Registration Dossier
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EC number: 237-000-7 | CAS number: 13573-12-1
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Key value for chemical safety assessment
Additional information
Data on the acute toxicity of magnesium dimetaphosphate (CAS 13573-12-1) to aquatic algae are not available. The assessment was therefore based on studies conducted with the analogue substance calcium hydrogen orthophosphate (7757-93-9) 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 calcium hydrogen 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 at test start were 0.3, 0.4, 0.3, 0.8, 1.7, and 4.4 mg/L. Based on the algal growth rate an EC50(72 h) >4.4 mg/L (measured) was determined (nominal: EC50(72 h) >100 mg/L). Based on the study results for the read across substance calcium hydrogen orthophosphate the assessed substance magnesium dimetaphosphate is considered not acutely toxic to aquatic algae.
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