Palladium (II) di(4-oxopent-2-en-2-oate)

Endpoint summary

Additional information

The standard approach for assessing the toxicity of metals is based on read across between soluble metal substances in the same oxidation state, taking into account any potential toxicity from ligands or counter ions where appropriate. For palladium substances, the available ecotoxicity data indicate that substances with a chloro ligand are more toxic than those without a chloro ligand. Therefore, the read across approach for palladium(II) substances is that for substances containing a chloro ligand, where toxicity data are not available for the substance itself, data are read across from another substance that also contains a chloro ligand (diamminedichloropalladium). For palladium substances without a chloro ligand, data are read across from another substance without a chloro ligand (tetraammine palladium hydrogen carbonate).

For risk assessment purposes, many sites produce and use different palladium substances, and when monitoring site emissions only the concentration of palladium is monitored. For this reason, although a specific read across approach is followed for the environmental classification of each palladium substance, a single PNEC is derived covering all palladium substances, for each environmental compartment. This allows a site to conduct a risk assessment for total emissions of palladium, rather than attempting to link a proportion of the site emissions to each palladium substance that is used. As a single palladium PNEC is derived, the PNEC is determined based on a worst case approach, using data for the most toxic palladium substance, diamminedichloropalladium.