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Environmental fate & pathways

Phototransformation in air

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Description of key information

Half-life: 2.9 hours (measured) to 55.6 hours (estimated)

Atmospheric OH Rate Constant:

- 2.3 E-12 cm3/molecule-sec (estimated)

- 44.5 E-12 cm3/molecule-sec (measured)

Key value for chemical safety assessment

Half-life in air:
5 d

Additional information

A measured atmospheric OH rate constant of 44.5E-12 cm3/molecule-sec (Blerbach, 1994) and half-life of 2.9 hours (assuming a 12-hr OH radical concentration of 1.5E-6 molecules/cm3) indicates that γ-butyrolactone (GBL) reacts with OH-radicals in the atmosphere and degrades quickly. An estimated atmospheric OH rate constant of 2.3 E-12 cm3/molecule-sec and estimated half-life of 4.5 days (ISP, 2009) indicates that GBL reacts with OH-radicals in the atmosphere and degrades slowly. Irradiation of GBL with the 253.7 nm line of a Hg resonance lamp resulted in the following degradation products: allyl formate, succinaldehyde, cyclopropane, carbon dioxide, carbon monoxide, ethylene, propylene (Simonaitis, 1968).