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EC number: 237-529-3
CAS number: 13826-66-9
Based on the key study of Ferrand et al. (2006) (Klimisch 2), it can be
concluded that there is no concern for bioaccumulation of zirconium in
terrestrial organisms, as all BSAF values (obtained for roots and aerial
parts of plants) were well below 1. This study was performed with
zirconium acetate, zirconium dichloride oxide, and zirconium
tetrahydroxide. Following the read across strategy, these data can be
considered relevant for zirconium dinitrate oxide too. The read across
justification is attached to IUCLID Section 13.
In the study of Ferrand et al. (2006), transfer of zirconium 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 (zirconium dichloride oxide or zirconium acetate) or an
insoluble zirconium compound (Zr(OH)4). Zirconium accumulated mainly in
the roots, with zirconium adsorption to the root surface being of minor
relevance. Translocation to aerial parts was limited. BSAF values for
roots were the highest for zirconium 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 zirconium acetate and the
lowest for Zr(OH)4. These values are however all below 1, indicating
that zirconium has a very limited potential for bioaccumulation in
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