Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Phototransformation in air

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).

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.

 

Hydrolysis

The substance was highly unstable in water with a half-life in the order of minutes. Instability increased as temperature and pH increased.