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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 0-24h EC50 (growth rate) was determined to be 0.027 mg Pd L-1 and the 72-hour NOEC was 0.014 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 algal study is available for tetraammine palladium hydrogen carbonate, conducted according to OECD guideline 201 (Mead 1997). Five test concentrations were used, and the test solutions were analysed. Measured concentrations ranged from <LOQ to 63% nominal. The low and variable measured concentrations are believed to be because the test concentrations were close to the LOD for the analytical method, and results are based on nominal concentrations. The 0-24h EC50 (growth rate) was determined to be 0.078 mg test item L-1 (0.027 mg Pd L-1) and the 72-hour NOEC was 0.04 mg test item L-1 (0.014 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.