Registration Dossier
Registration Dossier
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EC number: 913-888-8 | CAS number: -
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
No reliable study with ammonium dihydrogenorthophosphate nor diammonium hydrogenorthophosphate is present. Based on a reliable 72-hours study performed with single superphosphate an EC50 of 1790 mg/l at 20.7°C was determined. As the result, by analogy with superphosphate, reaction mass of ammonium dihydrogenorthophosphate and diammonium hydrogenorthophosphate should not show any adverse effects on daphnids.
Key value for chemical safety assessment
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 1 790 mg/L
Additional information
No reliable study with ammonium dihydrogenorthophosphate nor diammonium hydrogenorthophosphate is present, however one with a substance from the phosphate category is available. In a reliable study performed according to "Standard Methods for the Examination of Water and wastewater (APHA-1975)", Daphnia carinata collected from local ponds were exposed to single superphosphate for 72 hr. Although the recommended exposure time is 48 hr it is not expected to have affected the study as the LC50 values are high. LC50 values after 72 -hours of exposure at both 20.7°C and 30.8°C are 1790 and 1825 mg/L, respectively.
Based on this data on an analogue, the reaction mass of ammonium dihydrogenorthophosphate and diammonium hydrogenorthophosphate should not show any adverse effect on daphnids. 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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