Registration Dossier
Registration Dossier
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EC number: 267-053-1 | CAS number: 67784-78-5
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.095 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.3 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.009 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 100 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 18 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 1.8 mg/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:
- 99 mg/kg soil dw
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential to cause toxic effects if accumulated (in higher organisms) via the food chain
Additional information
WS400128 is a UVCB substance with a water solubility below 0.1 mg/l. The substance forms dispersions in water. All aquatic toxicity studies were performed with Water Accomodated Fractions (WAF) that finally were dispersions of the substance. All NOEC values determined in the aquatic toxicity tests were well above the actual water solubility of WS400128. WS400128 is not classified as hazardous to the environment.
In the biodegradation test ready biodegradability of WS400128 could not be demonstrated, but part of the substance was degraded. The UVCB substance WS400128 is a mixture of fatty acid esters with molecular weights ranging from approx. 360 D to 940 D. The substance forms dispersions in water which reduces the bioavailability of the molecules. It is rather likely that this reduced bioavailability of the fatty acid esters prevented their (ready) biodegradation in the standard test.
Based on the chemical composition of WS400128, i.e. fatty acid esters with triethanolamine, it is to be expected that the esters are hydrolysed in biological systems. Toxicity and metabolism of the hydrolysis products are already well characterized showing very low toxicological potentials and no bioaccumulation potential.
Conclusion on classification
The results of all ecotoxicological tests do not warrant any classification with regard to environmental hazards according to Regulation (EC) 1272/2008.
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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