Reduction of trivalent chromium-ions on stationary mercury electrode in concentrated LiCl solutionsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация: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 voltarnmetry. It is found that an increase in the LiCl molar concentration m from 0.4 to approximate to7 weakly affects the position of the cathodic current peak potential Ep(1) corresponding to this process. In the mentioned concentration range, [Cr(H2O)(6-n)Cl-n](3-n) (0 less than or equal to 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)(3)Cl-3] (n = 3) complex, which is followed by its reduction.