Supramolecular Chemistry
837
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Darmstadt, Germany) with Ultra pure water. The acidity
was checked by titration with NaOH.
The batch extraction experiments were performed in
2 ml glass vials. Organic and aqueous phases (500 ml) were
spiked with 10 ml of radiotracer (241Am, 152Eu, approx.
25 KBq/ml) and shaken by a vortex mixer for 15 min until
equilibrium (in the case of 14, the mixing time was
60 min). Separation of the phases by centrifugation was
followed by sampling of 200 ml of each phase for analysis
using high-purity germanium spectrometer system
obtained from EG&G Ortec, Mu¨nchen, Germany, and
equipped with the gamma vision software. The g-lines at
59.5 and 121.8 keV were examined for 241Am and 152Eu,
respectively. The distribution ratio D was measured as the
ratio between the radioactivity of an isotope in the organic
and the aqueous phases. Distribution ratios between 0.1
and 100 exhibit a maximum error of ^5%. The error may
be up to ^20% for smaller and larger values.
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Acknowledgements
The authors gratefully acknowledge the financial support from
the EU ACSEPT (Actinide recycling by separation and
transmutation) project (FP7 collaborative project 211267) and
HEC (higher education commission) Pakistan.
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