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Environmental fate & pathways

Adsorption / desorption

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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.

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