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Long-term toxicity to aquatic invertebrates

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Description of key information

Test data is available on the acute toxicity of nickel slag and analogue substance(copper slag) to invertibrtaes.. The results demonstrate that nickel slag is not chronically toxic at the concentration tested: 48 h EC 10  >1 mg/l

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Additional information

A reliable study (De Schamphelaere, 2010) was performed on the analogue substance (copper slag) which assessed the chronic toxicity of mesocosm water extracts of five slags onBrachionus calyciforus (rotifer).The 48 h EC10 for copper slag in the range of 94 mg/l to >674 mg/l were found. Typical slag samples have been tested with composition similar to the composition of nickel slag as outlined in IUCLID Section 1.2. Given lower release of metals from nickel slag comparing to copper slag in transformation/dissolution tests in standard media , value of acute toxicity for the nickel slag 48 h EC10 of < 94 mg/l shall be predicted.

The calculated classification of nickel slag via Toxic unit approach (Higher Tier Arche CLP Tool) resulted inNo chronicclassification for the UVCB substance.

Based on this result, the related criteria provided theestimated value for chronic (long term) toxicity to aquatic invertebrate (see EU CLP Annex I Table 4.1.0):NOEC (for crustacea) >1 mg/l

Using a weight of evidence approach, the lowest short-term toxicity of nickel slag to invertebrates is greater than 1 mg/l.