Abstract
The interaction of Bi(V)-containing oxides and peroxides with Cu(II) salts in alkaline solutions of KIO4 and K2TeO6 is studied by spectrophotometry, potentiometry, and potentiometric titration. It is found that the Bi2O4.09, NaBiO3, BaBiO3, and K n Ba m Bi m + n O y (n = 1–3, m = 1, 3–5) oxides, exhibiting superconducting properties (T c = 28–32 K), unlike the BaO2 and H2O2 peroxides, oxidize Cu(II) to complex diperiodatocuprate(III)-[Cu(IO6) 7−2 ] and ditelluratocuprate(III)-[Cu(TeO6) 9−2 ] ions of a yellow-brown color. The optimum concentrations of the reagents (CuCl2, KIO4, and KOH) are determined for the identification of Bi(V) and O 2−2 by the drop test method.
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Original Russian Text © N.V. Barkovskii, 2014, published in Zhurnal Analiticheskoi Khimii, 2014, Vol. 69, No. 2, pp. 127–134.
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Barkovskii, N.V. Physicochemical basics for using redox Cu(III)-Cu(II) system for the identification of Bi(V) and O 2−2 in Ba-Bi-O and K-Ba-Bi-O oxides. J Anal Chem 69, 116–122 (2014). https://doi.org/10.1134/S1061934813120022
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DOI: https://doi.org/10.1134/S1061934813120022