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  • Author or Editor: V. Spitsyn x
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Abstract  

The solubility of tetraalkylammonium pertechnetates in aqueous electrolyte solutions has been studied. It does not practically depend on ionic strength of the solution when specific interaction of own ions and ions of the dissolved electrolyte (e.g. LiNO3 up to 5 mol/l) does not occur. A remarkable dependence of Bu4NTcO4 solubility on acidity of the solution has been found. The influence of ion association on the solubility is discussed.

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Abstract  

The new radiation method for the determination of impurity anions in insoluble oxysalts is described. The analysis includes: (1) The irradiation of salts containing impurity anions at room temperature, (2) determination of maximum concentrations of impurity paramagnetic centers formed which are close to impurity anion concentration in the range of 10−3 up to 10−1 mole%. The method is valid for those anions whose ionization potentials are lower than the corresponding ionization potentials of the matrix.

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Abstract  

Electroreduction of oxygen-containing anions of the elements of VII group of periodic table, in particular, technetium is a very complicated process. The structure of electron shells of technetium 4d6 5s1 (s9/2), allows some oxidation states from +7 to −1, and shows the tendency to hydrolysis, disproportionation and to complex formation. Heptavalent state with d0-electron configuration and low tendency to reduction is characteristic for technetium and rhenium. We have studied the products of electroreduction of ion TcO 4 from sulphurous acid solutions of pertechnetate on platinum cathode using electrophoresis, methods of classic preparation chemistry, electron and vibratory spectroscopy. As a result we have succeeded in the isolation of the products of electrochemical reactions, identification and explaining some features of the process connected with the formation of metalic technetium and intermediate complex forms of reduced technetium.

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