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EC number: 281-897-8
CAS number: 84057-80-7
the read-across strategy, it is considered appropriate to cover this
endpoint by a key study performed with zirconium dichloride oxide. This
study (Garnham et al., 1993) was assigned a Klimisch score of 2
(reliable with restrictions). Bioconcentration factors were measured in
cyanobacteria and microalgae and observed to be low. A key BCF value of
0.064 L/kg ww was selected as a worst case key value.
The accumulation of zirconium by
cyanobacteria and microalgae was characterized by Garnham et al. (1993).
In this study the organisms were exposed to solutions of zirconium
dichloride oxide. Actual exposure however was rather to zirconium
dioxide, since zirconium dichloride oxide hydrolyses rapidly in aqueous
solutions at environmentally relevant pH, resulting in the precipitation
of zirconium as zirconium dioxide or hydroxide. In all cyanobacterial
and microalgal species examined, accumulation consisted of a single
rapid energy-independent phase ("biosorption"). No energy-dependent
accumulation was observed. Biosorption of zirconium was
concentration-dependent, followed a Freundlich adsorption isotherm, and
was dependent on pH, showing decreasing accumulation with decreasing pH.
Zirconium desorption from micro-algae and cyanobacteria was increased by
increasing external cation concentrations or by decreasing the pH of the
desorption agent. Overall, biosorption/bioaccumulation was very limited.
BCF values between 0.0525 and 0.64 L/kg dw were obtained. Assuming 90%
water content in the organisms, the highest value can be recalculated to
a BCF of 0.064 L/kg ww. This highest value can be considered as key
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