Registration Dossier

Diss Factsheets

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 3.5), see table below. Although the registered substance hydrolyses rapidly in contact with water, the distribution calculation is done for all assessment entities.

Table: Distribution modelling for STP

 

(3-Chloropropyl)trimethoxysilane

(3-Chloropropyl)silanetriol

Methanol

Unit

Fraction of emission directed to water by STP

96.10

99.96

12.62

[%]

Fraction of emission directed to air by STP

2.488

1.62E-7

0.095

[%]

Fraction of emission directed to sludge by STP

1.408

0.035

0.037

[%]

Fraction of the emission degraded in STP

0

0

87.24

[%]

(3-Chloropropyl)trimethoxysilane hydrolyses rapidly to (3-chloropropyl)silanetriol and methanol. Methanol is readily biodegradable. (3-Chloropropyl)silanetriol is not expected to undergo any significant biodegradation, and is predicted to have 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 both the parent substance and the silanol hydrolysis product are expected to partition in a sewage treatment plant. Water is also likely to be the main compartment to which (3-chloropropyl)silanetriol will partition in the wider environment following hydrolysis of the parent substance.

Categories Display