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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/Chesar 3.4), see table below. Due to the rapid hydrolysis of the parent substance, the distribution calculation is done for the hydrolysis products.

Table: Distribution modelling for STP

3 -Chloropropyl(methyl)silanediol

Methanol

  

Fraction of emission directed to water by STP

99.62

12.62

  

[%]

Fraction of emission directed to air by STP

1.04E-4

0.095

  

[%]

Fraction of emission directed to sludge by STP

0.374

0.037

  

[%]

 Fraction of the emission degraded in STP

 0

 87.24

  

[%]

3-Chloropropyl(dimethoxy)methylsilane hydrolyses rapidly in contact with water to form 3-chloropropyl(methyl)silanediol and methanol. 3 -Chloropropyl(methyl)silanediol 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 in a sewage treatment plant.