A rapid separation of Sr from Ca by solvent extraction with dicarbollides in the presence of EDTA and polyethylene glycols
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A typical composition of the solvent extraction system suitable for a rapid separation (3 min shaking) of Ca and Sr (separation factors β∼5000) in both tracer and macroconcentrations involves: organic phase−0.11M Li-dicarbollide and 1.65% Slovafol 909 in a mixture of 40% vol. CCl4 and 60% nitrobenzene; aqueous phase−0.15M EDTA, 0.1M (H, Li)Ac (acetate buffer), pH∼5.2. Replacing Slovafol 909 (suitable for the preconcentration of RdSr) by polyethylene glycol 400 enhances the distribution ratioDSr by a factor of 7 and β by a factor of 2. Using Na salts instead of Li ones IowersDSr by a factor of ∼100 and does not affect the β value. When separating macroamounts of Ca from Sr traces, care must be exercised to ensure the desired pH value and free EDTA concentration.
KeywordsAcetate EDTA Polyethylene Glycol Aqueous Phase
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