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EC number: 945-888-9
CAS number: -
Criteria of validity
• Immobilisation of the test organisms in
the control (5 %) at the end of the test was ≤ 10 %.
• Dissolved oxygen concentration at the end
of the test in the control and the test item treatment (≥ 7.4 mg/L) at
the end of the test was ≥ 3 mg/L.
The 48-hr acute immobilisation test of the
test item to Daphnia magna was conducted under static conditions.
Daphnids were exposed to a control containing no test substance, and
ytterbium zirconium oxide at a nominal single loading rate of 100 mg/L
for 48 hr. Immobilisation was observed daily. The 48-hour LOELR was >
100 mg/L (nominal test item loading rate).
The 48-hour NOELR was >= 100 mg/L (nominal
test item loading rate).
study is classified as acceptable and satisfies the guideline
requirements for an acute toxicity study with freshwater invertebrates.
Organism Age: 0.25 - 24 h
- 48 hr LOELR: > 100 mg/L (nominal)
- 48 hr NOELR: >= 100 mg/L (nominal)
The 48-hr NOEL of the test item to Daphnia
magna is ≥ 100 mg/L (nominal loading).
Accompanying chemical analysis
revealed that the solubility of elemental zirconium and ytterbium
released from the test item is below the limit of quantification (< 1
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