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Environmental fate & pathways

Adsorption / desorption

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Description of key information

Adsorption/desorption:

log Koc [ 3-(trimethoxysilyl)propane-1-thiol]: Low potential for adsorption

log Koc [ 3-(trihydroxysilyl)propanethiol] = 0.29 (predicted)

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 = 0.29.

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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