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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption/desorption [3-(trimethoxysilyl)propiononitrile]: Low potential for adsorption

Log Koc for silanol hydrolysis product = -0.5 (predicted).

Key value for chemical safety assessment

Additional information

The substance hydrolyses rapidly to form 3-(trihydroxysilyl)propiononitrile and methanol.

3-(Trihydroxysilyl)propiononitrile has low log Kow value (<3) and thus has low potential for adsorption, and the requirement for testing is waived.

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 = -0.52 log Kow + 1.02

Therefore, log Koc for silanol hydrolysis product, 3-(trihydroxysilyl)propiononitrile = -0.5.

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 wtihin 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.