Reduction of Trivalent Chromium Ions on Stationary Mercury
Electrode in Concentrated LiCl Solutions

V. N. Korshunov, L. N. Vykhodtseva, and V. A. Safonov^z

Faculty of Chemistry, Moscow State University, Vorob’evy Gory 1, Moscow, 119992 Russia

Received July 22, 2003

Abstract—The effect of supporting-electrolyte (LiCl) concentration on the first stage Cr(III) + e Cr(II) of
Cr(III) reduction on a stationary mercury electrode is studied by linear voltammetry. It is found that an increase
in the LiCl molar concentration m from 0.4 to 7 weakly affects the position of the cathodic current peak poten-
tial E_P1 corresponding to this process. In the mentioned concentration range, [Cr(H₂O)_6nCl_n]³ⁿ (0 n < 3)
ions are preferentially reduced. The further increase in m up to 19.1 results in a substantial positive shift of E_P1,
which is associated with the formation (upon passing the complete hydration limit) of the [Cr(H₂O)₃Cl₃] (n =3)
complex, which is followed by its reduction.

Key words: electroreduction of Cr(III), stationary mercury electrode, concentrated solutions of LiCl

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