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EC number: 264-885-7
CAS number: 64417-98-7
The available information on bioaccumulation of zirconium in the aquatic
and terrestrial food chain was studied in algae and higher terrestrial
plants, respectively, yielding the following conclusions:
- Although no data are available on other aquatic organisms besides
algae and cyanobacteria, it can be concluded that zirconium has no
potential to bioconcentrate/bioaccumulate in the aquatic food chain. A
rapid uptake of zirconium from the medium was observed as well as a
rapid desorption. The BCF values obtained for cyanobacteria and
microalgae were very low, the highest value being 0.064 L/kg ww.
- Based on a study on the transfer of zirconium from soil to plants, it
could further be concluded that there is no potential for
bioaccumulation of zirconium in the terrestrial food chain, as all BSAF
values were well below 1.
The available information on bioaccumulation of yttrium in the aquatic
and terrestrial food chain yielded the following conclusions:
- BCF/BAF values for aquatic plants, aquatic invertebrates and fish were
992.7, 27.36 to 1482.6 and 1.3 to 54 L/kg ww, respectively. As for other
rare earth elements, bioaccumulation seems to become less substantial
when ascending the food chain, indicating no potential for
biomagnification (as confirmed by data from a microcosm study). A key
BAF value of 4.65 L/kg ww was calculated for fish. Based on the
available data, the potential of yttrium for
bioconcentration/bioaccumulation is concluded to be very low.
- Based on information from review publications on rare earth elements
in terrestrial plants, it can be concluded that there is no potential
for bioaccumulation of yttrium in the terrestrial food chain, as all
reported BSAF values were well below 1.
Because based on the low water solubility of yttrium zirconium oxide,
the release of yttrium and zirconium in the environment, and hence their
bioavailability, is expected to be very limited, it can be concluded -
taking into account the available data on bioaccumulation in aquatic and
terrestrial organisms - that no bioaccumulation of yttrium or zirconium
from yttrium zirconium oxide is to be expected in the terrestrial
environment and only limited bioaccumulation may occur in the aquatic
environment, levelling out when ascending the food chain.
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