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Environmental fate & pathways

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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 trimethoxy(methyl)silane, the distribution calculation is done for the silanol hydrolysis product, methylsilanetriol.

Table: Distribution modelling for STP

Fraction of emission directed to air by STP

6.4E-06

[%]

Fraction of emission directed to water by STP

100

[%]

Fraction of emission directed to sludge by STP

7.4E-03

[%]

Fraction of the emission degraded in STP

0

[%]

Trimethoxy(methyl)silane hydrolyses rapidly to methylsilanetriol. Methylsilanetriol is not expected to undergo any significant biodegradation, has low Henry’s Law constant and low log Kow/log Koc. Therefore water is the main compartment to which it is expected to partition.