Registration Dossier

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), see table below.

Due to the rapid hydrolysis of the constituents of the registration substance, the distribution calculations are done for the silanol hydrolysis products.

Table: Distribution modelling for STP

 

Methylsilanetriol (HP 1)

(3-Aminopropyl)silanetriol (HP 2)

5-Oxa-9-aza-1,13-disilatridecane-1,1,1,7,13,13,13-heptol (HP 3)

 

Fraction of emission directed to water by STP

 99.98

 99.75

 99.75

[%]

Fraction of emission directed to air by STP

 2.57E-7

 4.65E-11

 0

[%]

Fraction of emission directed to sludge by STP

 0.013

 0.25

 0.25

[%]

Fraction of the emission degraded in STP

 0

 0

 0

[%]

 

The constituents of the registration substance hydrolyse rapidly to form the corresponding silanol hydrolysis products. The silanol hydrolysis products are not expected to undergo any significant biodegradation, have low Henry’s Law constant and low log Kow/log Koc. Therefore, water is the main compartment to which the silanol hydrolysis products are expected to partition.