Registration Dossier
Registration Dossier
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EC number: 215-238-2 | CAS number: 1314-61-0
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:
- PNEC STP
- PNEC value:
- 200 mg/L
- Assessment factor:
- 10
- Extrapolation method:
- assessment factor
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 for bioaccumulation
Additional information
Conclusion on classification
The water solubility of ditantalum pentaoxide determined according to OECD Guideline 105 is < 5 µg/L at 10 °C and 20 °C (Wenighöfer & Fröschl, 2012). In addition, it is demonstrated by the results of the T/D Test according to OECD 29 that the substance is virtually insoluble. The highest dissolved Ta concentration in the test medium was 0.16 µg/L (loading 100 mg/L after 7 days, samples 0.2 µm filtered and centrifugally ultra-filtered (3 kDa filtration)).
The available key studies addressing three different aquatic species (daphnia, algae and fish) were conducted with nominal test substance concentrations of 1 mg/L. Actual (dissolved) test substance concentrations were not analytically verified. However, due to the reported procedures for the preparation of test solutions, the test substance is considered to have been tested at its maximum solubility in the respective test media. The following results based on the nominal test substance concentration were obtained:
- Short term toxicity to fish (Brachydanio rerio): 96 hour LC0 ≥ 1 mg/L (limit of solubility) (Caspers, 2001).
- Short-term toxicity testing to invertebrates (Daphnia magna): 48 hour EC0 ≥ 1 mg/L (limit of solubility). (Müller, 2001)
- Growth inhibition study on aquatic plants (Desmodesmus subspicatus): no toxic effects were observed at 1 mg/L (limit of solubility). (Casper, 2000)
The assessment of ready biodegradability is not applicable to inorganic substances.
Based on the high insolubility of the substance in water and its high molecular weight, it is not expected to bioaccumulate.
With respect to the information available for this substance (presented above), the substance is not classified as hazardous to the aquatic environment (short or long-term) in accordance with Regulation (EC) 1272/2008.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
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