Registration Dossier
Registration Dossier
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EC number: 201-969-4 | CAS number: 90-15-3
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.33 µg/L
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 3.3 µg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.033 µg/L
- Assessment factor:
- 10 000
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 1.2 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 16.6 µg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 1.66 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:
- 3.11 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
1-Naphthol has a harmonized classification (Index no. 604-029 -00 -5). 1-Naphthol does not have a harmonized classificication for environment (neither acute nor chronic).
Three acute endpoints for three different trophic levels are available. The lowest LC50 is found for fish and is 0.33 mg/L.
Two chronic endpoints are available.
One chronic endpoint for algae is available. The ErC10 > 2.18 mg/L.
1-Naphthol tested in a 21-day Daphnia magna study gave a NOEC 0.25 mg/L (reproduction rate).
The substance is readily biodegradability and has a low log Kow of 2.84.
Acute endpoint for fish is 0.33 mg/L, therefore under Regulation (EU) No 286/2011 (2nd ATP to CLP) 1-Naphthol should be classified Category Acute 1, M-factor = 1.
The substance is readily biodegradable and the chronic NOEC for Daphnia magna is 0.25 mg/L. 1-Naphthol should be classified Category Chronic 3.
Proposal for classification: Category Acute 1, M-factor = 1; Category Chronic 3.
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