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Simultaneous determination of radioactive and stable isotopes of cobalt in environmental samples by the isotopic exchange method.

The isotopic exchange method is studied for the simultaneous determination of radioactive and stable isotopes of cobalt in environmental samples. Radioactive cobalt is isotopically exchanged with Co-CyDTA in HC1 solution of the sample. The solvent extraction method is used for the separation of Co2+ and Co-CyDTA species from each other. The amounts of radioactive and stable cobalt isotopes are calculated with activities of Co and Co-CyDTA at the exchange equilibrium. The methods for eliminating interfering ions are discussed. The results are in good concordance with those obtained by the conventional analytical methods.

Cobalt Isotopes

Pharmacokinetic behaviour of bleomycin-cobalt-57 with special regard to intraarterial perfusion of the maxillo-facial region.

Bleomycin was traced by the isotope Cobalt-57. By using this radioactive substance the pharmacokinetic behaviour of the drug was examined. It was given either intravenously or intra-arterially or directly into the tumor in patients suffering from epidermoid carcinoma in the maxillo-facial region. The differences in the pharmacokinetic data are delineated. Practically, the intra-arterial route of administration is the best one because of the high adherence rate of the drug to the perfused tissue.

Bleomycin