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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The 48-hour EC50 was determined to be 0.047 mg Pd L-1.

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. Read across from tetraamine palladium hydrogen carbonate, another Pd(II) substance without a chloro ligand, is therefore considered to be appropriate for this substance. An acute Daphnia magna study is available for tetraammine palladium hydrogen carbonate, conducted according to OECD guideline 202 (Wetton 1997). Nine test concentrations were used, and the test solutions were analysed at 0 and 48 hours. Due to the variability in measured concentrations, results were based on time weighted mean measured concentrations. The 48-hour EC50 was determined to be 0.13 mg tetraammine palladium hydrogen carbonate L-1 (0.047 mg Pd L-1).

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.