Registration Dossier
Registration Dossier
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EC number: 201-222-2 | CAS number: 79-74-3
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.32 µg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.13 µg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 32 ng/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
- PNEC marine water (intermittent releases):
- 13 ng/L
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 10 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 0.155 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 15.5 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:
- 30.8 µg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- PNEC oral
- PNEC value:
- 0.33 mg/kg food
- Assessment factor:
- 300
Additional information
Conclusion on classification
The environmental classification of 2,5-bis(1,1-dimethylpropyl)-1,4-diol is currently not harmonized according to the CLP Regulation (EC) 1272/2008.
Short-term toxicity tests resulted in L(E)C50 values below 1 mg/L for both fish (96-h LC50 = 0.013 mg/L) and daphnids (48-h EC50 = 0.91 mg/L). Long-term studies gave the following results;NOEC for freshwater fish: 3.2µg/L; NOEC for freshwater invertebrates: 11µg/L. Based on these results and due to the fact that 2,5-bis(1,1-dimethylpropyl)-1,4-diol is not readily biodegradable, this substance should be classified in Acute Category 1 and Chronic Category 1 for the aquatic environment according to Annex 1 (section 4.1.2.6) of the CLP Regulation.
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