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Environmental fate & pathways

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Administrative data

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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), see table below. Due to the rapid hydrolysis of the parent substance, the distribution calculation is done for the silanol hydrolysis product.

Table: Distribution modelling for STP

Fraction of emission directed to air by STP

2.41E-09

[%]

Fraction of emission directed to water by STP

100

[%]

Fraction of emission directed to sludge by STP

0.0446

[%]

Fraction of the emission degraded in STP

0

[%]

 

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.