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Environmental fate & pathways

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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 of3-(trimethoxysilyl)propyl-(2E,4E)-hexa-2,4-dienoate, the distribution calculation is done for the silanol hydrolysis product, 3-(trihydroxysilyl)propyl-(2E,4E)-2,4-hexadienoate.

Table: Distribution modelling for STP

Fraction of emission directed to air by STP

1E-09

[%]

Fraction of emission directed to water by STP

99.9

[%]

Fraction of emission directed to sludge by STP

0.09

[%]

Fraction of the emission degraded in STP

0

[%]

3-(Trimethoxysilyl)propyl-(2E,4E)-hexa-2,4-dienoate hydrolyses rapidly to 3-(trihydroxysilyl)propyl-(2E,4E)-2,4-hexadienoate and methanol.

Methanol is readily biodegradable. 3-(Trihydroxysilyl)propyl-(2E,4E)-2,4-hexadienoate is not expected to undergo any significant biodegradation, and is predicted to have low Henry’s Law constant and low log Kow/log Koc. Distribution modelling for STP indicates that water is the main compartment to which it is expected to partition in a sewage treatment plant. Water is also likely to be the main compartment to which 3-(trihydroxysilyl)propyl-(2E,4E)-2,4-hexadienoate will partition in the wider environment.

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