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Short-term toxicity to aquatic invertebrates

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Description of key information

The 48-hour EC50 was determined to be 1.7 mg test item L-1.

Key value for chemical safety assessment

Additional information

An acute Daphnia magna study Is available for palladium dinitrate following OECD guideline 202 (Enste-Diefenbach 2004). Nine test concentrations were used and these were analysed using ICP-OES. Flocculated material was observed and was dissolved by concentrated hydrochloric acid before analysis. Results were based on geometric mean values of analytically determined concentrations at test start and after 48 hours. The 48-hour EC50 was determined to be 1.7 mg test item L-1. Dark brown flocculate was observed in the test solutions at 24 and 48 hours, therefore it is assumed that this may also have contributed to the toxicity.

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 substance as it was taken into account in PNEC derivation.