Registration Dossier
Registration Dossier
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EC number: 228-601-5 | CAS number: 6303-21-5
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
One key study is available for the sodium phosphinate salt by read across. The hydrolysis of the phosphinate anion was less than 10% after 5 days at 50°C for all tested pHs.
Therefore, the estimated half-life time for phosphinic acid is higher than one year at 25°C.
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 1 yr
- at the temperature of:
- 25 °C
Additional information
One key study is available for the sodium phosphinate salt according to OECD guideline 111 with GLP compliance.
Phosphinic acid is commercially prepared as the result of pH adjustement of the sodium phosphinate. Both are highly soluble in water and release the phosphinate anion. The phosphinate anion is expected to play the most significant role for determining toxicity hence at comparable concentration and defined pH, the phosphinic acid hydrolysis can be read across from the sodium phosphinate salt.
Preliminary study was conducted in duplicate at pH 4.0, 7.0 and 9.0 at a temperature of 50°C. Concentration of the phospinate anion was measured by ion chromatography at the start of the test, after 2.4 h and 120h (5 days) of incubation.
The hydrolysis of the phosphinate anion was less than 10% after 5 days at all pHs and therefore it is considered to be hydrolytically stable, and no further testing was necessary.
The estimated half-life time of phosphinic acid is higher than one year at 25 °C.
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