Silicomanganese manufacturing fumes dedusting solid residues

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0 mg/L

Assessment factor:

50

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0 mg/L

Assessment factor:

500

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

100 mg/L

Assessment factor:

100

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

0.014 mg/kg sediment dw

Assessment factor:

500

Extrapolation method:

assessment factor

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.001 mg/kg sediment dw

Assessment factor:

5 000

Extrapolation method:

assessment factor

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:

PNEC soil

PNEC value:

0.014 mg/kg soil dw

Assessment factor:

500

Extrapolation method:

assessment factor

Additional information

Aquatic

A standard acute toxicity study with Daphnia was conducted as a limit test at 100% v/v saturated solution (equivalent to 0.022 mg/l) and showed no effects. Therefore the 48 Hour EC50 was greater than 0.022 mg/l, and the NOEC was 0.022 mg/l. A standard acute toxicity study with fish was conducted withMn₃O₄as 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 0.022 mg/l). Similar results were obtained in a standard chronic limit test study on Algae, resulting in 72h EC50 > 100% v/v saturated solution, and NOEC = 100% v/v saturated solution. An 8 day chronic study on Daphnia gave NOEC = 33% v/v saturated solution. It should be noted that these values are much lower than 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 very limited relevance for assessment of any potential risk from Mn₃O₄

Sediment

No experimental data on sediment toxicity exist. The data are not requiredas 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 method.

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 Mn₃O₄

Terrestrial

No experimental data on terrestrial toxicity exist. The data are not requiredas 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 Mn₃O₄

STP

No effects on sewage sludge were observed in a standard 3hr study on Mn₃O₄. Hence the NOEC for Mn₃O₄is 1000mg/l.