Registration Dossier
Registration Dossier
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EC number: 231-124-5 | CAS number: 7440-15-5
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Hazard for air
Hazard for terrestrial organisms
Hazard for predators
Additional information
Conclusion on classification
Environmental classification of poorly soluble metals is determined by comparison of an environmental reference value (ERV) derived from data for a soluble metal salt, with the amount of dissolution determined in a transformation ./ dissolution study,
For rhenium, data are read across from the soluble rhenium salt sodium rhenate. EC50 values for sodium rhenate, for Daphnia and for algae, were all above 100 mg/L, expressed as sodium rhenate. This is equivalent to >68.16 mg/L expressed as rhenium.
A 24 hour transformation / dissolution screening study was conducted for rhenium powder. Average dissolved rhenium concentrations of 338 µg Re/L at pH 6 and 390 µg Re/L at pH were determined, at a loading of 100 mg/L rhenium powder. It was considered unnecessary to conduct a full 28 day T/D test with rhenium powder, as the amount of dissolution observed in the T/D screening study was far below the EC50 value determined for sodium rhenate, of >68.16 mg Re/L
The ERV value determined based on the ecotoxicity results for the soluble rhenium salt sodium rhenate is above the level of dissolution determined from the 24 hour transformation / dissolution screening study. On this basis, rhenium would not be classified for the environment under DSD or CLP regulations.
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