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Diss Factsheets
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EC number: 234-733-4 | CAS number: 12028-48-7
- 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
Water solubility
Administrative data
Link to relevant study record(s)
- Endpoint:
- transformation / dissolution of metals and inorganic metal compounds
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Remarks:
- Well documented, scientifically sound study that determined the dissolution of the test substance according to the UN Guidance on transformation/dissolution (T/D) of metals and metal compounds (UN GHS Annex 10).
- Qualifier:
- according to guideline
- Guideline:
- other: UN Guidance on transformation/dissolution (T/D) of metals and metal compounds (UN GHS Annex 10)
- Principles of method if other than guideline:
- Standardized amounts of powdered solids are added to specified simulated aquatic media and amounts of the relevant soluble metal ion are measured after defined timepoints.
- GLP compliance:
- no
- Type of method:
- other: Guidance on transformation/dissolution (T/D) of metals and metal compounds (UN GHS Annex 10)
- Key result
- Type of test:
- screening transformation/dissolution test - sparingly soluble metal compounds
- Mean dissolved conc.:
- 65.47 mg/L
- Element analysed:
- Dissolved tungsten
- Loading of aqueous phase:
- 100 mg/L
- Incubation duration:
- 24 h
- Test conditions:
- pH=8.5; 21°C
- Key result
- Type of test:
- screening transformation/dissolution test - sparingly soluble metal compounds
- Mean dissolved conc.:
- 87.88 mg/L
- Element analysed:
- Tungstate anion (WO4=)
- Loading of aqueous phase:
- 100 mg/L
- Incubation duration:
- 24 h
- Test conditions:
- pH=8.5; 21°C
- Details on results:
- AMT was readily soluble, dissolving within a few minutes of contact with the pH 8.5 medium.
The W and WO4(2-) concentrations at 24 h for AMT were 65,467 ug/L (σ% = 2) and 87,880 ug/L (σ% = 7), respectively, which, at 91% dissolution, suggest that 100% AMT dissolution was essentially achieved. Moreover the y-value is 0.745, which indicates that most of the W dissolved as WO4(2-) . - Conclusions:
- Ammonium metatungstate was readily soluble, dissolving within a few minutes of contact with the pH 8.5 medium. The W and WO4(2-) concentrations at 24 h for AMT were 65,467 ug/L (σ% = 2) and 87,880 ug/L (σ% = 7), respectively, which, at 91% dissolution, suggest that 100% AMT dissolution was essentially achieved. Moreover the y-value is 0.745, which indicates that most of the W dissolved as WO4(2-) .
Reference
The average temperature varied in the range 19.8 -22.0 °C, with 19.8 °C as the single value below 20.0 ° C, which was not expected to affect the reaction kinetics. With the maximum temperature of 22.0 °C, essentially all temperatures fell within the 20-23 °C proposed in the T/D guidance document. The average D.O. readings met or exceeded the >70% saturation criterion.
All target 8.5 pH levels in the W-series for the test substance lay in the range 8.3-8.7, which is the variability proposed from the T/D guidance.
Description of key information
Information on the water solubility of ammonium metatungstate is available from a Transformation/Dissolution (T/D) test, in which ammonium metatungstate yielded a release of 65.47 mg dissolved tungsten/L at 100 mg AMT/L loading and a pH of 8.5.
Key value for chemical safety assessment
- Water solubility:
- 65.47 mg/L
- at the temperature of:
- 21 °C
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.
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