Registration Dossier
Registration Dossier
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EC number: 231-127-1 | CAS number: 7440-18-8
Ecotoxicological Summary
Administrative data
Hazard for aquatic organisms
Freshwater
- Hazard assessment conclusion:
- no hazard identified
Marine water
- Hazard assessment conclusion:
- no hazard identified
STP
- Hazard assessment conclusion:
- no hazard identified
Sediment (freshwater)
- Hazard assessment conclusion:
- no hazard identified
Sediment (marine water)
- Hazard assessment conclusion:
- no hazard identified
Hazard for air
Air
- Hazard assessment conclusion:
- no hazard identified
Hazard for terrestrial organisms
Soil
- Hazard assessment conclusion:
- no hazard identified
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
Direct ecotoxicity testing of poorly soluble metal substances is not appropriate, instead the standard approach for assessing the toxicity of poorly soluble metals is to compare the release of metal ions in transformation / dissolution (TD) tests conducted at different loading rates and for different time periods, with acute and chronic environmental reference values (ERVs) for a soluble form of the metal. This approach is used to classify ruthenium metal, and direct testing of ruthenium itself has not been conducted.
Conclusion on classification
Classification of poorly soluble metal substances is conducted by comparing the results from 7 and 28-day transformation / dissolution (TD) tests against acute and chronic environmental reference values (ERVs). The lowest acute EC50 value for a soluble ruthenium substance is a 72 hour algal EC50 of 115 µg Ru L-1 (growth rate), from a study with tetraammonium decachloro-mu-oxodiruthenate, and this is used as the acute ERV. Chronic data are only available for algae and the lowest algal EC10 (growth rate) is 6 µg Ru L-1, also from a study with tetraammonium decachloro-mu-oxodiruthenate. This is used as the chronic ERV.
The results from the definitive TD test with ruthenium metal showed that over 28 days at a loading rate of 1 mg L-1, there was no change in ruthenium concentration, within analytical limits. For the 10 and 100 mg L-1 loadings after 7 days net concentration changes of 0.00 µg L-1 (<LOQ) and 0.02 µg L-1 were observed, respectively.
Some of these results are <LOQ, therefore in these cases 0.5 x LOQ has also been compared against the ERV in order to assess classification. As the TD test results are not above the acute or chronic ERV, ruthenium is not classified for the environment.
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