the Hazeltine Creek catchment affected by the August 2014 Mount Polley mine tailings dam failure, Canada. Electron microprobe and XANES analysis found that V is present as V3+ substituted into magnetite, and V3+ and V4+ substituted into titanite, both of which occur in the spilled Mount Polley tailings. Secondary Fe oxyhydroxides forming in inflow waters and on creek beds have V K-edge XANES spectra exhibiting E½ positions and pre-edge features consistent with the presence of V5+ species, suggesting sorption of this species on these secondary phases. PHREEQC modelling suggests that the stream waters mostly contain V5+, and the inflow and pore waters contain a mixture of V3+ and V5+. These data, and stream, inflow and pore water chemical data, suggest that dissolution of V(III)-bearing magnetite, V(III,IV)-bearing titanite, V(V)-bearing Fe(-Al-Si-Mn) oxhydroxides, V-bearing Al(OH)3 and/or -clay minerals may have occurred. In the circumneutral pH environment of Hazeltine Creek elevated V concentrations are likely naturally attenuated by formation of V(V)-bearing secondary Fe oxyhydroxide, Al(OH)3 or clay mineral colloids, suggesting that the V is not bioavailable. A conceptual model is presented describing the origin and fate of V in Hazeltine Creek that is applicable to other river systems.
Iaith wreiddiolSaesneg
Tudalennau (o-i)4088–4098
CyfnodolynEnvironmental Science and Technology
Rhif y cyfnodolyn8
Dyddiad ar-lein cynnar4 Maw 2019
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 16 Ebr 2019

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