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EC number: 273-265-5 | CAS number: 68955-28-2 A complex combination of hydrocarbons produced by the distillation of products from a thermal cracking process. It consists of hydrocarbons having a carbon number predominantly of C4.
- 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
Phototransformation in air
Administrative data
Link to relevant study record(s)
- Endpoint:
- phototransformation in air
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Non-GLP, non guideline, published in peer reviewed literature, acceptable with restrictions
- Principles of method if other than guideline:
- Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. The author applied a least squares analysis of degradation rate constants to calculate a preferred value.
- GLP compliance:
- no
- Remarks:
- No data reported
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
No data reported - Estimation method (if used):
- No data reported
- Light source:
- not specified
- Details on light source:
- No data reported
- Details on test conditions:
- No data reported
- Preliminary study:
- No data reported
- Test performance:
- No data reported
- DT50:
- 0.24 d
- Test condition:
- Based on a rate constant of 6.68E-11 cm3 molecule-1sec-1 with OH radicals
- Results with reference substance:
- No data reported
- Conclusions:
- The estimated half life of the constituent is 0.24 days based on a recommended reaction rate with hydroxyl radicals and the concentration of hydroxyl radicals recommended in the Technical Guidance Document (2003).
- Executive summary:
Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. Therefore, this value represents a valid rate constant for 1,3-butadiene based on all valid studies at the time of publication.
- Endpoint:
- phototransformation in air
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Non-GLP, information from a review article, acceptable with restrictions
- Principles of method if other than guideline:
- Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. The author applied a least squares analysis of degradation rate constants for organic chemicals by hydroxyl radicals developed by other investigators.
- GLP compliance:
- not specified
- Remarks:
- No data reported
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
No data reported - Estimation method (if used):
- No data reported
- Light source:
- other: No data reported
- Details on light source:
- No data reported
- Details on test conditions:
- No data reported
- Preliminary study:
- No data reported
- Test performance:
- No data reported
- DT50:
- 0.5 d
- Test condition:
- No further details
- Results with reference substance:
- No data reported
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Review article
- Conclusions:
- The half-life of the constituent is 0.5 days
- Executive summary:
The half-life of But-1 -ene is 0.5 days. Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. Therefore, this value represents a valid rate constant for But-1-ene based on all valid studies at the time of publication.
- Endpoint:
- phototransformation in air
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Non-GLP, information from a review article, acceptable with restrictions
- Principles of method if other than guideline:
- Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. The author applied a least squares analysis of degradation rate constants for organic chemicals by hydroxyl radicals developed by other investigators.
- GLP compliance:
- not specified
- Remarks:
- No data reported
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
No data reported - Estimation method (if used):
- No data reported
- Light source:
- other: No data reported
- Details on light source:
- No data reported
- Details on test conditions:
- No data reported
- Preliminary study:
- No data reported
- Test performance:
- No data reported
- DT50:
- 0.31 d
- Test condition:
- No further details
- Results with reference substance:
- No data reported
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Review article
- Conclusions:
- The half-life of the constituent is 0.31 days.
- Executive summary:
The half-life of Prop-1 -ene, 2 -methyl- is 0.31 days. Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. Therefore, this value represents a valid rate constant for Prop-1 -ene, 2 -methyl- based on all valid studies at the time of publication.
- Endpoint:
- phototransformation in air
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Non-GLP, information from a review article, acceptable with restrictions
- Principles of method if other than guideline:
- Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. The author applied a least squares analysis of degradation rate constants for organic chemicals by hydroxyl radicals developed by other investigators.
- GLP compliance:
- not specified
- Remarks:
- No data reported
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
No data reported - Estimation method (if used):
- No data reported
- Light source:
- other: No data reported
- Details on light source:
- No data reported
- Details on test conditions:
- No data reported
- Preliminary study:
- No data reported
- Test performance:
- No data reported
- DT50:
- 6.3 d
- Test condition:
- No further details
- Results with reference substance:
- No data reported
- Validity criteria fulfilled:
- not applicable
- Remarks:
- Review article
- Conclusions:
- The half-life of the constituent is 6.3 days.
- Executive summary:
The half-life of Butane is 6.3 days. Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. Therefore, this value represents a valid rate constant for butane based on all valid studies at the time of publication.
