Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.027 µg/L
Assessment factor:
50
Extrapolation method:
assessment factor

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.003 µg/L
Assessment factor:
500
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
1.46 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
0.274 mg/kg sediment dw
Assessment factor:
100
Extrapolation method:
assessment factor

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.027 mg/kg sediment dw
Assessment factor:
1 000
Extrapolation method:
assessment factor

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
0.012 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential to cause toxic effects if accumulated (in higher organisms) via the food chain

Additional information

REACH endpoints for this substance are filled using read across from the worst-case soluble palladium substance, diamminedichloropalladium, and environmental classification is determined by comparison of these results with TD test results.

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. 

Conclusion on classification

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. The acute and chronic ERVs for diamminedichloropalladium are 2.96 and 1.3 µg Pd L-1, respectively (based on algal EC50 and NOEC values). The results of the definitive TD test with palladium monoxide powder showed 0 µg Pd L-1after 7 days at loading rates of 10 and 100 mg L-1, or after 28 days at a loading rate of 1 mg L-1. As the TD test result is not above the acute or chronic ERV, palladium monoxide is not classified for the environment.