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Environmental fate & pathways

Adsorption / desorption

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Link to relevant study record(s)

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
Reason / purpose for cross-reference:
data waiving: supporting information

Description of key information

Adsorption/desorption:

log Koc [tetramethylsilane]: 250 (calculation)

Key value for chemical safety assessment

Koc at 20 °C:
250

Additional information

The requirement to conduct an adsorption/desorption study for the substance is waived because the submission substance has a low log Kow value of <3 (predicted log Kow of 2.7).

For environmental exposure assessment, adsorption is calculated for the substance 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 tetramethylsilane is approximately 2.4

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 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.