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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

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Environmental fate & pathways

Phototransformation in air

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Administrative data

Link to relevant study record(s)

Description of key information

- Estimation of the photochemical and oxidative decomposition: DT50 3.969 days = 95.26 hours (based on a 24-hour day; Atkinson method using the programme AOPWIN)
- Measurement of peracetic acid degradation at ambient temperature: DT50 22 min. (Formation of acetic acid)

Key value for chemical safety assessment

Half-life in air:
22 min
Degradation rate constant with OH radicals:
4.022 cm³ molecule-1 s-1

Additional information

According to an estimation of the atmospheric residence time of peracetic acid using the Atkinson method (programme used: AOPWIN; Görg & Glöckner 2007), peracetic acid degrades in the atmosphere with a DT50 of 3.969 days (based on a 24-hour day), corresponding to 95.26 hours. As the molecule does not contain olefin carbon-carbon double or acetylic triple bonds, peracetic acid is not expected to react with ozone.

According to Ancker and Zetterberg (1997), peracetic acid has a DT50 of 22 minutes in the vapour phase (determined in a closed cell under irradiation with infrared light). This value can be taken as the atmospheric half-life for peracetic acid, assuming first-order kinetics.

On a weight of evidence basis, the results on reactivity and the short half-life of 22 minutes suggest, that peracetic acid is not expected to persist in the atmosphere.