Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.015 mg/L
Assessment factor:
1
Extrapolation method:
sensitivity distribution
PNEC freshwater (intermittent releases):
0.015 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.015 mg/L
Assessment factor:
1
Extrapolation method:
sensitivity distribution

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
0.233 mg/L
Assessment factor:
1
Extrapolation method:
sensitivity distribution

Sediment (freshwater)

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

Sediment (marine water)

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

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential to cause toxic effects if accumulated (in higher organisms) via the food chain

Additional information

PNECS were derived for freshwater, saltwater, sediment, soil and micro-organisms using the HC5 model plus statistical extrapolation or equilibrium partitioning calculations.

The information gathered indicates that 2,4,4-trimethylpentene is of low toxicity to environmental receptors. In the PBT assessment, none of the studies evaluated exceed the acute LC50 toxicity (T) screening criteria of <0.1 mg/L. A further evaluation of the data on the basis of the available NOECs indicates that the criteria in Annex XIII of <0.01 mg/L for toxicity to aquatic organisms (fresh and marine) is not exceeded in the invertebrate study which reported a NOEC of 0.16 mg/L. These values indicate that the toxicity criteria stipulated in Annex XIII would not be met. Therefore, 2,4,4-trimethylpentene is not considered to be T on the basis of the environmental screening criterion and there is evidence that the criterion stipulated in Annex XIII is also not met.

Conclusion on classification

The most conservative values reported are 0.58 mg/L for acute toxicity to fish and 0.16mg/L for the 21 day NOEC for chronic toxicity to aquatic invertebrates. This would result in a category 1 acute and chronic hazard to the environment with hazard statement 'very toxic to aquatic life with long lasting effects' in the classification and labeling assessment. The M factor would be 1.