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Abstract <p>The Тс(VII) reduction with 1,2-diformylhydrazine in nitric acid solutions in the presence of uranyl nitrate was studied by spectrophotometry. Tc(VII) is reduced to Тс(IV) via intermediate Tc(V) species. The optical spectra were resolved into two components by mathematical deconvolution. The kinetic curves are S-shaped. Presumably, the induction period is associated with the formation of Тс(V). The rate equation of the Тс(IV) formation under these conditions was obtained. The Tc(V) formation rate increases with an increase in the diformylhydrazine and U(VI) concentrations, initial Тс(VII) concentration, and temperature but decreases with an increase in the nitric acid concentration. From the data obtained, the reaction constants were calculated and the partial reaction orders with respect to components were found.</p>

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Kinetics of Tc(VII) Reduction with Diformylhydrazine in a Nitric Acid Solution in the Presence of U(VI) Ions

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • K. N. Dvoeglazov,
  • E. D. Filimonova,
  • L. N. Podrezova,
  • E. Yu. Pavlyukevich

摘要

Abstract

The Тс(VII) reduction with 1,2-diformylhydrazine in nitric acid solutions in the presence of uranyl nitrate was studied by spectrophotometry. Tc(VII) is reduced to Тс(IV) via intermediate Tc(V) species. The optical spectra were resolved into two components by mathematical deconvolution. The kinetic curves are S-shaped. Presumably, the induction period is associated with the formation of Тс(V). The rate equation of the Тс(IV) formation under these conditions was obtained. The Tc(V) formation rate increases with an increase in the diformylhydrazine and U(VI) concentrations, initial Тс(VII) concentration, and temperature but decreases with an increase in the nitric acid concentration. From the data obtained, the reaction constants were calculated and the partial reaction orders with respect to components were found.