Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

The standard approach for assessing poorly soluble metal substances is to read across ecotoxicity data from a soluble form of the metal, taking the lowest acute and chronic test results as the environmental reference values (ERV) and comparing these against the result from a transformation / dissolution study. Classification is determined based on the concentration analysed in a transformation dissolution test after 7 and 28 days, compared to the acute and chronic ERVs, respectively.

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.