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EC number: 246-644-8 | CAS number: 25134-21-8
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
The stability of METH in the atmosphere was calculated using the software AOPWIN (v1.92). It is predicted that the substance will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals, with a half-life ranged from 4.24 and 6.52 hours.
The overall degradation rate constant with OH radicals is estimated ranged from 5.11E-6 to 7.84E-6 cm3/(molecule-day).
The stability of METHAc in the atmosphere was calculated using the software AOPWIN (v1.92). It is predicted that the substance will be degraded in the atmosphere by reaction with photochemically-produced hydroxyl radicals, with a half-life ranged from 4.10 to 6.19 hours.
The overall degradation rate constant with OH radicals is estimated ranged from 5.37E-6 to 8.11E-6 cm3/(molecule-day).
Key value for chemical safety assessment
- Half-life in air:
- 6.19 h
- Degradation rate constant with OH radicals:
- 0 cm³ molecule-1 d-1
Additional information
In the presence of moisture, 1,2,3,6-tetrahydromethyl-3,6-methanophthalic anhydride (5 METH, 4-METH) rapidly hydrolyse to methylbicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid (5-METHAc, 4-METHAc) and this entity is therefore more relevant to various environmental compartments than the submission substance.
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