Registration Dossier
Registration Dossier
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EC number: 260-350-7 | CAS number: 56706-10-6
Endpoint summary
Administrative data
Description of key information
Abiotic degradation
In contact with water, the substance is expected to undergo hydrolysis with a half-life of 40-80 h at pH 7 and 20-25°C to form (3-{[3-(trihydroxysilyl)propyl]disulfanyl}propyl)silanetriol and ethanol. Given the moderate rate of hydrolysis, the environmental hazard assessment is based on the properties of the parent substance in accordance with REACH guidance for Chemical Safety Assessment (Chapter R16).
3-{[3-(Trihydroxysilyl)propyl]disulfanyl}propyl)silanetriol is the expected final product of hydrolysis reactions under conditions of a hydrolysis laboratory study. However, other biotic or abiotic reactions may occur over longer time-scales in the environment.
Biotic degradation
A guideline GLP biodegradation study for the substance indicates limited biodegradability; 20% in 28 days. This biodegradation is likely to be mostly due to the ethanol hydrolysis product, which is expected to biodegrade rapidly. The risk characterisation ratios (RCRs) for the aquatic, sediment and terrestrial compartments, based on the assumption that the parent substance and the silanol hydrolysis products are not biodegradable, are < 1, and so it is not necessary to obtain further information on biodegradation via simulation tests in water, sediment or soil.
Table 4.1.5. Degradation rates
Degradation rate in water: | Hydrolysis half-life: 40-80 at pH 7 and 20-25°C (predicted), for removal of parent substance. No significant biodegradation expected. |
Degradation rate in sediment: | No significant biodegradation expected. |
Degradation rate in soil: | No significant biodegradation expected. |
Degradation rate in air: | Half-life for reaction with hydroxyl radicals in air: 0.1 days for parent substance; 0.1 days for silanol hydrolysis product (predicted). |
Additional information
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