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EC number: 231-176-9
CAS number: 7440-67-7
Key study was performed with ZrO2 on Danio rerio during 96 hours according to OECD guideline 203. Results displayed a LL50 and a NOELR > 100 mg/L of ZrO2. In terms of zirconium element, this correspond to a NOELR (96h) > 74 mg Zr/L.
Three studies have been identified for short-term toxicity to fish based
on read-across from zirconium compounds. The key study selected is a
study performed with zirconium dioxide (ZrO2). ZrO2 is a suitable
substance to study the effect of Zr in water as Zr undergoes
complexation to form hydrated forms of ZrO2, as indicated in the
environmental fate section.
The 96 hours exposure of Danio rerio to ZrO2 displayed a LL50 and
a NOELR of > 100 mgZrO2/L which corresponds in terms of Zr element a
concentration of > 74.03 mg/L.
The second study identified for fish toxicity, was performed with
zirconium tetrachloride. In water, ZrCl4 decomposes rapidly into HCl and
ZrOCl2 which then precipitates into ZrO2 under environmental conditions.
The authors did not neutralized water solution and therefore a
pH-induced effect was observed at high concentration. However, the
pH-induced effect was inexistent at 20 mgZr/L (pH = 6.0). Therefore LC50
for this study was at least > 20 mg Zr/L.
Unfortunately, the third study performed with zirconium dichloride oxide
(ZrOCl2) on Heteropneustes fossilis and Clarius sp. was
disregarded because very few information was available for the fish
toxicity test. Nevertheless, no effect was observed at a loading rate of
100 mg ZrOCl2/L (i.e 51 mg Zr/L).
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