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    STUDIA CHEMIA - Issue no. 4(II) / 2009  
         
  Article:   USE AQUEOUS PEG-INORGANIC SALT TWO-PHASE SYSTEMS FOR Bi(III) EXTRACTION IN THE PRESENCE OF INORGANIC EXTRACTANTS.

Authors:  DUMITRU BULGARIU, LAURA BULGARIU. 		 
       
         
  Abstract:  The Bi(III) extraction behaviour was studied in aqueous polyethylene glycol (PEG) – (NH4)2SO4 two-phase system, using inorganic anions (I-, Br-, Cl- and SCN-), as extractants. The aqueous two-phase systems were prepared using aqueous solutions of phase-forming components (PEG and (NH4)2SO4) in water or in 1N H2SO4. The experimental results show that more adequate for Bi(III) extraction is the aqueous two-phase systems, where the aqueous solutions of phase-forming components are prepared in 1N H2SO4. Under these conditions, the addition of inorganic extractants determined the partitioning of Bi(III) into PEG-rich phase, easy observable at extractants concentration higher than 0.06 mol/dm3. The efficiency of extractants follows the order: I- >> Br- > Cl- >> SCN-. Using the Bi(III) distribution coefficients calculated as a function of inorganic extractants concentration, the extracted species were assumed.

Keywords: aqueous PEG-based two-phase system, Bi(III) extraction, inorganic extractants
  
         
     
         
         
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