Efficient phase transfer of pertechnetate with bicyclic guanidinium compounds

Extraction of pertechnetate with bicyclic guanidinium compounds has been st udied in the KTcO4-buffer-H2O/ligand-trichloromethane system. Extraction da ta of guanidinium ligands have been compared with trialkylmethylammonium (A liquat336), tetraphenylphosphonium and tetraphenylarsonium chloride. The li pophilicity of extractants investigated was determined by RP-HPLC. The effi ciency of pertechnetate extraction correlates with the lipophilicity of the guanidinium compounds. 1:1 complex formation in the organic phase was obse rved. The influence of hydroxide, chloride and bicarbonate on the pertechne tate extraction has been investigated. Pertechnetate is extracted with grea t preference over OH-, Cl- and HCO3-, ions.