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Toxicity to aquatic algae and cyanobacteria

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Aquatic toxicity studies with calcium dibenzoate are not available, thus aquatic toxicity will be addressed with existing data on the dissociation products.

 

Calcium: Calcium as an essential element has a very low potential for toxicity to freshwater and saltwater algae and adverse effects are lacking up to and including the respective OECD/EC guidelines limit concentrations.

 

Benzoic acid: Reliable aquatic toxicity data of benzoic acid are available from guideline studies for algae. The lowest EC10 and EC50 values amount to 3.3 mg/L and 33.1 mg/L, respectively. In sum, benzoic acid has a low potential for toxicity to algae.

 

Calcium dibenzoate: Using existing aquatic toxicity data of the dissociation products of calcium dibenzoate, the aquatic hazard assessment is based on the most toxic moiety, i.e. the benzoate anion. Existing aquatic toxicity data of benzoic acid are recalculated for calcium dibenzoate based on a maximum benzoate content of 85.8 %. Reliable aquatic toxicity data are available from guideline studies for algae; the lowest EC10 and EC50 values amount to 3.9 mg/L and 38.3 mg/L, respectively. In sum, calcium dibenzoate has a low potential for toxicity to algae.

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