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Toxicity to aquatic algae and cyanobacteria

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Data on the acute toxicity of trimagnesium bis(orthophosphate) (CAS 7757-87-1) to aquatic algae are not available. The assessment was therefore based on studies conducted with the analogue substance tricalcium bis(orthophosphate) (CAS 7758-87-4) as part of a read across approach, which is in accordance with Regulation (EC) No. 1907/2006, Annex XI, 1.5.

The acute toxicity of tricalcium bis(orthophosphate) to aquatic algae was investigated in a study following OECD guideline 201 (Kim et al. 2013). Pseudokirchnerella subcapitata was exposed to nominal test substance concentrations of 0.3, 1, 3.1, 9.8, 31.3, and100 mg/L. The mean measured test concentrations after 72 hours was 0.61-1.56 mg/L. Based on the algal growth rate an EC50(72 h) >1.56 mg/L (measured) was determined (nominal: EC50(72 h) >100 mg/L).

Based on the study results for the read across substance tricalcium bis(orthophosphate) the assessed substance trimagnesium bis(orthophosphate) is considered not acutely toxic to aquatic algae.