- Endpoint:
- phototransformation in air
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Non-GLP, non guideline, published in peer reviewed literature, acceptable with restrictions
- Principles of method if other than guideline:
- Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. The author applied a least squares analysis of degradation rate constants to calculate a preferred value.
- GLP compliance:
- no
- Remarks:
- No data reported
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
No data reported - Estimation method (if used):
- No data reported
- Light source:
- not specified
- Details on light source:
- No data reported
- Details on test conditions:
- No data reported
- Preliminary study:
- No data reported
- Test performance:
- No data reported
- DT50:
- 3.2 d
- Test condition:
- Based on a rate constant of 1E-13 cm3 molecule-1sec-1 with NO3
- Results with reference substance:
- No data reported
- Conclusions:
- The estimated half life of 1,3-butadiene is 3.2 days based on a recommended reaction rate with NO3 and the concentration of NO3 of 2.5E7 molecules/cm3 in clean air (as used in the EU RAR).
- Executive summary:
Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. Therefore, this value represents a valid rate constant for 1,3-butadiene based on all valid studies at the time of publication. The half life is longer than that reported in the EU RAR for buta-1,3 -diene as a more recent review was available by Atkinson that derived an updated rate constant.
- Endpoint:
- phototransformation in air
- Type of information:
- experimental study
- Adequacy of study:
- supporting study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- other: Non-GLP, non guideline, published in peer reviewed literature, acceptable with restrictions
- Principles of method if other than guideline:
- Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals.
- GLP compliance:
- no
- Remarks:
- No data reported
- Specific details on test material used for the study:
- Details on properties of test surrogate or analogue material:
No data reported - Estimation method (if used):
- No data reported
- Light source:
- not specified
- Details on light source:
- No data reported
- Details on test conditions:
- No data reported
- Preliminary study:
- No data reported
- Test performance:
- No data reported
- DT50:
- 2 d
- Test condition:
- Based on a rate constant of 8.1E-18 cm3 molecule-1sec-1 with ozone
- Results with reference substance:
- No data reported
- Conclusions:
- The estimated half life of 1,3-butadiene is 2 days based on a recommended reaction rate with ozone and the concentration of ozone recommended by Howard et al (1991). Handbook of environmental degradation rates. Lewis Publishers Inc. for clean air.
- Executive summary:
Measured data from author and other investigators were quality assessed and then used to develop rate constants for different chemicals. Therefore, this value represents a valid rate constant for 1,3-butadiene based on all valid studies at the time of publication.
Referenceopen allclose all
Author reports a recommended rate constant of 6.68E-11 cm3 molecule-1sec-1. Half life is calculated based on this rate constant and a hydroxyl radical concentration of 5E5 molecule.cm-3
Based on a calculated rate constant of 3.14E-11 cm3molecule-1sec-1, and a hydroxyl radical concentration of 5E5 molecule.cm-3.
Based on a calculated rate constant of 5.14E-11 cm3molecule-1sec-1, and a hydroxyl radical concentration of 5E5 molecule.cm-3.
Based on a calculated rate constant of 2.53-12 cm3molecule-1sec-1, and a hydroxyl radical concentration of 5E5 molecule.cm-3.
Author reports a recommended rate constant of 1E-13 cm3 molecule-1sec-1. Half life is calculated based on this rate constant and a NO3 concentration of 2.5E7 molecule.cm-3
Author reports a recommended rate constant of 8.1E-18 cm3 molecule-1sec-1. Half life is calculated based on this rate constant and a ozone concentration of 5E11 molecule.cm-3
Description of key information
The members of this category are gases at standard temperature and pressure and will predominantly partition to the atmosphere.
The representative constituents of the category studied and used as supporting read-across are Butane (CAS 106-97-8), But-1-ene (CAS 106-98-9), Buta-1,3-diene (CAS 106-99-0) and Prop-1-ene, 2-methyl- (CAS 115-11-7).
The results showed rate constants of the reaction of OH radicals to range from 2.53 E-12 cm3/mol/s to 6.68E-11cm3/mol/s, whereas the atmospheric half-life from 0.24 to 6.3 days. Therefore, the members of this category would not be persistent in the atmospheric compartment. All information came from Atkinson (1985), which is a review article with no data reported on the test methods or conditions of the original data source. Nevertheless, the data are taken from a published, peer-reviewed journal article and are considered to be suitable for this endpoint.
Key value for chemical safety assessment
Additional information
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