Registration Dossier
Registration Dossier
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EC number: 287-502-5 | CAS number: 85536-20-5
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.327 mg/L
- Assessment factor:
- 1
- Extrapolation method:
- sensitivity distribution
- PNEC freshwater (intermittent releases):
- 0.327 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.327 mg/L
- Assessment factor:
- 1
- Extrapolation method:
- sensitivity distribution
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 6.58 mg/L
- Assessment factor:
- 1
- Extrapolation method:
- sensitivity distribution
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 12.46 mg/kg sediment dw
- Assessment factor:
- 1
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 12.46 mg/kg sediment dw
- Assessment factor:
- 1
- 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:
- 2.31 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 Petrotox model or equilibrium partitioning calculations.
Conclusion on classification
The lowest 96hr LC50 for fish is 2.6 mg/l. The lowest 48hr EC50 forDaphnia magnais 3.62 mg/l. The lowest 72 or 96hr ErC50 for algae is 3.2 mg/l. However, a 24hr EC50 forDaphnia magnaof 1 mg/l is reported for o-xylene. A second study with o-xylene reports a 48hr EC50 of 3.82 mg/l forDaphnia magna. Both these studies with the same test organism are considered valid. None of the LC or EC50 from the acute ecotoxicity tests conducted with the xylene isomersor ethylbenzeneare less than 1 mg/L.
Data on the xylene isomers and ethylbenzene indicates that biodegradation is rapid, and that they will partition to the air from water, further reducing their potential for exposure. An experimentally determined BCF for mixed xylenes in fish gave a result of 29, indicating a low potential for bioaccumulation. Taken together with the acute toxicity results, these results would not result in a classification for acute or chronic hazard to the environment for the streams in this category.
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. This category has a complete chronic data set, read across from the xylene isomers and ethyl benzene. The lowest chronic effect is a 72 hour NOEC of 0.44 mg/Lfor algae.This results in a chronic Category 3 classification under the CLP Regulations. This has been added as a self classification to the dossier.
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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