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Environmental fate & pathways

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Description of key information

‘Hydrolysis’ refers to the “Decomposition or degradation of a chemical by reaction with water”, and is a concept that is relevant for organic compounds, that may or may not decompose in water, e.g. by abiotic degradation. The need for testing may be waived if “The substance is highly insoluble in water), or if “The substance is readily biodegradable”.

For metals and inorganic substances, the chemical safety assessment is based on the (bioavailable) concentrations of the ion, e.g. Zn2+, Mg2 +, Cd2+,…,. For the bioavailable ionic concentration of the metal elements (MeX+), physicochemical processes like decomposition and degradation by reaction with water are not relevant. The applied pooling of all elemental-metal ions together, can be considered as a worst-case assumption for the assessment. In general, (abiotic) degradation is an irrelevant process for inorganic substances that are assessed on an elemental basis.

Phototransformation in the different compartments is not applicable either.

Additional information

Waived: Inorganic substance: According to Annex IX of REACH Regulation, information on hydrolysis is not required for inorganics.

Also the other endpoints under IUCLID section 5.1. e.g; phototransformation in air, water and soil, are not applicable to the substance