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EC number: 231-176-9
CAS number: 7440-67-7
The Kd values resulting from validated studies range from 3700L/kg (dw) for organic soil to 30000 L/kg (dw) for the calcareous soil. These values indicate high variability depending on the soil type. Key information for the adsorption/desorption are 6000 L/kg (dw) for acidic soil and 30000 L/kg (dw) for calcareous soil, which correspond to Koc values of respectively 18868 and 89286. A geometric mean value of Koc=41044 will be considered for PNECsed derivation. In conclusion, these studies demonstrate a strong affinity of zirconium for the solid phase of the soil particle.
The study of E .Ferrand used the batch equilibrium method by loading 2
different soils: acidic sandy clayey loamy pH 5.5 (soil A) and clayey
calcareous soil pH 8.3 (soil B) with zirconium dichloride oxide
(ZrOCl2). Kd values for these soil types were respectively 6000 L/kg
(dw) for soil A and 30000 L/kg (dw) for soil B, corresponding to Koc
values of 18868 and 89286 respectively. These values demonstrate a
strong affinity of zirconium for the solid phase of the soil particle.
In parallel to experimental result of E. Ferrand (2005), Kd values
reported in the last version of IAEA (Handbook data) are between 3700
and 5000 L/Kg. Differences reported are related to the soil type used.
While these data have been already reviewed by expert no more
information were available in order to go further in the behaviour of
zirconium in the environment.
Therefore, only values of E. Ferrand were identified as key information.
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