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Diss Factsheets
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EC number: 619-020-1 | CAS number: 94361-06-5
- 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)
Phototransformation in air
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in air
- Type of information:
- calculation (if not (Q)SAR)
- Adequacy of study:
- supporting study
- Study period:
- Not applicable
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- accepted calculation method
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- An estimation of the atmospheric oxidization rate of the test substance was performed using the Atkinson method using the 'Atmospheric Oxidation Program'.
- GLP compliance:
- no
- Remarks:
- Not applicable
- DT50:
- 1 d
- Remarks on result:
- other: OH- radical concentration = 0.5E+06 OH/cm3; 24 hr light/day
- DT50:
- 0.661 d
- Remarks on result:
- other: OH- radical concentration = 1.5E+06 OH/cm3; 12 hr light/day
- Reaction with:
- OH radicals
- Remarks on result:
- other: 1.618E-11 cm3/mol/sec
- Transformation products:
- no
- Remarks:
- M2
- Validity criteria fulfilled:
- not applicable
- Conclusions:
The half-life (Atkinson method) of the test substance in the atmosphere by hydroxyl radical oxidation was estimated to be approximately 1 day assuming the OH radical concentration was 0.5E+06 OH radicals/cm3 and the OH time frame was 24 hours/day. The half-life (Atkinson method) of the test substance in the atmosphere by hydroxyl radical oxidation was estimated to be 0.661 days assuming the OH radical concentration was 1.5E+06 OH radicals/cm3 and the OH time frame was 12 hours/day.- Executive summary:
The rate of photolytic degradation of the test substance in the atmosphere was estimated in the Atmospheric Oxidation Program using the Atkinson method. The overall OH rate constant was calculated to be 1.618E-11 cm3/molecule/sec. The half-life of the test substance in the atmosphere by hydroxyl radical oxidation was estimated to be approximately 1 day assuming the OH radical concentration was 0.5E+06 OH radicals/cm3 and the OH time frame was 24 hours/day. The half-life was estimated to be 0.661 day assuming the OH radical concentration was 1.5E+06 OH radicals/cm3 and the OH time frame was 12 hours/day.
Reference
PHOTOTRANSFORMATION IN AIR RESULTS
The overall bimolecular rate constant determined for OH radicals for the reaction of the test substance with photochemically produced OH radicals was 1.618E-11 cm3/molecule/sec. Addition to aromatic rings was considered the significant contributor to the overall atmospheric degradation pathway. For the EU scenario, the DT50 was determined to be ~1 days (OH- radical concentration = 0.5E+06 OH/cm3; 24 hr light/day).
Table 1. Summary of the OH radical rate parameter and DT50 values conducted under USA and EU regulatory scenarios for the phototransformation of the test substance in the atmosphere.
| US Scenario | EU Scenario |
OH concentration (106 radicals/cm3) | 1.5 | 0.5 |
Time frame (hours per day) | 12 | 24 |
OH rate constant (cm3/molecule/sec) | 1.618E-11 | |
DT50 (days) | 0.66 | ~1 |
Description of key information
Estimated half-life (Atkinson method) = 0.661 day, hydroxyl radical oxidation, 1.5E+06 OH radicals/cm3 and 12 hours/day timeframe, Glänzel 1996.
Estimated half-life (Atkinson method) = 1 day, hydroxyl radical oxidation, 0.5E+06 OH radicals/cm3 and 24 hours/day timeframe, Glänzel 1996.
Half-life in air = 1 day is used in further risk assessment as the OH radical concentration and timeframe follow the recommendations in EU TGD (2003).
Key value for chemical safety assessment
- Half-life in air:
- 1 d
Additional information
One study is available for this endpoint. The rate of photolytic degradation of the test substance in the atmosphere was estimated in the Atmospheric Oxidation Program using the Atkinson method. The overall OH rate constant was calculated to be 1.618E-11 cm3/molecule/sec. The half-life of the test substance in the atmosphere by hydroxyl radical oxidation was estimated to be approximately 1 day assuming the OH radical concentration was 0.5E+06 OH radicals/cm3 and the OH timeframe was 24 hours/day. The half-life was estimated to be 0.661 day assuming the OH radical concentration was 1.5E+06 OH radicals/cm3 and the OH timeframe was 12 hours/day. Half-life of 1 day is used in further risk assessment as the OH radical concentration and timeframe follow the recommendations in the EU TGD (2003).
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.
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