Registration Dossier
Registration Dossier
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EC number: 273-723-4 | CAS number: 69012-24-4 Electrolytic solution from electrolysis of zinc sulfate consisting primarily of zinc sulfate, manganese oxides and sulfuric acid.
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- PNEC aqua (freshwater)
- PNEC value:
- 0.034 mg/L
- Assessment factor:
- 50
- Extrapolation method:
- assessment factor
- PNEC freshwater (intermittent releases):
- 0.028 mg/L
Marine water
- Hazard assessment conclusion:
- PNEC aqua (marine water)
- PNEC value:
- 0.003 mg/L
- Assessment factor:
- 500
- Extrapolation method:
- assessment factor
STP
- Hazard assessment conclusion:
- PNEC STP
- PNEC value:
- 100 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
Sediment (freshwater)
- Hazard assessment conclusion:
- PNEC sediment (freshwater)
- PNEC value:
- 3.3 mg/kg sediment dw
- Assessment factor:
- 500
- Extrapolation method:
- assessment factor
Sediment (marine water)
- Hazard assessment conclusion:
- PNEC sediment (marine water)
- PNEC value:
- 0.34 mg/kg sediment dw
- Assessment factor:
- 5 000
- Extrapolation method:
- assessment factor
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- PNEC soil
- PNEC value:
- 3.4 mg/kg soil dw
- Assessment factor:
- 500
- Extrapolation method:
- assessment factor
Hazard for predators
Secondary poisoning
- Hazard assessment conclusion:
- no potential for bioaccumulation
Additional information
Aquatic
A standard acute toxicity study with Daphnia was conducted with manganese metal as a limit test at 100% v/v saturated solution (equivalent to 1.6 mg/l) and showed no effects. Therefore the 48 Hour EC50 was greater than 1.6 mg/l, and the NOEC was 1.6 mg/l. A standard acute toxicity study with fish was conducted with Mn metal as a limit test at 100% v/v saturated solution and showed no effects. Therefore the 96 Hour LC50 was greater than 100 %v/v and the NOEC was 100 %v/v (equivalent to 3.6 mg/l). A standard chronic study on Algae resulted in 72h ECr50 4.5 mg/l, ECy50 of 2.8 mg/l and NOEC of 2.5 mg/l. An 8 day chronic study on Daphnia gave NOEC = 1.7 mg/l.
It should be noted that these values are similar to the background concentration of manganese in European environments (15.9 µg Mn/L in surface water; “Probabilistic Distribution of Manganese in European Surface Water, Sediment and Soil and Derivation of Predicted Environmental Concentrations (PEC)”, Parametrix, 2009 and supported by GEMAS data) and hence have limited relevance for assessment of any potential risk from Mn metal.
Sediment
No experimental data on sediment toxicity exist. The data are not required as the hazard assessment performed during the chemical safety assessment concludes that the substance is not classified and is of no immediate concern to the environment.PNEC sediment is calculated by the equilibrium partitioning.
It should be noted that this value is considerably lower than the background concentration of manganese in European environments (452 mg/kg in sediment; “Probabilistic Distribution of Manganese in European Surface Water, Sediment and Soil and Derivation of Predicted Environmental Concentrations (PEC)”, Parametrix, 2009 and supported by GEMAS data) and hence has little relevance for assessment of any potential risk from Mn metal.
Terrestrial
No experimental data on terrestrial toxicity exist. The data are not required as the hazard assessment performed during the chemical safety assessment concludes that the substance is not classified and is of no immediate concern to the environment.PNEC soil is calculated by the equilibrium partitioning method. It should also be noted that this value is considerably lower than the background concentration of manganese in European environments (428.6 mg/kg in soil; “Probabilistic Distribution of Manganese in European Surface Water, Sediment and Soil and Derivation of Predicted Environmental Concentrations (PEC)”, Parametrix, 2009 and supported by GEMAS data) and hence has little relevance for assessment of any potential risk from Mn.
STP
No effects on sewage sludge were observed in a standard 3hr study on Mn. Hence the NOEC for Mn is 1000mg/l.
Conclusion on classification
In accordance with the criteria for classification as defined in Annex I, Regulation (EC) No. 1272/2008, the substance does not require classification with respect to environmental toxicity.
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