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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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
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EC number: 206-114-9 | CAS number: 302-01-2
- 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: Basic data are given.
- Principles of method if other than guideline:
- The OH concentration was monitored as a function of time comparing the behaviour in the absence and presence of the test substance
- GLP compliance:
- not specified
- Details on test conditions:
- Sensitiser (for indirect photolysis): OH
Sensitiser concentration: smaller or equal than 1*E11 molecule/cm³ - DT50:
- 6.3 h
- Test condition:
- OH concentration of 500000 molecules/cm³; rate constant 6.1 E-11 cm³/(molecule * s) (T= 298 - 424 K)
- Executive summary:
Hydrazine is rapidly degraded under the presence of hydroxyl radicals yielding a temperature independent rate constante of 6.1 E-11 cm³/(molecule * s) (T= 298 - 424 K) (Pitts et al., 1980). Based on these results an atmospheric half life of 6.3 h can be calculated assuming an OH concentration of 500000 molecules/cm³.
Reference
- rate constants at different temperatures were reported as well:
298 K: 6.5*E11 cm³/(molecule * s)
355 K: 5.9*E11 cm³/(molecule * s)
424 K: 5.8*E11 cm³/(molecule * s)
Description of key information
Hydrazine is rapidly degraded under the presence of hydroxyl radicals yielding a temperature independent rate constant of 6.1 E-11 cm³/(molecule * s) (T= 298 - 424 K) (Pitts et al., 1980). An atmospheric half life of 6.3 h can be calculated based on the derived rate constant and an assumed OH concentration of 500000 molecules/cm³ indicating only a limited potential for a long range atmospheric transport.
Key value for chemical safety assessment
- Half-life in air:
- 6.3 h
- Degradation rate constant with OH radicals:
- 0 cm³ molecule-1 s-1
Additional information
According to the guidance document R.11 (ECHA, 2008, p19), substances with an atmospheric half-life < 2 days are not expected to stay in the atmosphere for long as they will degrade rapidly. Concludingly, there will be a limited potential for long range atmospheric transport when discussing the behaviour of hydrazine.
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.
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