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EC number: 201-186-8 | CAS number: 79-21-0
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:
- 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 184.108.40.206: Gamet et al. (2000); Klein and Goossens (2007))
DT50 of PAA measured: 1 min (*); DT50 (12°C): 2.7 min (Reference: IUCLID section 5.2.3 / CSR section 220.127.116.11: Howarth (2003))
DT50 of PAA measured: 22 min (*); DT50 (12°C): 59.4 min (Reference: IUCLID section 5.1.1 / CSR section 18.104.22.168.1: 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 22.214.171.124.2: 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 126.96.36.199.3: Van Egdom (2007))
(*) No temperature was indicated in the reports; a temperature of 25°C was assumed as worst case
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