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Environmental fate & pathways

Phototransformation in air

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Description of key information

Ethanone, 1-(2-hydroxy-5-nonylphenyl)-, oxime, branched is susceptible to indirect photodegradation in air. However, phototransformation in air is not considered to be relevant due to the low vapour pressure (< 1.5 Pa at 20 °C).

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Additional information

No experimental studies investigating the phototransformation in air of Ethanone, 1-(2-hydroxy-5-nonylphenyl)-, oxime, branched (CAS 244235-47-0) are available. Thus, phototransformation in air was calculated for the substance to register and the relevant impurity Phenol, 4-nonyl-, branched (CAS 84852-15-3) using AOPWIN v1.92 (BASF, 2014). The results indicate that Ethanone, 1-(2-hydroxy-5-nonylphenyl)-, oxime, branched as well as Phenol, 4-nonyl-, branched are susceptible to indirect photodegradation in air. The estimated half-life for the reaction with OH-radicals is 6.42 h and 7.48 h, respectively (24 h day; OH-concentration: 0.5E+06 OH/cm³).

However, this environmental fate process is considered to be negligible, since the test substance is not expected to be present in the atmosphere to a significant degree based on its relatively low vapour pressure under ambient conditions (< 1.5 Pa at 20 °C). Vapour pressures of branched nonylphenol components were determined to be comparably low (e.g., ~ 0.1 Pa by Bidleman and Renberg 1985). 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 Ethanone, 1-(2-hydroxy-5-nonylphenyl)-, oxime, branched.