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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The 3-hour EC50 was determined to be 12.56 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 tetraammine palladium hydrogen carbonate, another Pd(II) substance without a chloro ligand, is therefore considered to be appropriate for this substance. An activated sludge respiration inhibition test is available for tetraammine palladium hydrogen carbonate, conducted according to OECD guideline 209 (Mead and Worth 1995). Five test concentrations were used, and the rate of respiration was determined after 30 minutes and 3 hours contact time and compared to data from a control and a reference item. The 3-hour EC50 was determined to be 35 mg test item L-1 (12.56 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 diamminedichloropalladium 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.