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Charge and Nature of Technetium Species Produced in the Reduction of Pertechnetate by Stannous Ion

State University of New York at Buffalo, Buffalo, New York

Correspondence: For reprints contact: Azu Owunwanne, Div. of Nuclear Medicine, University of Rochester Medical Center, Rochester, NY 14642.

ABSTRACT

By using a cation-exchange distribution technique, the net charge of the technetium species produced in the reduction of pertechnetate by stannous ion at ph 2 has been determined to be +2. The species carrying this charge is either the dihydroxy technetate (Tc(OH)₂²⁺) ion or the oxotechnetate (TcO²⁺) ion. These species are hydrolysed to technetium dioxide dihydrate (TcO₂ 2H₂O) at higher pH.

The advantage of the ion-exchange distribution technique for these studies is that they can be done with carrier-free technetium rather than at the high concentrations required for the more conventional methods of ion charge determination. The results, therefore, are more likely to be applicable to the situation existing in the routine preparation of Tc-99m radiopharmaceuticals.

FOOTNOTES

^* Present address: Div. of Nuclear Medicine, University of Rochester Medical Ctr, Rochester, NY 14642.