Registration Dossier

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.