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Ecotoxicological information

Sediment toxicity

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Description of key information

The NOEC, EC10 and EC50 values determined in this study were all ≥27.4 mg Pd kg-1 dw, for all endpoints (emergence rate, development time and rate, and sensitivity of the sexes).

Key value for chemical safety assessment

Additional information

Available ecotoxicity data for palladium substances indicates that palladium substances with a chloro ligand are more toxic than those without a chloro ligand. For palladium a single, worst case PNEC value has been derived for each environmental compartment, to cover all palladium substances. The PNEC has been derived based on the most toxic palladium substance, diamminedichloropalladium. Therefore, although toxicity results for diamminedicloropalladium are likely to overestimate the toxicity of palladium substances that do not contain a chloro ligand, this data is included in the dossiers for all palladium substances as it was taken into account in PNEC derivation. A study was conducted with the sediment-dwelling organism Chironomus riparius, in a sediment-water system with spiked sediment, for the test substance diamminedichloropalladium (Simon 2013). The study followed OECD guideline 218 and eight spiked sediment concentrations were used. The highest test concentration (nominal 30 mg Pd kg-1dw) was the highest possible test concentration for a real spiked sediment test design. Analysis of sediment concentrations was conducted at test start and test end and results are based on mean measured concentrations. The NOEC, EC10 and EC50 values determined in this study were all ≥27.4 mg Pd kg-1dw, for all endpoints (emergence rate, development time and rate, and sensitivity of the sexes).