Registration Dossier
Registration Dossier
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 204-617-8 | CAS number: 123-31-9
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.57 µg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 1.34 µg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.057 µg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 0.71 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 4.9 µg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.49 µg/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:
- 0.64 µg/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
Short-term E/LC50 values are available for algae (growth rate 72hEC50 = 0.330 mg/L), daphnia (48hEC50 = 0.134 mg/L) and fish (96hLC50 = 0.638 mg/L) based on measured initial concentrations. The lowest EC50 is obtained in the daphnia immobilisation test showing that the substance is very toxic to the aquatic organisms and that the acute M factor should be 1. However, based on the official classification, the acute M factor is considered to be 10.
Additionally, Hydroquinone is readily biodegradable and due to the log Kow <3 there is no tendency to bioaccumulate. Chronic toxicity data are available for fish, daphnia and algae showing a 32d NOEC of 0.1 mg/L (corresponding to 0.066 mg/L in mean measured concentration), a 21d NOEC of 0.0057 mg/L and a 72hNOEC = 0.019 mg/L respectively. Based on this information, Hydroquinone is very toxic to aquatic life with long lasting effects with a chronic M factor of 1.
This results in a classification of:
Aquatic acute 1, H400
Multiplication factor for mixtures: 10
Aquatic chronic 1, H410
Multiplication factor for mixtures: 1
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
