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EC number: 231-176-9 | CAS number: 7440-67-7
- 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

Endpoint summary
Administrative data
Description of key information
Additional information
Stability of Zirconium in water:
In contact with moisture/water, Zirconium metal is directly oxidised and a relatively stable passivation layer of ZrO2 is formed at the surface. As ZrO2 is very poorly soluble (< 0.055 mg/L), the behaviour of Zr in water is driven by the solubilisation and complexation of ZrO2. The chemical behaviour of hydrated forms of zirconium dioxide (ZrO2.x H2O, Zr(OH)4), is highly dependent on the water chemistry and the hydroxide species presents in solution that could lead to complex formation such as [Zr(OH)x](4-x)-. Some organic ligands (i.e. oxalates, citrate and organic matter) or inorganic (i.e. fluorine, phosphate or carbonate) can form complexes enough strong to increase the solubility or reduce the precipitation of zirconium. These ligands would thus allow, to have a highest concentrations of Zr in solution and being able to reach 10-6 / 10 -4M. The value of 10-6 M was confirmed by the water solubility test (<0.05 mg Zr/L).
Furthermore, Zirconium compounds would not volatilize from aqueous solution due to their ionic character.
Biodegradation:
Zirconium is inorganic and can therefore not undergo any microbial degradation.
Bioaccumulation:
Due to its very low water solubility (<0.05 mg/L) and the particular properties of zirconium to sorb on particles, the substance will not reach high concentrations in water, so bioaccumulation in aquatic organisms is unlikely to occur.
Adsorption/Desorption:
Considering the high Kd values, zirconium displays a strong affinity for the solid phase of the soil particle.
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