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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 2.4 µg/L
- Assessment factor:
- 50
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 20 µg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 2.4 µg/L
- Assessment factor:
- 50
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 2.9 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 67.2 µg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 67.2 µg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 53.3 µg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Conclusion on classification
- as R50 (very toxic to aquatic organisms) and R53 (may cause long-term adverse effects in the aquatic environment) (according to 67/548/EEC or 1999/45/EC);
- Aquatic acute 1, H400: Very toxic to aquatic life; aquatic chronic 1, H410: Very toxic to aquatic life with long lasting effects. (according to CLP-Regulation (EC) No 1272/2008).
Naphthalene has been classified
1. The large majority of the LC/EC50 results from aquatic short-term tests range from 1 to 10 mg/L. In solitary cases only, the toxicity value is lower than 1, however close to one. This suggests that in essence classification for acute toxicity is not warranted according to CLP-Regulation(EC) No 1272/2008.
2. Most of the findings for naphthalene reported from reliable long-term investigations support the view that the most robust NOECs in water are above 0.1 mg/L. Furthermore, naphthalene proved to be readily biodegradable in a standard ready test, while showing rapid biodegradability in numerous other water test systems. This virtually would justify to allocate naphthalene to the Category Aquatic chronic 3, H412, according to CLP-Regulation(EC) No 1272/2008 rather than to Cat. Aquatic chronic 1.
3. However, the lowest but not verifiable value for a long-term endpoint(NOEC/EC10) is reported to be at 0.020 mg/L, i.e. at least above 0.01 mg/L. This - in combination with the biodegradation properties - would result in Category Aquatic chronic 2, H411.
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.
