International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

Chromium in an aqueous environment can exist in various redox states, the most common being Cr(III), which is mainly in the form of an aquacomplex, and Cr(VI), which is mainly in the form of chromate ions. The distribution of compounds containing the respective forms of chromium depends on the redox potential, pH, the presence of an oxidizing or reducing agent, the kinetics of oxidation-reduction reactions, the formation of Cr(III) complexes or insoluble salts, and the total concentration of Cr.