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Diss Factsheets
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EC number: 234-842-7 | CAS number: 12036-22-5
- 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
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Water solubility
Administrative data
Link to relevant study record(s)
- Endpoint:
- water solubility
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- November 2011 to February 2012
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- other:
- Remarks:
- Valid without restriction; comparable to guideline study
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- other: OECD Guideline for testing of chemicals - draft proposal - February 2001. Transformation dissolution of metals and metal compounds in aqueous media
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- other: The Standard Operating Procedure for the Transformation/Dissolution of Metals and Sparingly Soluble Metal Compounds, Version February 2004; proposed by CANMET and LISEC
- 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: Transformation/Dissolution Test
- Water solubility:
- 76 µg/L
- Temp.:
- 19.6 °C
- pH:
- 6.1
- Remarks on result:
- other: total dissolved W, pH screening test, time point 0 h, 100 mg/L loading
- Water solubility:
- 567 µg/L
- Temp.:
- 21.5 °C
- pH:
- 6.07
- Remarks on result:
- other: total dissolved W, pH screening test, time point 24 h, 100 mg/L loading
- Water solubility:
- 72 µg/L
- Temp.:
- 21.4 °C
- pH:
- 7.03
- Remarks on result:
- other: total dissolved W, pH screening test, time point 0 h, 100 mg/L loading
- Water solubility:
- 635 µg/L
- Temp.:
- 21.5 °C
- pH:
- 7.01
- Remarks on result:
- other: total dissolved W, pH screening test, time point 24 h, 100 mg/L loading
- Water solubility:
- 57 µg/L
- Temp.:
- 20.1 °C
- pH:
- 7.83
- Remarks on result:
- other: total dissolved W, pH screening test, time point 0 h, 100 mg/L loading
- Water solubility:
- 780 µg/L
- Temp.:
- 20.9 °C
- pH:
- 7.87
- Remarks on result:
- other: total dissolved W, pH screening test, time point 24 h, 100 mg/L loading
- Water solubility:
- 33 µg/L
- Temp.:
- 22.6 °C
- pH:
- 7.98
- Remarks on result:
- other: total dissolved W, 7 day full T/D-test, 1 mg/L loading
- Water solubility:
- 239 µg/L
- Temp.:
- 22.8 °C
- pH:
- 7.8
- Remarks on result:
- other: total dissolved W, 7 day full T/D-test, 10 mg/L loading
- Water solubility:
- 4 225 µg/L
- Temp.:
- 23.5 °C
- pH:
- 7.8
- Remarks on result:
- other: total dissolved W, 7 day full T/D-test, 100 mg/L loading
- Water solubility:
- 106 µg/L
- Temp.:
- 22.6 °C
- pH:
- 7.8
- Remarks on result:
- other: total dissolved W, 28 day full T/D-test, 1 mg/L loading
- Details on results:
- Transformation / dissolution screening test of tungsten dioxide, showed a maximum tungsten release of 780 μg/L at pH 8, after 24 hours of incubation in OECD medium. A full transformation / dissolution study was performed at pH 8 with sample loadings of 1, 10 and 100 mg/L. A direct relationship between sample loading and metal released to the media, after seven days of T/D, with values of 33, 239 and 4225 μg/L for 1, 10 and 100 mg/L loading, respectively, could be observed.
The W-concentrations measured in the controls (blanks) were below detection limit. - Conclusions:
- Interpretation of results (migrated information): slightly soluble (0.1-100 mg/L)
The test substance was found to be most soluble at a pH of 8. The respective W-concentrations of about 4.2 mg/L for the 7 day, 100 mg/L loadings at pH 8 indicate that the substance is slightly soluble. - Executive summary:
A transformation / dissolution (T/D) test equivalent to "OECD Guideline for testing of chemicals: Transformation dissolution of metals and metal compounds in aqueous media (2001)" was carried out to study the potential of tungsten dioxide to release metal to the environment. A 24 hour screening test to determine the pH of maximum tungsten release was performed at pHs of 6, 7 and 8 with a sample loading of 100 mg/L. An increasing release of metal as the pH goes from 6 to 8 was measured, 567 and 780 μg/L, respectively. Accordingly pH 8 was chosen to perform the full T/D test. The acute endpoint (7 days), was performed at a sample loading of 1, 10 and 100 mg/L; chronic endpoint was determined from the extension of the 1 mg/L loading test to 28 days. The results of the study indicate a direct relationship between sample loading and metal released to the media, after seven days of T/D, with values of 33, 239 and 4225 μg/L for 1, 10 and 100 mg/L loading, respectively. After 28 days a release of 106 µg/ml was measured with a sample loading of 1 mg/L.
Reference
Description of key information
A transformation/dissolution test equivalent to the OECD guideline for testing of chemicals on transformation dissolution of metals and metal compounds in aqueous media is available showing that tungsten dioxide is slightly soluble in water.
Key value for chemical safety assessment
- Water solubility:
- 4.2 mg/L
- at the temperature of:
- 23.5 °C
Additional information
Tungsten dioxide was found to be most soluble at a pH of 8. The respective tungsten concentrations of about 4.2 mg/L for the 7 day, 100 mg/L loadings at pH 8 indicate that the substance is slightly soluble (0.1–100 mg/L).
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.
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