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Environmental fate & pathways

Adsorption / desorption

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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

Log Koc [3-trimethoxysilylpropyl methacrylate]: not relevant due to rapid hydrolysis of the substance in contact with water

Log Koc [ 3-(trihydroxysilyl)propyl methacrylate]: 0.55 (calculation)

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 developed by Sabljic and Güsten (1995) for the European Commission, and recommended in EU Guidance.

The relevant equation is:

Log Koc = 0.52log Kow + 1.02

Therefore, log Koc for silanol hydrolysis product = 0.55.

Reference:

Sabljic A and Güsten H (1995) QSARs for soil sorption. in: overview of structure-activity relationships for environmental endpoints. Hermens JLM (ed), report prepared within the framework of the project "QSAR for prediction of fate and effects of chemicals in the environment", an international project of the Environmental Technologies RTD programme (DG XII/D-1) of the European Commission under contract number EV5V-CT92-0211.