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EC number: 241-883-4 | CAS number: 17958-73-5
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.13 mg/L
- Assessment factor:
- 50
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 1 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.013 mg/L
- Assessment factor:
- 500
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 1 mg/L
- Assessment factor:
- 100
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 130.5 mg/kg sediment dw
- Extrapolation method:
- equilibrium partitioning method
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 13.05 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:
- 3 mg/kg soil dw
- Assessment factor:
- 1 000
- Extrapolation method:
- assessment factor
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
PNEC sediment using Equilibrium Partitioning Method
The formula for the PNEC sediment calculation involves the same factors in both the cases of fresh-water (fs) and marine water (mw) sediments, except for the PNEC variable, which is water type related.
PNECfs/mw sed= (Ksusp-water/RHOsusp)*PNECfs/mw water*1000
Where:
| PNECfresh-water | Predicted No Effect Concentration in fresh-water | [mg/l] | 0.13 |
| PNECmarine water | Predicted No Effect Concentration in marine water | [mg/l] | 0.013 |
| RHOsusp | bulk density of wet suspended matter | [kg/m3] | 1150 |
| Ksusp water | partition coefficient suspended matter water | [m3/m3] | 251 |
| PNECfs sed | Predicted No Effect Concentration in sediment | [mg/kg of wet sediment] | 28.37 |
| PNECmw sed | Predicted No Effect Concentration in sediment | [mg/kg of wet sediment] | 2.837 |
Ksusp water= Fwatersusp+ Fsolidsusp*Kpsusp/1000*RHOsolid
Kpsusp= Focsusp*Koc
The value of Ksusp-water of 251 is based on the representative Log Koc = 4 used for the category.
PNEC fw sediments = (251/1150)*0.13*1000 = 28.37 mg/kg wwt
PNEC mw sediments = (251/1150)*0.13*1000 = 2.837 mg/kg wwt
The PNECsfw/mw sed obtained are wet weight basis, thus the PNECs are recalculated to dry sediment using the conversion factor for sediments of 4.6; therefore, the PNEC fresh-water sediment resulted 130.5 mg/kg dw and the PNEC marine water resulted 13.05 mg/kg dw.
PNEC soil using Equilibrium Partitioning Method
The following formula is applied:
PNECsoil= (Ksoil-water/RHOsoil)*PNECwater*1000
Where:
| PNECfresh-water | Predicted No Effect Concentration in fresh-water | [mg/l] | 0.13 |
| RHOsusp | bulk density of soil | [kg/m3] | 1700 |
| Ksoil water | partition coefficient soil water | [m3/m3] | 300 |
| PNECsoil | Predicted No Effect Concentration in soil | [mg/kg of wet sediment] | 22.94 |
Ksoil water= Fairsoil*Kair-water+Fwatersoil+ Fsolidsoil*Kpsoil/1000*RHOsolid
Kpsoil= Focsoil*Koc
PNEC soil = (300/1700)*0.13*1000 = 22.94 mg/kg wt
The PNEC sediment obtained is wet weight basis, thus the PNEC has been recalculated to dry sediment using the conversion factor for sediments of 1.13; therefore thePNEC soil resulted 25.92 mg/kg dw
The most conservative PNEC soil value of 3 mg/kg dw based on the acute experimental tests has been selected for Risk Assessment.
Conclusion on classification
The available experimental data are adequate for the evaluation of the classification and labelling according to the CLP Regulation EC 1272/2008 and related amendments.
Biodegradation in water: not rapidly biodegradable
Log Kow: < 0 (non bioaccumulative)
Acute toxicity:
- to Fish: LC50 (96h) > 100 mg/l
- to Algae EC50 (72h) > 100 mg/l
- to Crustacean EC50 (48h) > 100 mg/l
Chronic toxicity:
- to Crustacean NOEC (21d) = 6.59 mg/l
Classification justification according to CLP:
Based on the data above, CAS 17958-73-5 is determined to be not rapidly degradable. No acute aquatic toxicity was observed. Valid chronic toxicity data are available for Daphnia – NOEC (21 d) > 1 mg/l. Therefore CAS 17958-73-5 is not classified for the environment according to the Regulation (EC) No.1272/2008 (CLP) and the Regulation (EU) No. 286/2011 (2nd ATP).
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