Registration Dossier

Environmental fate & pathways

Phototransformation in air

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

A calculation of the indirect photodegradability of menthols in the atmosphere by hydroxyl radicals according to a structure estimation method revealed a rate constant of 2.4 E -11 cm3/molecule/s (EPI-Suite AOPWIN v. v1.92). Based on an atmospheric concentration of 500,000 OH-radicals/cm3 (REACH Guidance), a half-life of about 16 hours was estimated by the method recommended by REACH guidance.

Key value for chemical safety assessment

Half-life in air:
16 h

Additional information

Because the substance is determined as readily biodegradable, photodegradation is not important to investigate for environmental fate of the substance. However, an estimation of the indirect photodegradability of menthols in the atmosphere by hydroxyl radicals was conducted for the substance. Under the premise of the pseudo-first order reaction with hydroxyl radicals in air, the rate constant of 2.4 E -11 cm3/molecule/s and corresponding half-life 16 hours were calculated.