Recovery of technetium99 from laboratory wastes

Volumetric titrations of technetium(IV) solutions with Ce(IV) have been performed with potentiometric, biamperometric and bipotentiometric detection of the equivalence point. Coulometric titrations of technetate(VII) solutions have been carried out with electrogenerated tin(lI). Precipitation titrations of both Tc(VII) and Tc(IV) solutions have been also performed with tetraphenylarsonium and tetraphenylphosphonium chloride solutions and radiometric detection of the equivalence point. A conductometric titration of technetate(VII) solutions has been also proposed.