Registration Dossier
Registration Dossier
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EC number: 269-789-9 | CAS number: 68333-79-9
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
One key study on an analogous substance exists. This study had been conducted in accordance with a recommended guideline (OECD 209) and under the conditions of GLP. As such, no further testing is considered necessary.
Key value for chemical safety assessment
- EC50 for microorganisms:
- 100 mg/L
Additional information
Under the conditions of this present test, Diammonium hydrogenorthophosphate was not toxic to waste water (activated sludge) bacteria at 100 mg/l. The 3-hour EC50 of Diammonium hydrogenorthophosphate exceeded 100 mg/l (based on nominal concentrations).
Read-across in accordance with Annex XI, Section 1.5 of Regulation (EC) No. 1907/2006 (REACH) is justified on the following basis:
Polyphosphoric acids, ammonium salt (also known as ammonium polyphosphate) is a mixture of oligomeric species of ammonium phosphate. When analysed the substance appears to consist mainly of ammonium orthophosphates, ammonium diphosphate and ammonium triphosphate.
The proposed source chemical (diammonium hydrogenorthophosphate) has the following (EC number 231-987-8) is very soluble in water (> 10000 mg/L). In aqueous media soluble inorganic orthophosphates will dissociate to their ionic constituents; in this case ammonium and orthophosphate ions. The target chemical is also a highly soluble inorganic phosphate (>10000 mg/L). In aqueous media the oligomeric species of ammonium phosphate will dissociate to ammonium cations and pyrophosphate, pyrophosphate and triphosphate anions. The pyrophosphate and triphosphate anions are unstable in aqueous solutions with the degree of instability varying according to pH. In distilled water they will hydrolyse slowly via abiotic mechanisms to orthophosphate. In natural waters a number of different processes can occur; abiotic hydrolysis, biotic degradation (as a result of the action of phosphatases which cleave triphosphates and pyrophosphates into orthophosphate subunits) and assimilation by organisms in the water. Thus the target substance (ammonium polyphosphates) and the source substance (diammonium hydrogenorthophosphate) will be primarily absorbed as the same inorganic ions: ammonium and orthophosphate and are expected to behave in a similar manner under test conditions.
All (bio) transformation products of the source chemical are common to the target chemical and as such the data is considered to be adequate and reliable for use in the assessment of ammonium polyphosphate for the ecotoxicity hazard assessment.
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