Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

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

Marine water

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

STP

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

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
33 mg/kg sediment dw
Assessment factor:
1
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
33 mg/kg sediment dw
Assessment factor:
1
Extrapolation method:
equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:
hazard related to composition of atmosphere identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
4.8 mg/kg soil dw
Assessment factor:
1
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

PNECs were derived for freshwater, saltwater, sediment, and soil using the equation underlying the Petrotox model or equilibrium partitioning calculations.

Conclusion on classification

Experimental data on the acute toxicity of benzene to algae, Daphnia and fish are available. The lowest reported acute effect concentration is 5.3 mg/L for fish. This value would not result in a classification for acute hazard to the environment.

Benzene has been shown to be readily biodegradable and has a measured log kow of 2.13 indicating that it is not expected to be bioaccumulative. Taken together with the acute toxicity results, these results would not result in a classification for chronic hazard to the environment.

Benzene does not have an environmental classification under EC Directive 67/548/EEC. Benzene would not receive an environmental classification under the CLP Regulations.

However, on 10thMarch 2011 Commission Regulation (EC) No 1272/2008 [CLP Regulations] was amended. The new criteria for environmental classification state that if chronic data is available this should be used to determine the chronic classification. Benzene has a complete chronic data set. The lowest chronic effect is a 32 day NOEC of 0.8 mg/Lfor the fish species, Pimephales promelas.Since benzene is readily biodegradable, this results in a chronic Category 3 classification under the CLP Regulations.