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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

The EC50, EC10 and NOEC were determined to be 30.7 µg Pd L-1, 14.6 µg Pd L-1and 9.1 µg Pd L-1, respectively.

Key value for chemical safety assessment

Additional information

Classification of poorly soluble metal substances is conducted by comparing the results from 7 and 28-day TD tests against acute and chronic environmental reference values (ERVs). For palladium substances the ERVs are based on ecotoxicity data for diamminedichloropalladium, as the most toxic palladium substance. Environmental classification is determined by comparing the ecotoxicity results for diamminedichloropalladium against the TD test results for the substance. An activated sludge respiration inhibition test was conducted with diamminedichloropalladium and the EC50, EC10 and NOEC were determined to be 30.7 µg Pd L-1, 14.6 µg Pd L-1and 9.1 µg Pd L-1, respectively (Muckle 2012). The result was determined in a study following OECD guideline 209, with five test concentrations and a positive control included.