Registration Dossier

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).