Registration Dossier
Registration Dossier
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EC number: 203-678-8 | CAS number: 109-53-5
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
No data
Key value for chemical safety assessment
Additional information
In Annex X, Section 9.5.1, Column 2 of Regulation (EC) No 1907/2006, it is laid down that long-term toxicity testing on sediment organisms shall be proposed by the registrant or may be required by the Agency if the chemical safety assessment indicates the need to investigate further the effects of the substance or of relevant transformation and degradation products on sediment organisms.
The REACH Guidance Document R.7b (ECHA, 2017), Section R.7.8.14.2 states that the main property of a substance that triggers the assessment for the sediment compartment or the potential to adsorb or bind onto sediment. Further triggers for a sediment assessment are also given in R.7.8.7. A log Kow of 3 should be used as trigger value for a sediment assessment. For substances exceeding this trigger value, the availability of existing sediment toxicity data should be checked. In the absence of any (acceptable) sediment tests, the equilibrium partitioning method can be applied as a first screen.
For substances with a log Kow between 3 and 5, this screening assessment results in the same risk characterisation ratio for sediment as for the pelagic compartment, as both PECsediment and PNECsediment screening are modelled from the corresponding pelagic data using the same partitioning coefficient.
Isobutyl vinyl ether has a measured log Kow of 3.07 (see IUCLID Ch. 4.7). The log Kow is just slightly larger than 3, but still significantly smaller than the critical value of 5. The estimated log Koc is < 3 (see IUCLID Ch. 5.4.1). No cationic and surface-active properties are given. It can be concluded that no significant adsorption potential is indicated; hence, an adsorption to activated sludge, suspended matter or sediment particles is unlikely. As a consequence, a transfer to the sediment compartment is not expected.
For substances being considered as „readily biodegradable“, it can be assumed that they will be biologically degraded within the STP-process. In special cases, if the substance is not entering the STP-process but is readily biodegradable, it can be assumed that it will be rapidly biologically degraded in the surface water. In addition, the substance hydrolyses rapidly at neutral and acidic conditions (see IUCLID Ch. 5.1.2). Consequently, a transfer to the sediment compartment is unlikely. The substance is not a PBT/vPvB substance.
As sediment is not an environmental compartment of concern, no test on sediment toxicity is performed. The equilibrium partitioning method has been used for assessing the hazard to sediment organisms.
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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