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Sediment toxicity

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Description of key information

Key value for chemical safety assessment

Additional information

In accordance with Column 2 of REACH Annex X, there is no need to further investigate the effects of this substance in a long-term toxicity to sediment dwelling organisms study because, as indicated in guidance R.7.8.14 (ECHA 2016), the quantitative chemical safety assessment (conducted according to Annex I of REACH) indicates that the Risk Characterisation Ratio is below 1 and therefore the risk is already adequately controlled and further testing is not justifiable.

 

PNECsediment for both the parent substance and the silanol hydrolysis product have been calculated from the aquatic data on the basis of the equilibrium partitioning method.

 

The parent substance is susceptible to degradation by hydrolysis. The silanol hydrolysis product is not readily biodegradable but has low potential for bioaccumulation and low bioavailability (based on log Kow <3 (1.1)), and there is no reason to expect any specific mechanism of toxicity beyond narcosis.

 

The PNEC calculated by Equilibrium Partitioning has been derived for the purpose of chemical safety assessment and the risk characterisation ratios are below 1.

 

Overall it is concluded that the risk characterisation conclusion is sufficiently conservative in respect of any uncertainties and therefore further testing is not considered necessary.

 

Details on how the PNEC and the risk characterisation ratio have been derived can be found in IUCLID Section 6.0 and Chapters 9 and 10 of the Chemical Safety Report, respectively.