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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Link to relevant study record(s)

Reference
Endpoint:
bioaccumulation in aquatic species: fish
Data waiving:
study scientifically not necessary / other information available
Justification for data waiving:
other:

Description of key information

Low potential for bioaccumulation.

Key value for chemical safety assessment

Additional information

The parent substance as well as the hydrolysis products have a low potential for bioaccumulation (log Kow < 3).

No experimental studies are available investigating the bioaccumulation of dimethoxydimethylsilane (CAS 1112-39-6). Dimethoxydimethylsilane hydrolyses rapidly to dimethylsilanediol and methanol under environmental conditions (DT50 < 0.6 h at pH 7, pH 9 and 25 °C). Thus the bioaccumulation assessment is based on the hydrolysis products i.e. dimethylsilanediol and methanol rather than the parent substance. Both hydrolysis products have low log Pow values indicating a low potential for bioaccumulation (dimethylsilanediol: -0.41, methanol: -0.74 (OECD SIDS, 2004)). Thus, in accordance with Annex IX, 9.3.2., column 2 no study needs to be conducted since the log Pow is well below 3 and bioaccumulation is not expected.