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EC number: 257-098-5 | CAS number: 51274-00-1 This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 77492.
- 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
Iron hydroxide oxide yellow is an inorganic, yellow christaline solid and considered as nanomaterial.
Iron hydroxide oxide yellow has a very low water solubility ~1-2µg/L after 25 days at pH6-7.
No melting point due to modification at 160°C (water is released on heating)
Relative density: 4.26
Additional information
Information on nanoform-specific physico-chemical properties of iron hydroxide oxide yellow:
- Specific area: It is reported that the surface areas of both natural and synthetic goethites range from ca. 8 to 200 m²/g. XRD line broadening techniques indicate that soil goethites have surface areas of from 20 to 200 m²/g. On the other hand, massive (museum) specimens may consist of mm sized crystals with surface areas well below 1 m²/g.
- Zeta Potential: The zeta potential is not a characteristic of the metal oxide or the particle consisting
of iron oxide in itself.
- Porosity: N2 adsorption isotherms for samples with acicular crystals were type II and gave no indication of there being meso- or microporosity. No evidence of porosity was found for 15 synthetic goethites grown from both Fe(II) and Fe(III) solutions (pH 6 -12).
- Surface Chemistry: The surface chemistry of iron oxide and ferrite pigments is determined by the oxygen present on the surface and their hydroxylation. So no feasible surface activity is observed beside the typical adsorption of species.
- Agglomeration/Aggregation: Like most particulate substances iron hydroxide oxide is present in a highly agglomerated and aggregated form only. These are to be separated in the dispersion process.
- Crystalline Phase: FeOOH is used to the vast majority in their α-modification. A small part of γ-FeOOH is also used. While distinguishable by X-ray-diffraction the α- and γ-modification are very similar in physical and chemical characteristics. No difference is to be expected in toxicological and eco-toxicological aspects.
- Photocatalytic Activity: No known photocatalytic activities of iron oxide and ferrite pigments.
- Pour Density: Result given as tamped density: 0.2 - 0.6 g/ml
- Aspect Ratio: Median aspect ratio 2.1 +/- 1.2
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