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

Air

Hazard assessment conclusion:
no hazard identified

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 palladium(II) substance tetraammine palladium hydrogen carbonate. This data is also used for classification purposes.

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

Environmental classification is assessed based on the lowest acute and chronic values from ecotoxicity tests. For this substance, the lowest acute value is an EC50 of 0.027 mg Pd L-1for algae (growth rate), read across from tetraammine palladium hydrogen carbonate. The only chronic data available is an algal NOEC, therefore chronic classification is determined based on the acute data. For classification purposes, this value has been expressed as the concentration of tetraammine palladium(2+) dichloride, converted based on molecular weight. This results in an EC50 of 0.061 mg tetraammine palladium(2+) dichloride L-1. Based on this result, an environmental classification of Acute Category 1, Chronic Category 1 is assigned to this substance, with an acute M factor of 10 and a chronic M factor of 10.