Abstract
The synergistic extraction behavior of thiocyanate complexes of gadolinium, dysprosium and erbium has been studied for a mixed system: M3+/NH4SCN/tributyl phosphate (TBP)+tricaprylmonomethylammonium chloride (Aliquat-336)+ xylene. The percentage extraction and distribution ratios were measured as a function of the pH as well as the NH4SCN, Aliquat-336 and TBP concentrations, respectively. The percentage extraction of gadolinium, dysprosium and erbium increases with increase in pH. It was significant in the pH range 4 to 6 in a thiocyanate media. The composition of a binary synergistic extracted complex of lanthanides into the organic phase is probably M(SCN)52-(L+)2•2TBPo under the conditions studied. The synergistic extraction sequence as a function of the atomic number of lanthanide elements is given.
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