Registration Dossier
Registration Dossier
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EC number: 257-473-3 | CAS number: 51851-37-7
Endpoint summary
Administrative data
Description of key information
The distribution in a sewage treatment plant (STP) has been estimated using the SimpleTreat model (implemented in EUSES 2.1.2/Chesar 3.7), see table below.
Due to the moderately rapid hydrolysis of the registration substance to form [2-(perfluorohexyl)ethyl]silanetriol and ethanol, the distribution calculation is performed for the parent substance and its hydrolysis products.
Table: Distribution modelling for STP
|
[2-(Perfluorohexyl)ethyl]triethoxysilane (Parent) |
[2-(Perfluorohexyl)ethyl]silanetriol (Silanol HP) |
Ethanol |
|
Fraction of emission directed to water by STP |
3.737% |
96.78% |
12.62% |
[%] |
Fraction of emission directed to air by STP |
33.72% |
0.014% |
0.07% |
[%] |
Fraction of emission directed to sludge by STP |
62.53% |
3.201% |
0.069% |
[%] |
Fraction of the emission degraded in STP |
0% |
0% |
87.23% |
[%] |
The registration substance is not expected to undergo any significant biodegradation and is predicted to have very high Henry’s Law Constant and has high predicted log Kow/log Koc. Sludge and air are the main compartments to which it is expected to partition in a sewage treatment plant, with partition to water also being significant. The low solubility of the substance in water may affect the distribution within the sewage treatment plant model in the environmental exposure assessment.
Additional information
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