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Environmental fate & pathways

Adsorption / desorption

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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 physicochemical properties of the substance indicate that it can be expected to have a low potential for adsorption

Description of key information


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.




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.