Registration Dossier
Registration Dossier
Data platform availability banner - registered substances factsheets
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Diss Factsheets
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 201-186-8 | CAS number: 79-21-0
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
- Boiling point
- Density
- Particle size distribution (Granulometry)
- Vapour pressure
- Partition coefficient
- Water solubility
- Solubility in organic solvents / fat solubility
- Surface tension
- Flash point
- Auto flammability
- Flammability
- Explosiveness
- Oxidising properties
- Oxidation reduction potential
- Stability in organic solvents and identity of relevant degradation products
- Storage stability and reactivity towards container material
- Stability: thermal, sunlight, metals
- pH
- Dissociation constant
- Viscosity
- Additional physico-chemical information
- Additional physico-chemical properties of nanomaterials
- Nanomaterial agglomeration / aggregation
- Nanomaterial crystalline phase
- Nanomaterial crystallite and grain size
- Nanomaterial aspect ratio / shape
- Nanomaterial specific surface area
- Nanomaterial Zeta potential
- Nanomaterial surface chemistry
- Nanomaterial dustiness
- Nanomaterial porosity
- Nanomaterial pour density
- Nanomaterial photocatalytic activity
- Nanomaterial radical formation potential
- Nanomaterial catalytic activity
- Endpoint summary
- Stability
- Biodegradation
- Bioaccumulation
- Transport and distribution
- Environmental data
- Additional information on environmental fate and behaviour
- Ecotoxicological Summary
- Aquatic toxicity
- Endpoint summary
- Short-term toxicity to fish
- Long-term toxicity to fish
- Short-term toxicity to aquatic invertebrates
- Long-term toxicity to aquatic invertebrates
- Toxicity to aquatic algae and cyanobacteria
- Toxicity to aquatic plants other than algae
- Toxicity to microorganisms
- Endocrine disrupter testing in aquatic vertebrates – in vivo
- Toxicity to other aquatic organisms
- Sediment toxicity
- Terrestrial toxicity
- Biological effects monitoring
- Biotransformation and kinetics
- Additional ecotoxological information
- Toxicological Summary
- Toxicokinetics, metabolism and distribution
- Acute Toxicity
- Irritation / corrosion
- Sensitisation
- Repeated dose toxicity
- Genetic toxicity
- Carcinogenicity
- Toxicity to reproduction
- Specific investigations
- Exposure related observations in humans
- Toxic effects on livestock and pets
- Additional toxicological data
![](https://echa.europa.eu/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/print_environmental-fate-and-pathways.png)
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
Degradation half-life values: (0.001 mol/L = 95 mg/L; 25 °C): 48 or 46.7 (pH 4), 48 or 31.7 (pH 7) and 3.6 hours (pH 9)
Between pH 5.5 and 8.2, hydrolysis is negligible and peracetic acid degradation is mainly due to spontaneous decomposition (maximum at pH 8.2, which is equivalent to the pKa of peracetic acid). Between pH 8.2 and 9.0, the peracetic acid consumption is due to spontaneous decomposition and hydrolysis. Above pH 10.5, spontaneous decomposition is negligible and hydrolysis becomes dominant.
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 31.7 h
- at the temperature of:
- 25 °C
Additional information
Hydrolysis of peracetic acid is strongly pH-dependent, which was found in the study on abiotic degradation according to EU method C.7, where degradation half-life values for peracetic acid (0.001 mol/L) were 48, 48 and 3.6 hours at temperature of 25 °C and at pH of 4, 7 and 9, respectively, assuming a pseudo-first order kinetics. Additional performed recalculation using the First Order Multi-Compartment model revealed even lower values (46.7, 31.7 h at pH 4 and 7, respectively; insufficient data points at pH 9). The study indicates that peracetic acid is rapidly degraded in the environment and that decomposition is faster at low concentrations and high pH values.
In a study by Yuan (1997), hydrolysis of peracetic acid is found to be negligible between pH 5.5 and 8.2 where it mainly decomposes spontaneously (maximum at pH 8.2, equivalent to the pKa of peracetic acid). Between pH 8.2 and 9.0, the peracetic acid degradation is due to spontaneous decomposition and hydrolysis. Above pH 10.5, spontaneous decomposition is negligible and hydrolysis becomes dominant.
Other available data showed comparable values and a strong pH and concentration-dependency for the degradation of peracetic acid (Anonymous, 1995).
As a conclusion, the DT50 of 31.7 h at pH 7 determined for the peracetic acid concentration of 95 ppm, was selected as input parameter for the environmental exposure assessment (degradation in surface water).
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
![ECHA](/o/diss-blank-theme/images/factsheets/A-REACH/factsheet/echa_logo.png)