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Environmental fate & pathways

Hydrolysis

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Link to relevant study record(s)

Reference
Endpoint:
hydrolysis
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

(Abiotic) degradation is an irrelevant process for inorganic substances that are assessed on an elemental basis.

Key value for chemical safety assessment

Additional information

According to REACH Annex XI, testing for a specific endpoint may be omitted if testing does not appear to be scientifically necessary or if it is technically not possible to conduct the study as a consequence of the properties of the substance. Under REACH (ECHA 2008, 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 (i.e., abiotic degradation). In the case of inorganic substances, like cerium trinitrate, the chemical safety assessment is generally based on the total (dissolved) elemental concentration, regardless of the element's (pH-dependent) speciation in the environment. Therefore, physicochemical processes like degradation or transformation by reaction with water are judged not relevant. Depending on the prevailing environmental conditions, formation of different Ce species may occur, but the chemical assessment will not make any differentiation among the different species. This total, element-based assessment (pooling all speciation forms together) can be considered as a worst-case assumption for the chemical assessment. In conclusion, (abiotic) degradation is an irrelevant process for inorganic substances that are assessed on an elemental basis.

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