Registration Dossier

Environmental fate & pathways

Phototransformation in air

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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.