Registration Dossier
Registration Dossier
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EC number: 231-174-8 | CAS number: 7440-65-5
Endpoint summary
Administrative data
Description of key information
Additional information
Short-term toxicity to fish:
An acute toxicity study on rainbow trout (Ablitt, 2018) demonstrated that yttrium metal did not cause any adverse effects in fish exposed to a saturated solution with a nominal loading rate of 100 mg/L (0.61 mg total dissolved Y/L (equivalent to 100% v/v saturated solution). Based on the results of this study, yttrium metal should not be considered as harmful to fish.
Short-term toxicity to aquatic invertebrates:
As no data are available on yttrium metal, an analogy was made with the related substance yttrium oxide. Yttrium metal and yttrium oxide are both poorly water soluble substances, the results of the study performed with yttrium oxide is considered to be reliable for endpoint coverage.The read across study was assigned key status for endpoint coverage.
The study performed with this read across substance (Ablitt, 2017) did not observe any adverse effects in daphnids up to and including at the highest concentration tested, i.e. a 100% v/v saturated solution with nominal loading rate of 100 mg/L (equivalent to 0.465 mg Y/L and expressed as 0.523 mg/L yttrium oxide). Therefore, yttrium oxide is not harmful to aquatic invertebrates up to its solubility limit into water. Consequently, by analogy with yttrium oxide, yttium metal is considered not to be harmful to aquatic invertebrates.
Toxicity to aquatic algae and cyanobacteria:
For algae, all available data for both water soluble, sparingly soluble, and insoluble rare earth compounds have been summarised and thoroughly evaluated in the document attached to IUCLID Section 13. In this expert statement, it is concluded that there is no scientific added value in the performance of further algal growth inhibition studies with rare earth compounds. For insoluble and sparingly soluble rare earth compounds, EC50 values (loading rate-based) were consistently > 100 mg/L (or > 100% v/v of a saturated solution with nominal loading rate 100 mg/L). Based on this information, yttrium metal can be concluded not to be harmful to algae either.
Toxicity to aquatic microorganisms:
Finally, based on water solubility and exposure considerations, it is considered very unlikely that yttrium metal would be hazardous to aquatic microorganisms and/or pose risks for adverse effects to occur in microorganisms in biological sewage treatment plants. Therefore, it was considered not necessary to perform an activated sludge respiration inhibition test with yttrium metal.
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