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Diss Factsheets
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EC number: 231-975-2 | CAS number: 7783-03-1
- 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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Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
- Endpoint:
- particle size distribution (granulometry)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Study period:
- N/A to 2009-05-08
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study with acceptable restrictions
- Qualifier:
- according to guideline
- Guideline:
- ISO 13320 (Particle size analysis - Laser diffraction methods)
- Version / remarks:
- 2009
- Principles of method if other than guideline:
- The particle size was analyzed by the Malvern MasterSizer LASER diffracter. This instrument is an ensemble analyzer that calculates a volume distribution from the LASER diffraction pattern of a cloud of particles. This raw scatter data is then processed using a complex algorithm and presented on the basis of an equivalent spherical diameter. This instrumentation is approved by ECHA Guidance, 2008 (Chapter R.7a, pg. 148)
- GLP compliance:
- not specified
- Type of method:
- Laser scattering/diffraction
- Type of particle tested:
- primary particle
- Type of distribution:
- volumetric distribution
- Specific details on test material used for the study:
- Identification: tungstic acid
Chemical formula: H2WO4
CAS No.: 7783-03-1
Sponsor: H.C. Starck Tungsten GmbH
Batch No.: TA17NF0054 - Key result
- Percentile:
- D10
- Mean:
- 1.3 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: volume
- Key result
- Percentile:
- D50
- Mean:
- 7.93 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: volume
- Key result
- Percentile:
- D90
- Mean:
- 13.2 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: volume
- Key result
- Percentile:
- D10
- Mean:
- 0.11 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: number
- Key result
- Percentile:
- D50
- Mean:
- 0.19 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: number
- Key result
- Percentile:
- D90
- Mean:
- 0.53 µm
- St. dev.:
- 0
- Remarks on result:
- other: Distribution type: number
- Conclusions:
- This tungstic acid registraion covers a highly pure (>99.9%) monoconstituent substance with a particle size distribution on the microsized region.
Reference
No specific standard deviation were identified for the particle distribution data although significant robust data was presented in the laboratory report.
The B.E.T. Surface Area of the test substance sample was determined to be 15.21 m^2/g.
Description of key information
Mean (based on volume) D10, D50, and D90 = 1.30, 7.93 and 13.20 um, respectively.
The specific surface area of the test substance sample (as determined by B.E.T.) was found to be 15.21 m2/g.
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.
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