Registration Dossier
Registration Dossier
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EC number: 200-849-9 | CAS number: 75-21-8
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
In contact with water ethylene oxide will hydrolyse slowly.
Key value for chemical safety assessment
Additional information
Conway and co-workers studied the hydrolysis of ethylene oxide (1983) in sterilized distilled water, in natural river water and salt water. At neutral pH values (7.4) and at 25 °C a half-life of ethylene oxide in distilled water of 12.2 days was determined. In natural river water the half-life was 14.9 d and in 3% salt water the half-life was about 9 d. Ethylene oxide hydrolyses to ethylene glycol.
According to Regulation (EC) 1907/2006, Annex VIII 9.2.2.1, column 2, the study does not need to be conducted if the substance is readily biodegradable.
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