Registration Dossier
Registration Dossier
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EC number: 270-750-3 | CAS number: 68477-69-0 A complex combination of hydrocarbons obtained from the distillation of the butane stream. It consists of aliphatic hydrocarbons having carbon numbers predominantly in the range of C3 through C4.
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 80 µg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 53 µg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 8 µg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
- PNEC marine water (intermittent releases):
- 5.3 µg/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:
- 1.36 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.136 mg/kg sediment dw
- 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:
- 0.225 mg/kg soil dw
- 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.
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/L for the fish species, Pimephales promelas. Since benzene is readily biodegradable, the self-classification as chronic Category 3 classification is applied under the CLP Regulations.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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