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EC number: 231-176-9
CAS number: 7440-67-7
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
Furthermore, Zirconium compounds would not volatilize from aqueous
solution due to their ionic character.
Zirconium is inorganic and can therefore not undergo any microbial
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.
Considering the high Kd values, zirconium displays a strong
affinity for the solid phase of the soil particle.
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