Registration Dossier
Registration Dossier
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EC number: 231-987-8 | CAS number: 7783-28-0
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
Based on a reliable study, the EC50 for freshwater algae is >100 mg/L and the NOEC is 100 mg/L.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 100 mg/L
- EC10 or NOEC for freshwater algae:
- 100 mg/L
Additional information
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 (DAP) under static conditions.
Measured DAP concentrations were 95-114% of nominal at the beginning of the test period. The measured concentrations decreased during the exposure period (43-86% of nominal) which was likely due to incorporation of the phosphate into the algal biomass rather than instability of the test substance. Therefore, effect values were determined based on initial concentrations. Results are expressed as nominal initial concentrations as the recovery of these concentrations was >80%.
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.
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