Registration Dossier
Registration Dossier
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EC number: 272-702-7 | CAS number: 68909-34-2
Endpoint summary
Administrative data
Description of key information
Additional information
Bioaccumulation: aquatic/sediment:
Due to its extremely low water solubility, the substance will not reach high concentrations in the water, so bioaccumulation in aquatic organisms can be regarded as negligible. Furthermore, due to complexation with (an)organic molecules in water, ZrO2 will become not-bioavailable both for aquatic and sediment-dwelling organisms. Therefore, it is not feasible to perform a bioaccumulation test in water / sediment.
Bioaccumulation: terrestrial:
Ferrand (2006) determined biota to soil accumulation factors for plants. In the study, transfer of Zr from soil to tomato and pea plants was studied during a 7-day exposure period in two soils (an acidic and a calcareous soil) amended with either a soluble (ZrOCl2 or Zr acetate) or an insoluble Zr compound (Zr(OH)4). Zr accumulated mainly in the roots, with Zr adsorption to the root surface being of minor relevance. Translocation to aerial parts was limited. BSAF values for roots were the highest for Zr acetate and the lowest for Zr(OH)4. They were all <= 0.1. BSAF values for aerial parts were all <= 0.005 and were also generally the highest for Zr acetate and the lowest for Zr(OH)4.
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