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Sediment toxicity

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Description of key information

The substance hydrolyses rapidly and its hydrolysis product has a log Kow< 3. Therefore, partitioning to the sediment compartment is expected to be minimal. In accordance with Annex XI, Section 3, exposure of aquatic organisms to trimethoxyphenylsilane is not significant (RCR << 1).

Furthermore, long-term sediment toxicity studies are not required for Annex IX substances under the REACH Regulation.

Key value for chemical safety assessment

Additional information

In accordance with Annex XI, Section 3, exposure of aquatic organisms to trimethoxyphenylsilane is not significant. Furthermore, the hazard assessment based on acute aquatic toxicity data shows no toxicity toward aquatic organisms of all three trophic levels (all acute effect values, i.e. E(L)C50s were > 100 mg/L). The substance is well soluble and thus, greater toxicity in long-term tests is unlikely. Even though no hazard was identified in acute aquatic studies, PNECs were derived for the purpose of risk characterization, using the threshold value of 100 mg/L in combination with standard safety factors as outlined in ECHA guidance R.10. As the substance hydrolyses rapidly, the environmental hazard assessment, PNEC derivation and risk characterization is based on the silanol hydrolysis product following a worst case approach. The other hydrolysis product, methanol, is known for its absence of environmental toxicity. The risk characterization for the silanol hydrolysis product indicated no risk to the aquatic environment (RCR < < 1). For detailed information on the risk assessment please see the attached documentation.