Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Hydrolysis

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
hydrolysis
Data waiving:
other justification
Justification for data waiving:
other:

Description of key information

Data waiving (other justification):

Abiotic processes, like degradation or transformation by reaction with water, are irrelevant for inorganic substances as long as they are assessed on an elemental basis.

Key value for chemical safety assessment

Additional information

Under REACH (ECHA 2016, Chapter R.7B - Endpoint Specific Guidance), the term "hydrolysis" refers to the "decomposition or degradation of a chemical by reaction with water", and this as a function of pH. In the case of inorganic substances, like cerium dioxide (whatever its form: bulk or nano), the assessment of environmental fate is generally based on the elemental concentration, regardless of the element's speciation which depends on the prevailing environmental conditions. In other words, formation of different cerium species may occur in the environment, but discriminating those species will add no value to the environmental fate assessment. The element-based evaluation (pooling all speciation forms together) can be effectively considered as a worst-case assumption. As a result, abiotic processes, like degradation or transformation by reaction with water, are irrelevant for inorganic substances as long as they are assessed on an elemental basis.