Effect of the Anionic Composition and pH on the Dissolution Kinetics of Chromium(III) Oxide and Chromium(III) Hydroxide Oxide in Acids

摘要

Based on an experimental investigation of the effects of the pH and anionic composition on the dissolution rate of chromium(III) oxide alpha-Cr_2O_3 and chromium(III) hydroxide oxide alpha-CrOOH and subsequent modeling of the process, it is demonstrated that, depending on the pH, the rate-controlling stage of the dissolution is the CrOH~(2+) or CrHSO_4~(2+) solubilization.