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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), see table below. Due to the rapid hydrolysis of 2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, the distribution calculation is done for the silanol hydrolysis product, 2-(3,4-epoxycyclohexyl)ethylsilanetriol.

Table: Distribution modelling for STP

Fraction of emission directed to air by STP

1.4E-09

[%]

Fraction of emission directed to water by STP

99.9

[%]

Fraction of emission directed to sludge by STP

0.064

[%]

Fraction of the emission degraded in STP

0

[%]

2-(3,4-epoxycyclohexyl)ethyltrimethoxysilane hydrolyses rapidly to 2-(3,4-epoxycyclohexyl)ethylsilanetriol. 2-(3,4-epoxycyclohexyl)ethylsilanetriol is not expected to undergo any significant biodegradation, and is predicted to have low Henry’s Law constant and low log Kow/log Koc. Therefore water is the main compartment to which it is expected to partition in a sewage treatment plant.