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EC number: 825-760-8 | CAS number: 39290-95-4
The study of Ablitt (2018), investigating the acute toxicity of tungsten zirconium hydroxide oxide in Daphnia magna according to OECD guideline 202, was considered as the key study for endpoint coverage. In this semi-static test, no immobilisation was observed after 48 hours of exposure to 1.0, 10% and 100% v/v dilutions of a saturated solution with a nominal loading rate of 100 mg/L. Dissolved zirconium concentration were < LOQ (i.e. 0.002 mg Zr/L) in all test media at all sampling times, whereas dissolved tungsten concentrations were in the range of 0.0029-0.46 mg/L. Based on the results of this study it can be concluded that tungsten zirconium (hydroxide) oxide is not harmful to aquatic invertebrates.
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