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Diss Factsheets
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EC number: 215-238-2 | CAS number: 1314-61-0
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
Endpoint summary
Administrative data
Description of key information
The maximum water solubility of Ta2O5 was determined according to the OECD Guideline 105. Test solutions were stirred up to 5 days at 10 °C and 20 °C, loading: 50 mg/L. Solubility measurements were conducted daily. The water solubility of the test substance was determined to be < 5 µg/L for all time points (see Wenighöfer & Fröschl, 2012). Thus, it can be concluded that Ta2O5 is highly insoluble in water.
In addition, the results of the T/D Test according to OECD 29 (Klawonn, 2022) demonstrate 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)). Therefore, aquatic toxicity is unlikely to occur.
This is confirmed by the acute aquatic toxicity studies conducted with fish, daphnia and algae (see Caspers, 2000 & 2001; Müller, 2001). In each test, the test substance was applied at a nominal concentration of 1 mg/L. Test media were prepared by direct addition of Ta2O5 to the dilution water, ultrasonication (1 h), stirring (24 h) and filtration of any undissolved particles.
Due to the procedures for the preparation of the test solutions, it can be assumed that the maximum dissolved Ta2O5 concentration was achieved in the test solutions.
Typically, the dissolved concentration of a test substance in these test media is lower than in OECD 105 tests. Thus, it can be concluded that the saturation concentration in the aquatic toxicity tests was achieved.
No toxic effects could be observed in any of the acute aquatic toxicity tests at saturation. In addition, Ta2O5 does not meet the criteria for classification as dangerous according to Regulation (EC) No 1272/2008 or is assessed to be a PBT or vPvB. The hazard assessment reveals neither a need to classify the substance as dangerous to the environment, nor that it is a PBT or vPvB substance. In accordance with Column 2 of REACH Annex IX, endpoints 9.1.5 & 9.1.6, testing proposals for a long-term aquatic toxicity do not need to be provided.
Additional information
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.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.