Registration Dossier
Registration Dossier
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EC number: 203-714-2 | CAS number: 109-87-5
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
When biodegradation of methylal is observed, this phenomenon is very weak and observed at low concentration (0.1%). However, due to its high volatility (VP of 40 000 Pa), biodegradation of methylal has to be fast to be effective. Adaptation of micoorganisms to methylal is possible but is random and can disappear quickly.
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
FUL (1991) stated that methylal at 0.1 mL/L is responsible for a negative inhibition (-4.87 %) that corresponds to a positive biodegradability. Methylal was not biodegraded at higher concentrations.
Paul & Demanze (199 ) reported a DOC/BOD5 ratio for methylal at 0.1% is 210 meaning that methylal ready biodegradability is very low.
Culot & Fievez (1998) stated that methylal is not degraded at 0.1, 1, 5, 10, 20 and 30 g/L.
Methylal did not produced biogas in anaerobic conditions at 6.25 and 12.5 g/L meaning that it is not biodegraded (Culot, 1998).
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