Registration Dossier
Registration Dossier
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EC number: 231-176-9 | CAS number: 7440-67-7
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.074 mg/L
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.74 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.007 mg/L
- Assessment factor:
- 10 000
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- no data: aquatic toxicity unlikely
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 74.6 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 7.5 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for air
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 7 mg/kg soil dw
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
As no toxic effect has been observed in all the tests performed on Zirconium compounds, only unbound PNEC value could be derived. There are clearly overestimating the hazard that may present Zirconium substance to aquatic, benthic or terrestrial organisms. However, for the purpose of REACH and Chemical Safety Assessment, they will be considered in this dossier as conservative PNEC.
Conclusion on classification
For Zr metal, no Acute 1/Chronic 1, 2, 3 classification category under CLP is proposed as no acute toxicity was observed to aquatic organisms at loading rate. Even if for fish, the loading rate was 74 mgZr/L (unbound NOEC>= 74 mgZr/L) no effect is expected at 100 mgZr/L as for algae and invertebrates (loading rates > 100 mgZr/L).
Furthermore, as Zr is insoluble in water, no chronic toxicity is expected for aquatic organisms as the substance will not be bioavailable.
Therefore, there is no need for an environmental classification of Zr metal.
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