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), see table below.

Table: Distribution modelling for STP

 

 

Fraction of emission directed to air by STP

6.04

[%]

Fraction of emission directed to water by STP

7.09

[%]

Fraction of emission directed to sludge by STP

86.9

[%]

Fraction of the emission degraded in STP

0

[%]

The constituents of Silsesquioxanes, Phenyl are not expected to undergo any significant biodegradation, and are predicted to have high Henry’s Law constants and high log Kow/log Koc. Distribution modelling for STP indicates that sludge is the main compartment to which they are expected to partition in a sewage treatment plant, with partition to water and air also being significant. Sediment and soil are likely to be the main compartments to which Silsesquioxanes, Phenyl will partition in the wider environment.