Yttrium and Rare Earth Element Complexation by Chloride Ions at 25°C

Yu-Ran Luo, Robert H. Byrne

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Abstract

<p> Formation constants for yttrium and rare earth element (YREE) chloride complexation have been measured at 25&deg;C by examining the influence of medium (NaClO <sub> 4 </sub> and NaCl) on YREE complexation by fluoride ions and methyliminodiacetate (MIDA). YREE chloride complexation constants <sub> Cl </sub> &beta; <sub> 1 </sub> ( <em> M </em> ) obtained in this work using dissimilar procedures are in good agreement and indicate that, at constant temperature and ionic strength, <sub> Cl </sub> &beta; <sub> 1 </sub> ( <em> M </em> ) does not vary significantly across the fifteen-member series of elements. The ionic strength &mu; dependence of YREE chloride formation constants between 0 and 6 molar ionic strength can be written, for all YREE, as logCI&beta;1(M)=logCI&af;&beta;10(M)&minus;3.066&mu;0.5/(1+1.727&mu;0.5)"&gt;logCI&beta;1(M)=logCI&beta;01(M)&minus;3.066&mu;0.5/(1+1.727&mu;0.5)logCI&beta;1(M)=logCI&af;&beta;10(M)&minus;3.066&mu;0.5/(1+1.727&mu;0.5)</p><p> where <sub> Cl </sub> &beta; <sub> 1 </sub> ( <em> M </em> ) = [MCl <sup> 2+ </sup> ][M <sup> 3+ </sup> ] <sup> &minus;1 </sup> [Cl <sup> &minus;1 </sup> ] <sup> &minus;1 </sup> and log <sub> Cl </sub> &beta; <sub> 1 </sub> <sup> o </sup> ( <em> M </em> ) represents the MCl <sup> 2+ </sup> formation constant for all YREE at zero ionic strength: log <sub> Cl </sub> &beta; <sub> 1 </sub> <sup> o </sup> = 0.65 &plusmn; 0.05.</p>
Original languageAmerican English
JournalJournal of Solution Chemistry
Volume30
DOIs
StatePublished - Jan 1 2001

Keywords

  • rare earth elements
  • complexation
  • chloride
  • stability constants
  • ionic strength
  • lanthanide
  • yttrium
  • MIDA

Disciplines

  • Life Sciences

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