Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 202-049-5 | CAS number: 91-20-3
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
Calculated PNECsediment of 67.2 μg/kg for freshwater.
Key value for chemical safety assessment
Additional information
There are no studies available regarding sediment toxicity of naphthalene.
According to Column 2 of REACH Annex X (standard information requirements for substances manufactured or imported in quantities of 1000 tonnes or more) of Regulation (EC) No 1907/2006 “long-term toxicity testing on sediment dwelling organisms shall be proposed by the registrant if the results of the chemical safety assessment indicates the need to investigate further the effects of the substance and/or degradation products on sediment organisms.”According to Guidance on information requirements and chemical safety assessment (Chapter R.7b: Endpoint specific guidance) substances have to be assessed for toxicity to sediment-dwelling organisms that are potentially capable of depositing on or sorbing to sediments to a significant extent.
Relevant exposure of sediments to naphthalene is unlikely regarding its use pattern. Production, handling and use of naphthalene take place in closed systems under intermediate conditions with very low releases of naphthalene to the environment or to waste water streams and with low probability of any significant release to the environment from products. Even in case of relevant exposure, toxicological long-term effects on sediment dwelling organisms can be excluded since naphthalene is easily degradable (see section 5.2 of the dossier) and therefore does not sorb to sediments to a significant extent or deposit in sediment for a longer period of time when accidentally released to the environment.
Against this background and due to the inherent properties of naphthalene, long-term toxicity testing on sediment dwelling organisms is not required under Regulation (EC) No 1907/2006 (REACH).
According to the European Risk Assessment Report on naphthalene [EU RAR], in the absence of data on the toxic effects of naphthalene on sediment dwelling organisms, it is proposed that a sediment partition method is used to calculate a PNECsediment. The PNECsed has been calculated from the PNEC for water. The equation used in the risk assessment report differs from that given in the Technical Guidance Document. It uses the suspended matter - water coefficient rather than that for sediment. For naphthalene, PNECwater is 2.4 μg/l. This gives a PNECsediment of 67.2 μg/kg for freshwater.
[EC 2003: European Union Risk Assessment Report NAPHTHALENE [CAS No: 91-20-3; EINECS No: 202-049-5] RISK ASSESSMENT European Communities, 2003 [http://ecb.jrc.ec.europa.eu/esis/]
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
