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Environmental fate & pathways

Endpoint summary

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Administrative data

Description of key information

No data are put forward as this endpoint is not relevant for cerium, and metals in general.

Additional information

The endpoints "Phototransformation of an element in water, soil or air" and 'Hydrolysis" are not relevant for substances that are assessed on an elemental basis, i.e., based on the exposure and effects of cerium, expressed as elemental Ce.

For cerium substances, the chemical safety assessment is based on elemental metal concentration, i.e., the assessment of cerium is conducted regardless of the (pH-dependent) speciation in the environment. Hence, as the assessment is based on the element concentration (i.e., Ce), physicochemical processes like decomposition and degradation by reaction with water are not relevant. This elemental-based assessment (pooling together of all speciation forms) can be considered as a worst-case assumption for the chemical assessment.

In general, (abiotic) degradation is an irrelevant process for inorganic substances that are assessed on an elemental basis.