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EC number: 234-364-9 | CAS number: 11120-25-5
- 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:
- other: 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.:
- 67.21 mg/L
- Element analysed:
- Total 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.:
- 92.972 mg/L
- Element analysed:
- Tungstate anion (WO4-2)
- Loading of aqueous phase:
- 100 mg/L
- Incubation duration:
- 24 h
- Test conditions:
- pH=8.5; 21°C
- Details on results:
- Ammonium wolframate was readily soluble, dissolving within a few minutes of contact with the pH 8.5 medium.
The W and WO4-- concentrations at 24 hr for the ammonium wolframate were 67,210 ug/L (σ% = 2) and 92,972 ug/L (σ% = 13), respectively, which, at 95% and 98% dissolution, suggest essentially 100% ammonium wolframate dissolution. Moreover, y is 0.723, which indicates that most of the W dissolved as WO4-- . - Conclusions:
- Ammonium paratungstate was readily soluble, dissolving within a few minutes of contact with the pH 8.5 medium.
The W and WO4-2- concentrations at 24 hr for the APT were 67,210 ug/L (σ% = 2) and 92,972 ug/L (σ% = 13), respectively, which, at 95% and 98% dissolution, suggest essentially 100% ammonium paratungstate dissolution. Moreover, y is 0.723, which indicates that most of the W dissolved as WO4-2- . - Endpoint:
- water solubility
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- data from handbook or collection of data
- Remarks:
- Data from peer-reviewed handbook or collection of data
- Reason / purpose for cross-reference:
- reference to same study
- Principles of method if other than guideline:
- Data in this peer-reviewed publication were taken from many sources, including both compilations and primary literature. Where conflicts were found, the value deemed most reliable was chosen for inclusion in the handbook. Reference sources were not provided for this parameter, nor was the experimental method.
- GLP compliance:
- no
- Key result
- Water solubility:
- 20 g/L
- Conc. based on:
- other: g WO3/L
- Temp.:
- 20 °C
- pH:
- ca. 7
- Remarks on result:
- completely miscible
- Key result
- Water solubility:
- 60 g/L
- Conc. based on:
- other: g WO3/L
- Temp.:
- 90 °C
- pH:
- ca. 7
- Remarks on result:
- completely miscible
- Details on results:
- Assumed to be tested at neutral pH as no pH data were reported.
- Conclusions:
- Ammonium paratungstate water solubility has been reported as 20 g WO3 equivalents/L at 20 °C.
Referenceopen allclose all
The average temperature varied in the range 21.0-21.6 °C, with 19.9 °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
Ammonium paratungstate (APT) water solubility has been reported as 20 g WO3 equivalents/L at 20 °C. However solubility is also assessed through Transformation/Dissolution testing, which yielded a release of 67.21 mg dissolved tungsten/L at 100 mg APT/L loading and a pH of 8.5.
Key value for chemical safety assessment
- Water solubility:
- 67.21 mg/L
- at the temperature of:
- 21 °C
Additional information
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