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EC number: 945-888-9
CAS number: -
batch equilibrium studies, the adsorption of Yb(III) on silica and
aluminium was shown to strongly depend on pH. While adsorption at acidic
pH values in negligible, Kd values at the pH range of ca. 6.6 to 8 range
between 2,300 and 12,000, see section 5.4.1. As batch equilibrium
studies were conducted (not only screening studies), no further
information regarding adsorption/desorption was deemed as necessary.
Due to the low water solubility of the
metal components contained in the test substance (zirconium
oxide, hafnium and ytterbium doped),
a full transformation/dissolution protocol was carried out to study the
potential release of these metals to the environment.
After 7 and 28 days (nominal loading
of 100 mg/L, pH 8), only ytterbium(III) was found in solution with a
maximum concentration of 0.069 µg/L. Zirconium and hafnium were both
below the detection limit of 0.07 and 0.02 µg/L, respectively.
Therefore, information on ytterbium(III) is relevant for the assessment
of environmental fate properties ofzirconium
oxide, hafnium and ytterbium dopedand
adsorption studies with ytterbium are used in a read-across approach.
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