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Sediment toxicity

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Description of key information

Slag, lead-zinc smelting has 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, lead-zinc smelting according to OECD standard protocol showed that the substance releases not sufficient zinc ions to exceed classification levels for acute and chronic aquatic toxicity at pH 6 and pH 8.
Finaly, the limited amount of Zn ions released from the slag, lead-zinc smelting are expected to be sequestered directly into the Acid-volatile sulphide fraction of the sediment.
For these reasons, sediment toxicity testing on slag, lead-zinc smelting is waived.

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Additional information

Slag, lead-zinc smelting has 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, lead-zinc smelting according to OECD standard protocol showed that the substance releases not sufficient zinc ions to exceed classification levels for acute and chronic aquatic toxicity at pH 6 and pH 8.

Finaly, the limited amount of Zn ions released from the slag are expected to be sequestered directly into the Acid-volatile sulphide fraction of the sediment.

For these reasons, sediment toxicity testing on slag, lead-zinc smelting is waived.

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