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EC number: 202-049-5
CAS number: 91-20-3
Calculated PNECsediment of 67.2 μg/kg for freshwater.
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
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
Union Risk Assessment Report NAPHTHALENE [CAS No: 91-20-3; EINECS No:
202-049-5] RISK ASSESSMENT European Communities, 2003
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.
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