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EC number: 233-069-2 | CAS number: 10028-15-6
- 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
Hydrolysis
Administrative data
Link to relevant study record(s)
- Endpoint:
- hydrolysis
- Data waiving:
- study technically not feasible
- Justification for data waiving:
- other:
- Endpoint:
- hydrolysis
- Remarks:
- No real hydrolysis but self-decomposition in water.
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: other: Peer-reviewed well documented publication
- Reason / purpose for cross-reference:
- reference to same study
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Kinetic studies on ozone decomposition in water were performed over a range of temperatures from 10 to 40 °C and pH range from 2.5 to 9.The ozone decomposition chemical reaction was followed by determining the concentration of dissolved ozone by reaction with a buffered potassium iodide solution, measuring the triiodide ions liberated spectrophotometrically at the wavelength of 352 nm.
- GLP compliance:
- no
- Radiolabelling:
- no
- Analytical monitoring:
- yes
- Details on sampling:
- Not reported.
- Buffers:
- Stock buffered water: Water was first deionized by ion exchange and then distilled.
A mixture of KH2PO4, and Na2HP04 was used to adjust both the ionic strength (0.15) and the pH of the solutions. The ionic strength was kept constant because this parameter affects ozone decomposition (Gurol and Singer, 1982) - Estimation method (if used):
- n.a.
- Details on test conditions:
- - Reactor: The reactor was a 750-cm³ glass vessel with inlets for bubbling, stirring, sampling, venting, and temperature measurement and was submerged in a bath equipped with stirring, heating, and refrigeration systems, which allowed us to keep the temperature constant within ca. 0.5 °C.
- Agitation speed: 100-700 rpm initially, later only 100 rpm.
Procedure: Stock buffered water (500 cm³) was added to the reactor and then ozonated with an 02-03 stream (see above) for 30 min. About this time, saturation of water was reached, and the gas stream was stopped. Subsequently, the ozone decomposition chemical reaction was followed by determining the concentration of dissolved ozone. - Duration:
- 30 min
- pH:
- 2.5
- Temp.:
- 10 °C
- Remarks:
- pH ranged between 2.5 and 9; temnperature range: 10-40 °C
- Number of replicates:
- -
- Positive controls:
- not specified
- Negative controls:
- not specified
- Statistical methods:
- -
- Transformation products:
- yes
- No.:
- #1
- No.:
- #2
- Details on hydrolysis and appearance of transformation product(s):
- At pHs around 9 direct ozone decomposition leads to the formation of hydroxyl radicals (OH·). Hydroxide ion action produces peroxy radicals (HO2·) and hydroxyl radicals.
- Key result
- pH:
- 7
- Temp.:
- 20 °C
- DT50:
- 32 min
- Type:
- not specified
- Validity criteria fulfilled:
- not applicable
- Remarks:
- not to guideline
- Conclusions:
- Ozone is unstable in water. The half-life in deionized and distilled water, at 20°C and pH 7, was calculated to be circa 2000 seconds (ca. 32 min). In any real water (containing ions and other subtsances) the half-life will be much shorter
- Executive summary:
Kinetic studies on ozone decomposition in water were performed over a range of temperatures from 10 to 40 °C and pH range from 2.5 to 9. The ozone decomposition chemical reaction was followed by determining the concentration of dissolved ozone. Ozone decomposition was observed to follow a two-term rate equation supported by a reaction mechanism. The results indicated that at a pH of 7, increasing temperatures result in more rapid ozone decomposition, and that at a constant temperature of 30 °C, as pH becomes more alkaline the ozone decomposition rate increases. Overall, ozone is unstable in water. The half-life in deionized and distilled water, at 20°C and pH 7, was calculated to be circa 2000 seconds (ca. 32 min). In any real water (containing ions and other subtsances) the half-life will be much shorter.
It was shown that at pHs lower than 7, whatever the temperature was, direct ozone decomposition and the initiation step involving the hydroxyl radicals are the main cause of ozone decomposition. At higher pHs, the importance of the peroxy radicals and of the hydroxide ion initiation step increases. Thus, at pHs around 9, the ozone decomposition rate depends on two major contributions: direct ozone decomposition, which leads to the formation of hydroxyl radicals, OH·, and hydroxide ion action, which produces not only peroxy radicals, HO2·, but also hydroxyl radicals. Finally, the nature of the ionic species (carbonate, sulfate, phosphate, etc.) present in the water greatly influences ozone decomposition, inhibiting some of the reactions in the mechanism proposed.
Referenceopen allclose all
Included below are Figures 2 and 3 which illustrate the time taken for degradation of ozone at a range of pHs and temperatures. The specific numerical values are not provided in the report, however the results indicate that at a pH of 7, increasing temperatures result in more rapid ozone decomposition, and that at a constant temperature of 30 °C, as pH becomes more alkaline the ozone decomposition rate increases.
Description of key information
Although ozone has no hydrolysable groups in its chemical structure and is therefore considered not to be prone to hydrolysis, it self-decomposes rapidly in water with a half-life of 32 min. For details on ozone self-decomposition in water please refer to IUCLID section 5.6.
Key value for chemical safety assessment
- Half-life for hydrolysis:
- 32 min
- at the temperature of:
- 20 °C
Additional information
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