Registration Dossier
Registration Dossier
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EC number: 244-344-1 | CAS number: 21351-79-1
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 1.12 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.843 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.112 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 89.3 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 4.37 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.437 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:
- 0.22 mg/kg soil dw
- Extrapolation method:
- equilibrium partitioning method
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
For the calculation of the partition coefficients with EUSES a Log Pow of -1 was used as input parameter.
PNEC freshwater and marine water sediment
K_(susp-water) = 0.979
RHO_(susp) = 1150
Conversion factor (wwt -> dwt): 4.6
PNEC_freshwater sediment
= (K_(susp-water)/ RHO_(susp))*PNEC_water * 1000
= (0.979/1150)* 1.25*1000
= 1.06 mg/kg wwt
= 4.9 mg/kg dwt
The respective PNEC (freshwater sediment) for cesium hydroxide anhydrous is 4.37 mg/L (dwt) and for cesium 3.86 mg/L (dwt).
PNEC_marine water sediment
= (K_(susp-water)/ RHO_(susp))*PNEC_ marine water * 1000
= (0.979/1150)* 0.125*1000
= 0.106 mg/kg wwt
= 0.49 mg/kg dwt
The respective PNEC (marine water sediment) for cesium hydroxide anhydrous is 0.437 mg/L (dwt) and for cesium 0.38 mg/L (dwt).
PNEC soil
K_(soil-water) = 0.295
RHO_(susp) = 1700
Conversion factor (wwt -> dwt): 1.13
PNEC_soil
= (K_(soil-water)/ RHO_(soil))*PNEC_water * 1000
= (0.295/1700)* 1.25* 1000
= 0.217 mg/kg wwt
= 0.245 mg/kg dwt
The respective PNEC (soil) for cesium hydroxide anhydrous is 0.22 mg/L (dwt) and for cesium 0.19 mg/L (dwt).
Conclusion on classification
Based on the available data the test item has not to be classified according to Regulation (EC) No 1272/2008 (CLP).
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