Registration Dossier
Registration Dossier
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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.
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