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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Environmental fate & pathways

Adsorption / desorption

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Administrative data

Link to relevant study record(s)

Reference
Endpoint:
adsorption / desorption: screening
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
the study does not need to be conducted because the substance has a low octanol water partition coefficient and the adsorption potential of this substance is related to this parameter

Description of key information

Adsorption/desorption:

log Koc [(3-chloropropyl)trimethoxysilane]: Low potential for adsorption due to rapid hydrolysis in contact with water

log Koc [(3-chloropropyl)silanetriol] = 0.45 (calculated)

Key value for chemical safety assessment

Additional information

The substance hydrolyses rapidly to substances which have low log Kow values (<3) and thus have low potential for adsorption, and the requirement for testing is waived. The parent substance itself also has a log Kow value <3.

For environmental exposure assessment, adsorption is predicted for the silanol hydrolysis product using the ‘non-hydrophobics’ log Kow-based prediction method for log Koc (Sabljic et al., 1995).

The relevant equation is:

Log Koc = 0.52 log Kow + 1.02

Therefore, log Koc for the silanol hydrolysis product = 0.45

Reference:

Sabljic, A, Güsten H, Verhaar H, Hermens J (1995) QSAR modelling of soil sorption. Improvements and systematics of log KOC vs. log KOW correlations. Chemosphere Volume 31, Issues 11–12, December 1995, Pages 4489–4514.