Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
20.6 µg/L
Assessment factor:
1
Extrapolation method:
sensitivity distribution

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
6.1 µg/L
Assessment factor:
1
Extrapolation method:
sensitivity distribution

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
100 µg/L
Assessment factor:
1
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
117.8 mg/kg sediment dw
Assessment factor:
1
Extrapolation method:
sensitivity distribution

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
56.5 mg/kg sediment dw
Assessment factor:
1
Extrapolation method:
equilibrium partitioning method

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
35.6 mg/kg soil dw
Assessment factor:
1
Extrapolation method:
sensitivity distribution

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Results from transformation/dissolution tests and acute aquatic toxicity testing demonstrate that slags, lead-zinc smelting have very limited solubility. As such, the substance is not classified for aquatic toxicity, and the results from eco-toxicity testing on soluble zinc compounds are not relevant for slags, lead-zinc smelting

However, a basic assumption made in the hazard assessment of zinc compounds (in accordance to the same assumption made in the EU RA process) is that the ecotoxicity of zinc and zinc compounds is due to the Zn++ion. Therefore, the PNECs as derived for the soluble zinc compounds (zinc ion related) are also relevant for the insoluble slags, lead-zinc smelting, because they are expressed as “zinc ion”, not as the test compound. It is emphasised that the aquatic toxicity test results obtained on soluble zinc compounds are not relevant for slags, lead-zinc smelting.

Conclusion on classification

Based on the results from

a) transformation /dissolution tests, demonstrating that slags, lead-zinc smelting are insoluble to such extent that the concentration of zinc and other metal ions in standard aqueous media loaded with 100mg/l of slags, lead-zinc smelting is lower than the reference value for aquatic toxicity of zinc at pH 6 and pH 8, and

b) aquatic toxicity tests on fish, invertebrates and algae showing also that slags, lead-zinc smelting loading of 100mg/l does not result in any aquatic toxicity effect,

Slags, lead-zinc smelting is not classified for environmental effects.