Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Based on read-across from an analogous substance, no significant biodegradation of the silanol hydrolysis product,(2,4,4-trimethylpentyl)silanetriol, is expected.

The chemical safety assessment indicates that it is not necessary to obtain further information on biodegradation via simulation tests in water, sediment or soil.

 

Degradation rate in water:

Hydrolysis half-life: approximately 5 h at 20-25°C (predicted). No significant biodegradation expected for the silanol hydrolysis product. 

The other hydrolysis product methanol is readily biodegradable.

Degradation rate in sediment:

Hydrolysis may occur (hydrolysis half-life in water approximately 5 h at 20-25°C (predicted)). No significant biodegradation expected for the silanol hydrolysis product. 

The other hydrolysis product methanol is readily biodegradable.

Degradation rate in soil:

Hydrolysis may occur (hydrolysis half-life in water approximately 5 h at 20-25°C (predicted)). No significant biodegradation expected for the silanol hydrolysis product. 

The other hydrolysis product methanol is readily biodegradable.

Degradation rate in air:

Half-life for reaction with hydroxyl radicals in air: 1.8 days (calculated).

Half-life for reaction with hydroxyl radicals in air of silanol hydrolysis product: 0.96 days (calculated).