Registration Dossier
Registration Dossier
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EC number: 271-591-2 | CAS number: 68585-82-0
Adsorption / desorption
Administrative data
Link to relevant study record(s)
Description of key information
Yttrium oxide, europium doped is an inorganic substance with no to very limited solubility in aqueous solutions and therefore this substance is not expected to adsorb to soil/sediment. In this case, a Koc value of 10 can be used according to a RIVM report (https://www.rivm.nl/bibliotheek/rapporten/601516013.pdf).
Key value for chemical safety assessment
- Koc at 20 °C:
- 10
Additional information
No OECD guideline study is present as it is scientifically not possible to perform the test. This substance is an inorganic substance with no to very limited solubility in solvents commonly used for chromatography (i.e. water, aqueous buffers, organic solvents).
Depending on the prevailing environmental conditions, formation of different yttrium species may theoretically occur when yttrium oxide, europium doped enters the aquatic compartment, although until today such assumption has not been confirmed by experiment due to technical issues in view of the insolubility of the substance.
On the other hand, it is known that yttrium salts, which can possess much higher solubility in water as compared to yttrium oxide, europium doped, have affinity to adsorb to soils/sediments. In this context, three publications describe the testing of the adsorption capacity of Y radionuclids (under carbonate and chloride form) in different kinds of soil. Kd values for yttrium were assessed to be between 46000 mL/g and 61300 mL/g for soils and around 9390 mL/g for soils from which organic matter and calcium carbonate were intentionally removed. The publication of Tao (2000) showed the adsorption capacity of lanthanids in different soils and proved that this capacity is very similar for the whole category of lanthanids and is a function of chemical interaction (especially including chemical bound energy).
Although the results for yttrium salt adsorption are rather clear, these findings can only be an indication of the adsorption behavior of the dissolved fraction of yttrium oxide, europium doped, which is expected to be extremely low.
In conclusion, yttrium oxide, europium doped is not expected to behave in a similar way as yttrium chloride or yttrium carbonate due to its insolubility in water in combination with the unlikeliness of exposure to the aquatic compartment.
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