Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.022 mg/L
Assessment factor:
50
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
0.26 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.002 mg/L
Assessment factor:
500
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
10 mg/L
Assessment factor:
100
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
0.158 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.016 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
0.019 mg/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

Acute toxicity:

Algae is the most sensitive species to the acute toxic effects of the test item with an acute ErC50 of 26 mg/L. Thus, the substance has not to be classified for acute aquatic toxicity according to Directive 67/548/EEC (DSD) and Regulation (EC) No 1272/2008 (CLP/GHS).

Chronic toxicity:

Fish was the most insensitive species in the acute toxicity. Chronic data are available for algae (NOErC of 6 mg/l) and daphnia (NOEC of 1.1 mg/l and 2.6 mg/l for the read across to analogue substance n-butyl methacrylate). The read across substance show a higher toxicity to fish, daphnia and algae in the acute tests, therefore the read across is conservative approached. t-Butyl methacrylate is not ready biodegradable, but ready biodegradable under enhanced conditions according to OECD criteria. The acute toxicity data are > 10 100 mg/l. Whereas the chronic data of the most sensitive species are > 1mg/l.

Thus, the substance has not to be classified for chronic acute toxicity according to Directive 67/548/EEC (DSD) and Regulation (EC) No 1272/2008 (CLP/GHS).