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Journal article: Removal of aqueous As using FE attached immobilized ligands

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  • Suiling Wang
    http://highwire.stanford.edu/cgi/medline/pmid;17129954 Removal of aqueous arsenic using iron attached to immobilized ligands (IMLIGs). DF Martin, L O donnell,
    Message 1 of 1 , Dec 4, 2006
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      http://highwire.stanford.edu/cgi/medline/pmid;17129954

      Removal of aqueous arsenic using iron attached to immobilized
      ligands (IMLIGs). DF Martin, L O'donnell, BB Martin, and R Alldredge
      J Environ Sci Health A Tox Hazard Subst Environ Eng, January 1,
      2007; 42(1):97-102.

      Abstract: The present study describes the synthesis of the iron(III) salt of a
      commercially available immobilized ligand, IMLIG, Octolig-21 and its use to
      remove arsenic from aqueous solutions. The synthesis was accomplished by
      treating an aqueous suspension of Octolig-21 with an equal weight of ferrous
      sulfate heptahydrate under nitrogen. The ferrous salt was then collected by
      sieving and allowed to oxidize to the iron (III) salt by exposure to air, and
      treatment with dilute sodium hydroxide converted the composite to the
      hydroxide. Using standard test water containing 300 ppb As and column
      chromatography, reduction of the arsenic concentration to 3 ppb or less in the
      effluent was achieved, using a pair of columns (4.5 cm id; 1780 mL and 2019 mL,
      respectively) in tandem. Subsequently, the Fe(III)-Octolig composite was tested
      for capacity, and it was calculated that with an input of 50 ppb As, it could
      take up to a year for the effectiveness to be exhausted.
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