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EC number: 231-176-9
CAS number: 7440-67-7
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 the terrestrial
compartment is driven by the solubilisation, complexation and adsorption
of ZrO2. Therefore, as for other Zirconium compounds, the relevant
substances for read-across purpose that enables to characterize the
effect of zirconium towards terrestrial organisms is ZrO2 and any other
Zirconium compounds leading to the formation of ZrO2.
No information is available
from the literature on toxicity of Zr or Zr compounds to terrestrial
Concerning the effect on
plant, the study available displayed no adverse effect on tomato and pea
seedlings (ca. 21 days old) exposed for 7 days to two different soils
contaminated with either a soluble Zr compound (ZrOCl2 or Zr acetate) or
an insoluble Zr compound (Zr(OH)4). In none of the experiments adverse
effects were observed on root or shoot fresh weight of the plants.
Unbound NOEC values were obtained for all experiments. The highest
unbound NOEC was >= 703.4 mg Zr/kg dw for the acidic soil (417.4 mg
Zr/kg background) and the lowest unbound NOEC was >= 450 mg Zr/kg dw for
the calcareous soil (164 mg Zr/kg background), both soils amended with
286 mg Zr/kg Zr(OH)4.
Concerning the toxicity to
birds, no likely exposure is expected and this endpoint has been waived.
In conclusion, considering
all this information and the exposure assessment presented in the CSR
that reveals very little likelihood of exposure of the terrestrial
compartment (little deposition and no sludge application to agricultural
land) no testing proposal is made for terrestrial toxicity of Zr.
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