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Short-term toxicity to fish

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Data on the acute toxicity of trimagnesium bis(orthophosphate) (CAS 7757-87-1) to fish are not available. The assessment was therefore based on a study 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 fish was investigated in a study following OECD guideline 203 (Kim et al. 2013). The test was set up as a limit test under static conditions. Fish of the species Oryzias latipes were exposed to a nominal test substance concentration of 100 mg/L. The analytical recovery rate of the test substance was 0.53-2.14 mg/L at 100 mg/L nominal concentration. During the test period of 96 hours mortality and abnormal behavior of the test organisms were examined after 1, 24, 48, 72, and 96 hours. Mortality or adverse effects of the test substance were not observed. Based on the mean measured concentration a LC50(96 h) > 2.14 mg/L (nominal: LC50(96 h) >100 mg/L) was determined.

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 fish.