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