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Short-term toxicity to fish

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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.

The potential for acute toxicity of acetate to fish is low based on the 96-h LC50 of 78 mg/L (non-adapted pH) and a respective QSAR-based estimate of 25.8 g/L.

Ammonium seems to have a low acute toxicity to fish with 96-h LC50 values ranging from 74.2 to 218 mg/L and the majority of endpoints being above the OECD test limit of 100 mg/L.

For lactate, experimental and QSAR-based 96-h LC50 values are 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 to fish is thus low based on the 96h-LL50 above the OECD 203 test limit of 100 mg/L for Danio rerio.

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

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