Registration Dossier
Registration Dossier
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EC number: 219-785-8 | CAS number: 2530-85-0
Endpoint summary
Administrative data
Description of key information
Additional information
The distribution in a sewage treatment plant (STP) has been estimated using the SimpleTreat model (implemented in EUSES 2.1.2/Chesar 3.5), see table below. Due to the rapid hydrolysis of the parent substance, the distribution calculation is done for the hydrolysis products, 3-(trihydroxysilyl)propyl methacrylate and methanol.
Table: Distribution modelling for STP
| 3-(Trihydroxysilyl)propyl methacrylate | Methanol | Unit |
Release directed to water | 99.95 | 12.62 | [%] |
Release directed to air | 8.84E-10 | 0.095 | [%] |
Release directed to sludge | 0.044 | 0.037 | [%] |
Release degraded | 0 | 87.24 | [%] |
3-Trimethoxysilylpropyl methacrylate hydrolyses rapidly to 3-(trihydroxysilyl)propyl methacrylate and methanol. 3-Trimethoxysilylpropyl methacrylate is readily biodegradable but failing the 10-day window. Once the biodegradation of the alkoxy groups is taken into account, there is evidence that the methacrylate side-chain is biodegrading to some extent, but as a worst-case; 3-(trihydroxysilyl)propyl methacrylate is considered to be not biodegradable. Methanol is readily biodegradable.
3-(Trihydroxysilyl)propyl methacrylate has very low Henry’s Law Constant, and low log Kow/log Koc. Distribution modelling for STP indicates that water is the main compartment to which 3-(trihydroxysilyl)propyl methacrylate is expected to partition in a sewage treatment plant. Water is also likely to be the main compartment to which it will partition in the wider environment.
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