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Environmental fate & pathways

Phototransformation in air

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Description of key information

Monopropylene glycol undergoes reactions with hydroxyl radicals in the atmosphere. The half life of monopropylene glycol due to this reaction, based on a 12-hr day with an OH radical concentration of 1.5E06 OH/cm3 is 0.83 days. The overall rate constant is 12.82 E-12 cm3/molecule-sec.

Key value for chemical safety assessment

Additional information

The calculated half life of monopropylene glycol is 0.83 days with an OH radical concentration of 1.5E06 OH/cm3 (Aopwin, 2000). No reaction of monopropylene glycol with ozone or other atoms were calculated. Overall, monopropylene glycol is rapidly degraded in the atmosphere.