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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

Slags, lead-zinc smelting  have been tested for a) acute ecotoxicity on algae, daphnids and fish, and b) chronic toxicity on daphnids and algae. All the test results demonstrate the lack of aquatic toxicity of this substance, also according to EU classification criteria. 
Transformation/dissolution testing on slag according to OECD standard protocol showed that the substance releases not sufficient zinc ions to exceed classification levels for acute and chronic toxicity at pH 6 and pH 8.
Finaly, fish are as a rule less sensitive to the zinc ion than the invertebrates and algae, as observed in the datasets on soluble zinc compounds. For these reasons, chronic testing of slag on fish was not considered relevant and is waived.

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Additional information

Slags, lead-zinc smelting have been tested for a) acute ecotoxicity on algae, daphnids and fish, and b) chronic toxicity on daphnids and algae. All the test results demonstrated the lack of aquatic toxicity of this substance, also according to EU classification criteria.

Transformation/dissolution testing on slag according to OECD standard protocol showed that the substance releases not sufficient zinc ions to exceed classification levels for acute and chronic toxicity at pH 6 and pH 8.

Finaly, fish are as a rule less sensitive to the zinc ion than the invertebrates and algae, as observed in the datasets on soluble zinc compounds.

For these reasons, chronic testing of slag, lead-zinc smelting on fish (vertebrates) is not considered relevant and is waived.