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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 (0.0095 Pa).

Key value for chemical safety assessment

Additional information

No experimental studies investigating the phototransformation in air of isononanoic acid, C16-18 alkyl esters (CAS 111937-03-2) are available. As this substance is composed of different homologues, phototransformation in air was calculated for the representative components using AOPWIN v1.92 (Müller, 2011). The results indicate that the components of isononanoic acid, C16-18 alkyl esters are susceptible to indirect photodegradation in air. The estimated half-life for the reaction with OH-radicals is 13.20 - 14.61 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 isononanoic acid, C16-18 alkyl esters are not expected to be present in the atmosphere based on the low estimated vapour pressure under ambient conditions (0.0095 Pa at 20 °C). As this study is not a standard information requirement according to Regulation (EC) No 1907/2006 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 isononanoic acid, C16-18 alkyl esters.