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Environmental fate & pathways

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 3.4), see table below. Due to the moderate hydrolysis of the registered substance, the distribution calculation is done for both the parent substance and the hydrolysis products, 3-(trihydroxysilyl)propanethiol and ethanol.

Table: Distribution modelling for STP

 

3-(Triethoxysilyl)propanethiol

3-(Trihydroxysilyl)propanethiol

Ethanol

 Unit

Fraction of emission directed to water by STP

98.47

99.97

12.62

[%]

Fraction of emission directed to air by STP

1.204

1.62E-8

0.075

[%]

Fraction of emission directed to sludge by STP

0.32

0.025

0.069

[%]

Fraction of the emission degraded in STP

0

0

87.23

[%]

 

3-(Triethoxysilyl)propanethiol 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.

3-(Trihydroxysilyl)propanethiol is predicted to have very low Henry's Law constant, low log Kow/log Koc. Therefore, 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)propanethiolwill partition in the wider environment.