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Toxicity to microorganisms

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Aquatic toxicity data of zirconium, acetate lactate oxo ammonium complexes are not availabll. 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.

Data on respiration inhibition are not available for acetate, lactate and ammonium. However, lactate and acetate are applied as carbonaceous source and ammonium as nitrogen source to sewage sludge microorganisms. Acetate, ammonium and lactae are rapidly degraded and not expected to accumulate in STPs. Thus, acetate, ammonium and lactate have a low potential for toxicity to microorganisms. Zirconium is poorly soluble under most environmental conditions so that microorganisms in the STP will not be exposed to zirconium.

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 the toxicity to aquatic microorganisms is assumed.

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