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Environmental fate & pathways

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Based on read-across from an analogous substance, no significant biodegradation of the silanol hydrolysis product octylsilanetriol 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.

Table 4.1.6: Degradation rates

Degradation rate in water:

Hydrolysis half-life: < 1 minute at 25°C (predicted). No significant biodegradation expected for the silanol hydrolysis product.

Degradation rate in sediment:

Hydrolysis may occur (hydrolysis half-life in water: < 1 minute at 25°C (predicted)). No significant biodegradation expected for the silanol hydrolysis product.

Degradation rate in soil:

Hydrolysis may occur (hydrolysis half-life in water:< 1 minute at 25°C (predicted)). No significant biodegradation expected for the silanol hydrolysis product.

Degradation rate in air:

Half-life for reaction with hydroxyl radicals in air: 1.7 days (calculated).

Hydrolysis reaction with water vapour in air may occur.

Half-life for reaction with hydroxyl radicals in air of silanol hydrolysis product: 0.8 days (calculated).