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Short-term toxicity to aquatic invertebrates

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Aquatic toxicity data of zirconium, acetate lactate oxo ammonium complexes are not available. Zirconium, acetate lactate oxo ammonium complexes consists of ammonium [NH4]+ and zirconium [Zr]4+ cations and acetate [CH3COO]2- and lactate [CH3CH(OH)COO]2- anions. A complete dissociation of zirconium, acetate lactate oxo ammonium complexes resulting in ammonium, zirconium, acetate and lactate ions may be assumed under environmental conditions. Since acetate, ammonium, lactate and zirconium ions upon release behave differently in the environment, the fate and toxicity of acetate, ammonium, lactate and zirconium ions in the environment is most accurately assessed separately.

A reliable guideline study with D. magna and acetic acid indicated that decreasing pH conditions are the driver of observed effects with 24h-EC50 values of 6000 (adapted pH) and 95 mg/L (non- adapted pH, respectively. Lactate with a 48h-EC50 of 240 mg/L for D. magna also seems to be of low toxicity. QSAR based 48h-EC50 values for acetate and lactate are further well above the OECD test limit of 100 mg/L.

Ammonium in the form of ammonium chloride appears to have a low acute toxicity to D. magna with a 48-LC50 of 101 mg/L, i.e. slightly above the OECD test limit of 100 mg/L.

Zirconium is poorly soluble and precipitates under most environmental conditions whereas neodecanoate is rather mobile. The potential for acute toxicity of zirconium in the form of zirconium dioxide to aquatic invertebrates is thus low based on the 48h-EC50 above the OECD 202 test limit of 100 mg/L for Daphnia magna.

In sum, a hazard was not identified for any of the dissociation products of zirconium, acetate lactate oxo ammonium complexes and thus a low potential for acute toxicity to aquatic invertebrates is assumed.

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