Registration Dossier
Registration Dossier
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EC number: 430-750-8 | CAS number: -
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 1 mg/L
- PNEC freshwater (intermittent releases):
- 1 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 1 mg/L
- PNEC marine water (intermittent releases):
- 1 mg/L
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 10 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 1 384 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 1 384 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:
- 275.2 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
PNEC freshwater sediment:
K_(susp-water) = 346 m3/m3
RHO_(susp) = 1150 kg/m3
Conversion factor (wwt -> dwt): 4.6
PNEC_freshwater sediment = (K_(susp-water)/ RHO_(susp))*PNEC_fresh water * 1000
= (346/1150)* 1.0 *1000
= 300.8 mg/kg wwt
= 1384.0 mg/kg dwt
PNEC marine water sediment:
K_(susp-water) = 346 m3/m3
RHO_(susp) = 1150
Conversion factor (wwt -> dwt): 4.6
PNEC_marine water sediment = (K_(susp-water)/ RHO_(susp))*PNEC_marine water* 1000
= (346/1150)* 1.0 * 1000
= 300.8 mg/kg wwt
= 1384.0 mg/kg dwt
PNEC soil:
K_(soil-water) = 414 m3/m3
RHO_(soil) = 1700 kg/m3
Conversion factor (wwt -> dwt): 1.13
PNEC_soil = (K_(soil-water)/ RHO_(soil))*PNEC_fresh water * 1000
= (414/1700)* 1.0 * 1000
= 243.5 mg/kg wwt
= 275.2 mg/kg dwt
Conclusion on classification
According to the aquatic toxicity data no hazard was detected for all three trophic levels as well as for microorganisms. But as Urea 4 is highly insoluble in water, has a log Pow greater or equal than 6 and is not readily biodegradable it needs to be classified as long term (chronic) aquatic toxicity Cat. 4 (H413: May cause long lasting harmful effects to aquatic life), but not for short term (acute) aquatic toxicity according to Regulation (EC) No 1272/2008, as amended for the eighteenth time in Regulation (EU) 2022/692.
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