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Environmental fate & pathways

Phototransformation in air

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Description of key information

Phototransformation in air is not relevant due to low vapour pressure (< 1E-10 Pa).

Key value for chemical safety assessment

Additional information

No experimental studies investigating the phototransformation in air of fatty acids, C14-18 and C16-18-unsatd., esters with propylene glycol (CAS 84988-75-0) are available. Because the substance is a composition of different homologues, the phototransformation in air was calculated for representative components using AOPWIN v1.92 (Müller, 2011).

The results indicate that the components of fatty acids, C14-18 and C16-18-unsatd., esters with propylene glycol are susceptible to indirect photodegradation in air. The estimated half-life for the reaction with OH-radicals is 2.28 - 10.49 h (24 h day; OH-concentration: 0.5E+06 OH/cm³). However, this is not expected to be a relevant environmental fate process, since the components of fatty acids, C14-18 and C16-18-unsatd., esters with propylene glycol are not expected to be present in the atmosphere based on the low estimated vapour pressure under ambient conditions (< 1E-10 Pa at 20 °C). As this study is not a standard information requirement in REACh and there is no indication from the Chemical Safety Assessment (CSA) on the need to investigate further the fate and behaviour of the substance (Annex X requirement), no further testing is considered necessary for fatty acids, C14-18 and C16-18-unsatd., esters with propylene glycol.