Registration Dossier
Registration Dossier
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EC number: 233-046-7 | CAS number: 10025-87-3
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
The halflife of phosphoryl trichloride in water at 23 °C is estimated to be less than 10 seconds.
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 10 s
- at the temperature of:
- 23 °C
Additional information
In water, phosphoryl trichloride hydrolyses to phosphoric acid and hydrochloric acid with t1/2 < 10 seconds (Hansel, 2004). Since hydrochloric acid is the major product formed in the ratio of 3:1 and it is the much stronger acid then all effects on pH are mainly caused by hydrochloric acid. Phosphoryl trichloride itself is not likely to result in environmental effects. For assessment of the environmental effects the focus should be on the major hydrolysis product, hydrochloric acid.
The kinetics of phosphoryl trichloride hydrolysis was measured in dioxane solution containing 33 % water (Hudson and Mitchell, 1962). Initial hydrolysis of phosphoryl trichloride proceeds with a half life of ca. 0.01 seconds to phosphorodichloric acid and hydrochloric acid. The hydrolysis of phosphorodichloric is less rapid to give phosphoric acid. In a separate experiment, half life for the hydrolysis of phosphorodichloric acid was measured to be 250 seconds.
Rodriguez and Castro (1942) measured the hydrolysis rate constant, which had an average value of 45 s-1 at 20 °C and 89 s-1 at 35 °C.
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