Registration Dossier
Registration Dossier
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EC number: 913-888-8 | CAS number: -
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
No reliable study with ammonium dihydrogenorthophosphate is available for algae. Based on a reliable study with diammonium hydrogenorthophosphate the EC50 for freshwater algae is >100 mg/L and the NOEC is 100 mg/l. As the result, by analogy with one of its constituents (i.e. DAP), reaction mass of ammonium dihydrogenorthophosphate and diammonium hydrogenorthophosphate should not show any adverse effects on algae.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 100 mg/L
- EC10 or NOEC for freshwater algae:
- 100 mg/L
Additional information
No reliable study with ammonium dihydrogenorthophosphate is available for algae. However, in a OECD 201 guideline study, Selenastrum capricornutum algae were exposed for 72 hrs to 1.56, 3.13, 6.25, 12.5, 25.0, 50.0, and 100 mg/L of diammonium hydrogenorthophosphate under static conditions. Measured concentrations were between 95 and 114% of nominal, therefore the EC50 is expressed as a nominal concentration. No adverse inhibitory toxic effects were observed. There was some growth stimulation at 6.25 mg/L and above. This was consistent with the known stimulatory effect of phosphate compounds.
Based on this data on one of its constituents, the reaction mass of ammonium dihydrogenorthophosphate and diammonium hydrogenorthophosphate should not show any adverse effect on algae. As test items are dissolved in water during aquatic toxicity tests, a similar conclusion can be drawn out for both forms of the reaction mass (i.e. solid and liquid).
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