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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 (< 0.0001 Pa).

Key value for chemical safety assessment

Additional information

No experimental studies investigating the phototransformation in air of fatty acids, C16-18, 2-octyldodecyl esters (CAS 96690-38-9) 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 the test substance are susceptible to indirect photodegradation in air. The estimated half-life for the reaction with OH-radicals is 7.81 - 8.28 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 fatty acids, C16-18, 2-octyldodecyl esters are not expected to be present in the atmosphere based on the low estimated vapour pressure under ambient conditions (< 0.0001 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, C16-18, 2-octyldodecyl esters.