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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption for both Chromium (III) and Chromium (VI) is pH dependant.  Adsorption of Chromium (III) is stronger in alkaline conditions whereas conversely adsorption of Chromum (VI) is stronger in acidic conditions.

Key value for chemical safety assessment

Additional information

There are no proprietary studies investigating the adsorption/desorption of the substance. The estimation methods given in the main Technical Guidance document for determining adsorption coefficients for soil, sediment and suspended sediment are not applicable to chromium compounds. Measured values are avaiolable in the EU RAR for a number of soil and sediment types. These values are presented in the study summary record.

In general, Chromium (III) is more strongly absorbed than Chromium (VI). Adsorption for both Chromium (III) and Chromium (VI) is pH dependant. Adsorption of Chromium (III) is stronger in alkaline conditions whereas conversely adsorption of Chromum (VI) is stronger in acidic conditions.