Registration Dossier
Registration Dossier
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EC number: 220-941-2 | CAS number: 2943-75-1
Sediment toxicity
Administrative data
Link to relevant study record(s)
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 adsorption to the sediment and low potential for bioaccumulation (based on low log Koc (1.6) and 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 7, 9 and 10 of the Chemical Safety Report, respectively.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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