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Environmental fate & pathways

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Peracetic acid decomposes rapidly in all environmental compartments i.e. air, activated sludge, surface water and soil.

The following processes are involved in the abiotic decomposition/degradation of peracetic acid in the environment:

- Hydrolysis

- Spontaneous decomposition

- Metal (Fe, Cr, Mn) catalysed decomposition

- Oxidation of organic substance


The half-lives of peracetic acid (transferred to 12°C using the Arrhenius equation) that can be used as input parameter for "degradation" in the exposure assessment are as follows:


- Surface water: DT50 of PAA measured: 31.7 hours (20°C); DT50(12°C): 85.6 hours (Reference: IUCLID section 5.1.2 / CSR section Gamet et al. (2000); Klein and Goossens (2007))

- Soil: DT50 of PAA measured: 1 min (*); DT50 (12°C): 2.7 min (Reference: IUCLID section 5.2.3 / CSR section Howarth (2003))

- Air: DT50 of PAA measured: 22 min (*); DT50 (12°C): 59.4 min (Reference: IUCLID section 5.1.1 / CSR section Ancker and Zetterberg (1997))

- STP - aeration tank: DT50 of PAA measured: 3 min (20°C); DT50 (12°C): 5.6 min (Reference: IUCLID section 5.2.1 / CSR section De Groot (2001))

- STP - effluent stream (covering also the sewer system): DT50 of PAA measured: 5 min (20°C); DT50 (12°C): 9.3 min (Reference: IUCLID section 5.2.2 / CSR section Van Egdom (2007))


(*) No temperature was indicated in the reports; a temperature of 25°C was assumed as worst case