Registration Dossier
Registration Dossier
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EC number: 250-807-9 | CAS number: 31795-24-1
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Adsorption/desorption: Low potential for adsorption. Log Koc for silanol product = -0.2 (predicted).
Key value for chemical safety assessment
Additional information
The substance is a salt that is only stable in aqueous solution at high pH (>12). In solution at pH 9 or below and at low concentration (conditions relevant for the environment), methylsilanetriol will predominate. Methylsilanetriol has a low log Kow value (<3) and therefore has low potential for adsorption and the requirement for conducting an adsorption/desorption study is waived.
For environmental exposure assessment, adsorption is predicted for methylsilanetriol using the ‘non-hydrophobics’ log Kow based prediction method for log Koc developed by Sabljić 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 methylsilanetriol = -0.2.
Reference:
Sabljić 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.
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