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Adsorptive stripping voltammetry of chromium 1,5‐diphenylcarbazonate
Author(s) -
Malakhova Natalia A.,
Chernysheva Albina V.,
Brainina Khiena Z.
Publication year - 1991
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.1140030814
Subject(s) - adsorptive stripping voltammetry , chromium , voltammetry , stripping (fiber) , chemistry , anodic stripping voltammetry , nuclear chemistry , environmental chemistry , materials science , electrode , electrochemistry , organic chemistry , composite material
Electrochemical transformations of chromium 1,5‐diphenylcarbazonate (the complex), absorbed on the surface of a graphite electrode from a solution of 0.15 M sulfuric acid, were studied. The complex was synthesized by mixing acetone solutions of CrCl 3 ·6H 2 O and diphenylcarbazone, as well as aqueous solutions of K 2 Cr 2 O 7 and aqueous acetone solutions of diphenylcarbazide. The complex is absorbed on the electrode over the potential interval 0.55–0.30 V when the circuit is open. In the presence of diphenylcarbazide this interval narrows considerably as a result of competing absorption. Electrochemical reduction of the complex proceeds in stages, with formation of a chromium‐containing radical as an intermediate product that is subsequently reduced to diphenylcarbazide, with chromium(III) released to the solution. Absorbed complex is electrochemically oxidized in one stage mainly, with diphenylcarbadiazone formed as the main product.