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Environmental fate & pathways

Phototransformation in air

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Description of key information

Phototransformation in air is not relevant based on the low vapour pressure (0.3306 Pa at 25 °C).

Key value for chemical safety assessment

Additional information

No experimental studies investigating the phototransformation in air of triacetin are available. Thus, the phototransformation in air was calculated using AOPWIN v1.92 (Müller, 2013).

The results indicate that triacetin shows a slow degradation by indirect photodegradation in air. The estimated half-life for the reaction with OH-radicals is 45.307 h (24 h day; OH-concentration: 0.5E+06 OH/cm³).However, this is not expected to be a relevant environmental fate process, since triacetin is not expected to be present in the atmosphere based on the low Henry’s Law Constant of < 1 Pa m³/mole and the low vapour pressure of 0.3306 Pa at 25 °C. Based on this result, it can be concluded that phototransformation in air is not a relevant degradation pathway for triacetin.