Registration Dossier

Environmental fate & pathways

Phototransformation in air

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Administrative data

Link to relevant study record(s)

Description of key information

The stability of TMA 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 161.0 hours to 482.9 hours, at different test conditions.The most conservative value was selected.
The overall degradation rate constant with OH radicals is estimated to be equal to 6.89E-08 cm3/(molecule-day).
The stability of TMLA 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 78.6 hours to 235.8 hours, at different test conditions.The most conservative value was selected.
The overall degradation rate constant with OH radicals is estimated to be equal to 1.41E-07 cm3/(molecule-day).

Key value for chemical safety assessment

Half-life in air:
235.8 h
Degradation rate constant with OH radicals:
0 cm³ molecule-1 d-1

Additional information

In the presence of moisture, trimellitic anhydride is rapidly hydrolysed to trimellitic acid and this entity is therefore more relevant to various environmental compartments than the submission substance.